refactor: Enable partial transcription with a latency of 1000ms (#141)

* refactor: Enable partial transcription with a latency of 1000ms * refactor: Update CMakePresets.json and buildspec.json - Remove the "QT_VERSION" variable from CMakePresets.json for all platforms - Update the "version" of "obs-studio" and "prebuilt" dependencies in buildspec.json - Update the "version" of "qt6" dependency in buildspec.json - Update the "version" of the project to "0.3.3" in buildspec.json - Update the "version" of the project to "0.3.3" in CMakePresets.json - Remove unused code in whisper-processing.cpp * refactor: Add -Wno-error=deprecated-declarations option to compilerconfig.cmake * refactor: Update language codes in translation module
2026-01-09 12:28:05 -05:00 · 2024-07-19 14:02:24 -04:00
parent 19017ca17f
commit b3e4bfa33a
16 changed files with 305 additions and 222 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -16,7 +16,6 @@
 !LICENSE
 !README.md
 !/vendor
-!patch_libobs.diff

 # Exclude lock files
 *.lock.json
--- a/CMakePresets.json
+++ b/CMakePresets.json
@@ -28,7 +28,6 @@
      "generator": "Xcode",
      "warnings": {"dev": true, "deprecated": true},
      "cacheVariables": {
-        "QT_VERSION": "6",
        "CMAKE_OSX_DEPLOYMENT_TARGET": "11.0",
        "CODESIGN_IDENTITY": "$penv{CODESIGN_IDENT}",
        "CODESIGN_TEAM": "$penv{CODESIGN_TEAM}"
@@ -59,7 +58,6 @@
      "architecture": "x64",
      "warnings": {"dev": true, "deprecated": true},
      "cacheVariables": {
-        "QT_VERSION": "6",
        "CMAKE_SYSTEM_VERSION": "10.0.18363.657"
      }
    },
@@ -86,7 +84,6 @@
      "generator": "Ninja",
      "warnings": {"dev": true, "deprecated": true},
      "cacheVariables": {
-        "QT_VERSION": "6",
        "CMAKE_BUILD_TYPE": "RelWithDebInfo"
      }
    },
@@ -114,7 +111,6 @@
      "generator": "Ninja",
      "warnings": {"dev": true, "deprecated": true},
      "cacheVariables": {
-        "QT_VERSION": "6",
        "CMAKE_BUILD_TYPE": "RelWithDebInfo"
      }
    },
--- a/README.md
+++ b/README.md
@@ -12,12 +12,13 @@

 ## Introduction

-LocalVocal live-streaming AI assistant plugin allows you to transcribe, locally on your machine, audio speech into text and perform various language processing functions on the text using AI / LLMs (Large Language Models). ✅ No GPU required, ✅ no cloud costs, ✅ no network and ✅ no downtime! Privacy first - all data stays on your machine.
+LocalVocal lets you transcribe, locally on your machine, speech into text and simultaneously translate to any language. ✅ No GPU required, ✅ no cloud costs, ✅ no network and ✅ no downtime! Privacy first - all data stays on your machine.

-If this free plugin has been valuable to you consider adding a ⭐ to this GH repo, rating it [on OBS](https://obsproject.com/forum/resources/localvocal-live-stream-ai-assistant.1769/), subscribing to [my YouTube channel](https://www.youtube.com/@royshilk) where I post updates, and supporting my work on [GitHub](https://github.com/sponsors/royshil) or [Patreon](https://www.patreon.com/RoyShilkrot) 🙏
+If this free plugin has been valuable consider adding a ⭐ to this GH repo, rating it [on OBS](https://obsproject.com/forum/resources/localvocal-live-stream-ai-assistant.1769/), subscribing to [my YouTube channel](https://www.youtube.com/@royshilk) where I post updates, and supporting my work on [GitHub](https://github.com/sponsors/royshil), [Patreon](https://www.patreon.com/RoyShilkrot) or [OpenCollective](https://opencollective.com/occ-ai) 🙏

-Internally the plugin is running a neural network ([OpenAI Whisper](https://github.com/openai/whisper)) locally to predict in real time the speech and provide captions.
+Internally the plugin is running [OpenAI's Whisper](https://github.com/openai/whisper) to process real-time the speech and predict a transcription.
 It's using the [Whisper.cpp](https://github.com/ggerganov/whisper.cpp) project from [ggerganov](https://github.com/ggerganov) to run the Whisper network efficiently on CPUs and GPUs.
+Translation is done with [CTranslate2](https://github.com/OpenNMT/CTranslate2).

 ## Usage

@@ -45,9 +46,10 @@ Current Features:
 - Sync'ed captions with OBS recording timestamps
 - Send captions on a RTMP stream to e.g. YouTube, Twitch
 - Bring your own Whisper model (any GGML)
- Translate captions in real time to major languages (both Whisper built-in translation as well as NMT models with [CTranslate2](https://github.com/OpenNMT/CTranslate2))
+- Translate captions in real time to major languages (both Whisper built-in translation as well as NMT models)
 - CUDA, OpenCL, Apple Arm64, AVX & SSE acceleration support
 - Filter out or replace any part of the produced captions
+- Partial transcriptions for a streaming-captions experience

 Roadmap:
 - More robust built-in translation options
@@ -57,18 +59,18 @@ Roadmap:
 Check out our other plugins:
 - [Background Removal](https://github.com/occ-ai/obs-backgroundremoval) removes background from webcam without a green screen.
 - [Detect](https://github.com/occ-ai/obs-detect) will detect and track >80 types of objects in real-time inside OBS
- [CleanStream](https://github.com/occ-ai/obs-cleanstream) for real-time filler word (uh,um) and profanity removal from live audio stream
+- [CleanStream](https://github.com/occ-ai/obs-cleanstream) for real-time filler word (uh,um) and profanity removal from a live audio stream
 - [URL/API Source](https://github.com/occ-ai/obs-urlsource) that allows fetching live data from an API and displaying it in OBS.
- [Polyglot](https://github.com/occ-ai/obs-polyglot) translation AI plugin for real-time, local translation to hunderds of languages
+- [Squawk](https://github.com/occ-ai/obs-squawk) adds lifelike local text-to-speech capabilities built-in OBS

 ## Download
 Check out the [latest releases](https://github.com/occ-ai/obs-localvocal/releases) for downloads and install instructions.

 ### Models
-The plugin ships with the Tiny.en model, and will autonomoously download other bigger Whisper models through a dropdown.
-However there's an option to select an external model file if you have it on disk.
+The plugin ships with the Tiny.en model, and will autonomously download other Whisper models through a dropdown.
+There's also an option to select an external GGML Whisper model file if you have it on disk.

-Get more models from https://ggml.ggerganov.com/ and follow [the instructions on whisper.cpp](https://github.com/ggerganov/whisper.cpp/tree/master/models) to create your own models or download others such as distilled models.
+Get more models from https://ggml.ggerganov.com/ and [HuggingFace](https://huggingface.co/ggerganov/whisper.cpp/tree/main), follow [the instructions on whisper.cpp](https://github.com/ggerganov/whisper.cpp/tree/master/models) to create your own models or download others such as distilled models.

 ## Building

@@ -172,7 +174,7 @@ The build should exist in the `./release` folder off the root. You can manually

 LocalVocal will now build with CUDA support automatically through a prebuilt binary of Whisper.cpp from https://github.com/occ-ai/occ-ai-dep-whispercpp. The CMake scripts will download all necessary files.

-To build with cuda add `CPU_OR_CUDA` as an environment variable (with `cpu`, `12.2.0` or `11.8.0`) and build regularly
+To build with cuda add `CPU_OR_CUDA` as an environment variable (with `cpu`, `clblast`, `12.2.0` or `11.8.0`) and build regularly

 ```powershell
 > $env:CPU_OR_CUDA="12.2.0"
--- a/buildspec.json
+++ b/buildspec.json
@@ -1,33 +1,33 @@
 {
    "dependencies": {
        "obs-studio": {
-            "version": "30.0.2",
+            "version": "30.1.2",
            "baseUrl": "https://github.com/obsproject/obs-studio/archive/refs/tags",
            "label": "OBS sources",
            "hashes": {
-                "macos": "be12c3ad0a85713750d8325e4b1db75086223402d7080d0e3c2833d7c5e83c27",
-                "windows-x64": "970058c49322cfa9cd6d620abb393fed89743ba7e74bd9dbb6ebe0ea8141d9c7"
+                "macos": "490bae1c392b3b344b0270afd8cb887da4bc50bd92c0c426e96713c1ccb9701a",
+                "windows-x64": "c2dd03fa7fd01fad5beafce8f7156da11f9ed9a588373fd40b44a06f4c03b867"
            }
        },
        "prebuilt": {
-            "version": "2023-11-03",
+            "version": "2024-03-19",
            "baseUrl": "https://github.com/obsproject/obs-deps/releases/download",
            "label": "Pre-Built obs-deps",
            "hashes": {
-                "macos": "90c2fc069847ec2768dcc867c1c63b112c615ed845a907dc44acab7a97181974",
-                "windows-x64": "d0825a6fb65822c993a3059edfba70d72d2e632ef74893588cf12b1f0d329ce6"
+                "macos": "2e9bfb55a5e0e4c1086fa1fda4cf268debfead473089df2aaea80e1c7a3ca7ff",
+                "windows-x64": "6e86068371526a967e805f6f9903f9407adb683c21820db5f07da8f30d11e998"
            }
        },
        "qt6": {
-            "version": "2023-11-03",
+            "version": "2024-03-19",
            "baseUrl": "https://github.com/obsproject/obs-deps/releases/download",
            "label": "Pre-Built Qt6",
            "hashes": {
-                "macos": "ba4a7152848da0053f63427a2a2cb0a199af3992997c0db08564df6f48c9db98",
-                "windows-x64": "bc57dedf76b47119a6dce0435a2f21b35b08c8f2948b1cb34a157320f77732d1"
+                "macos": "694f1e639c017e3b1f456f735330dc5afae287cbea85757101af1368de3142c8",
+                "windows-x64": "72d1df34a0ef7413a681d5fcc88cae81da60adc03dcd23ef17862ab170bcc0dd"
            },
            "debugSymbols": {
-                "windows-x64": "fd8ecd1d8cd2ef049d9f4d7fb5c134f784836d6020758094855dfa98bd025036"
+                "windows-x64": "fbddd1f659c360f2291911ac5709b67b6f8182e6bca519d24712e4f6fd3cc865"
            }
        }
    },
@@ -38,7 +38,7 @@
    },
    "name": "obs-localvocal",
    "displayName": "OBS Localvocal",
-    "version": "0.3.2",
+    "version": "0.3.3",
    "author": "Roy Shilkrot",
    "website": "https://github.com/occ-ai/obs-localvocal",
    "email": "roy.shil@gmail.com",
--- a/cmake/BuildWhispercpp.cmake
+++ b/cmake/BuildWhispercpp.cmake
@@ -80,7 +80,8 @@ elseif(WIN32)
  FetchContent_Declare(
    whispercpp_fetch
    URL ${WHISPER_CPP_URL}
-    URL_HASH SHA256=${WHISPER_CPP_HASH})
+    URL_HASH SHA256=${WHISPER_CPP_HASH}
+    DOWNLOAD_EXTRACT_TIMESTAMP TRUE)
  FetchContent_MakeAvailable(whispercpp_fetch)

  add_library(Whispercpp::Whisper SHARED IMPORTED)
@@ -104,8 +105,20 @@ elseif(WIN32)

  # glob all dlls in the bin directory and install them
  file(GLOB WHISPER_DLLS ${whispercpp_fetch_SOURCE_DIR}/bin/*.dll)
-  install(FILES ${WHISPER_DLLS} DESTINATION "obs-plugins/64bit")
+  foreach(FILE ${WHISPER_DLLS})
+    file(RELATIVE_PATH REL_FILE ${whispercpp_fetch_SOURCE_DIR}/bin ${FILE})
+    set(DEST_DIR "${CMAKE_SOURCE_DIR}/release/${CMAKE_BUILD_TYPE}/obs-plugins/64bit")
+    set(DEST_FILE "${DEST_DIR}/${REL_FILE}")

+    if(NOT EXISTS ${DEST_DIR})
+      file(MAKE_DIRECTORY ${DEST_DIR})
+    endif()
+
+    if(NOT EXISTS ${DEST_FILE} OR ${FILE} IS_NEWER_THAN ${DEST_FILE})
+      message(STATUS "Copying ${FILE} to ${DEST_FILE}")
+      file(COPY ${FILE} DESTINATION ${DEST_DIR})
+    endif()
+  endforeach()
 else()
  set(Whispercpp_Build_GIT_TAG "v1.6.2")
  set(WHISPER_EXTRA_CXX_FLAGS "-fPIC")
--- a/cmake/macos/compilerconfig.cmake
+++ b/cmake/macos/compilerconfig.cmake
@@ -55,4 +55,4 @@ else()
 endif()

 add_compile_definitions($<$<CONFIG:DEBUG>:DEBUG> $<$<CONFIG:DEBUG>:_DEBUG> SIMDE_ENABLE_OPENMP)
-add_compile_options(-Wno-error=newline-eof)
+add_compile_options(-Wno-error=newline-eof -Wno-error=deprecated-declarations -Wno-deprecated-declarations)
--- a/data/locale/en-US.ini
+++ b/data/locale/en-US.ini
@@ -83,3 +83,5 @@ log_group="Logging"
 advanced_group="Advanced Configuration"
 buffered_output_parameters="Buffered Output Configuration"
 file_output_info="Note: Translation output will be saved to a file in the same directory with the target language added to the name, e.g. 'output_es.srt'."
+partial_transcription="Enable Partial Transcription"
+partial_transcription_info="Partial transcription will increase processing load on your machine to transcribe content in real-time, which may impact performance."
--- a/patch_libobs.diff
+++ b/patch_libobs.diff
@@ -1,20 +0,0 @@
-diff --git a/libobs/CMakeLists.txt b/libobs/CMakeLists.txt
-index d2e2671..5a9242a 100644
--- a/libobs/CMakeLists.txt
-+++ b/libobs/CMakeLists.txt
-@@ -263,6 +263,7 @@ set(public_headers
-     graphics/vec3.h
-     graphics/vec4.h
-     media-io/audio-io.h
-+    media-io/audio-resampler.h
-     media-io/frame-rate.h
-     media-io/media-io-defs.h
-     media-io/video-io.h
-@@ -287,6 +288,7 @@ set(public_headers
-     util/base.h
-     util/bmem.h
-     util/c99defs.h
-+    util/circlebuf.h
-     util/darray.h
-     util/profiler.h
-     util/sse-intrin.h
--- a/src/transcription-filter-callbacks.cpp
+++ b/src/transcription-filter-callbacks.cpp
@@ -188,7 +188,8 @@ void set_text_callback(struct transcription_filter_data *gf,
 		       const DetectionResultWithText &resultIn)
 {
 	DetectionResultWithText result = resultIn;
-	if (!result.text.empty() && result.result == DETECTION_RESULT_SPEECH) {
+	if (!result.text.empty() && (result.result == DETECTION_RESULT_SPEECH ||
+				     result.result == DETECTION_RESULT_PARTIAL)) {
 		gf->last_sub_render_time = now_ms();
 		gf->cleared_last_sub = false;
 	}
@@ -231,7 +232,10 @@ void set_text_callback(struct transcription_filter_data *gf,
 			str_copy = translated_sentence;
 		} else {
 			if (gf->buffered_output) {
+				if (result.result == DETECTION_RESULT_SPEECH) {
+					// buffered output - add the sentence to the monitor
 					gf->translation_monitor.addSentence(translated_sentence);
+				}
 			} else {
 				// non-buffered output - send the sentence to the selected source
 				send_caption_to_source(gf->translation_output, translated_sentence,
@@ -241,17 +245,20 @@ void set_text_callback(struct transcription_filter_data *gf,
 	}

 	if (gf->buffered_output) {
+		if (result.result == DETECTION_RESULT_SPEECH) {
 			gf->captions_monitor.addSentence(str_copy);
+		}
 	} else {
 		// non-buffered output - send the sentence to the selected source
 		send_caption_to_source(gf->text_source_name, str_copy, gf);
 	}

-	if (gf->caption_to_stream) {
+	if (gf->caption_to_stream && result.result == DETECTION_RESULT_SPEECH) {
 		send_caption_to_stream(result, str_copy, gf);
 	}

-	if (gf->save_to_file && gf->output_file_path != "") {
+	if (gf->save_to_file && gf->output_file_path != "" &&
+	    result.result == DETECTION_RESULT_SPEECH) {
 		send_sentence_to_file(gf, result, str_copy, translated_sentence);
 	}
 };
@@ -291,8 +298,10 @@ void reset_caption_state(transcription_filter_data *gf_)
 {
 	if (gf_->captions_monitor.isEnabled()) {
 		gf_->captions_monitor.clear();
+		gf_->translation_monitor.clear();
 	}
 	send_caption_to_source(gf_->text_source_name, "", gf_);
+	send_caption_to_source(gf_->translation_output, "", gf_);
 	// flush the buffer
 	{
 		std::lock_guard<std::mutex> lock(gf_->whisper_buf_mutex);
@@ -326,6 +335,7 @@ void media_started_callback(void *data_, calldata_t *cd)
 	gf_->active = true;
 	reset_caption_state(gf_);
 }
+
 void media_pause_callback(void *data_, calldata_t *cd)
 {
 	UNUSED_PARAMETER(cd);
@@ -333,6 +343,7 @@ void media_pause_callback(void *data_, calldata_t *cd)
 	obs_log(gf_->log_level, "media_pause");
 	gf_->active = false;
 }
+
 void media_restart_callback(void *data_, calldata_t *cd)
 {
 	UNUSED_PARAMETER(cd);
@@ -341,6 +352,7 @@ void media_restart_callback(void *data_, calldata_t *cd)
 	gf_->active = true;
 	reset_caption_state(gf_);
 }
+
 void media_stopped_callback(void *data_, calldata_t *cd)
 {
 	UNUSED_PARAMETER(cd);
--- a/src/transcription-filter-data.h
+++ b/src/transcription-filter-data.h
@@ -81,6 +81,8 @@ struct transcription_filter_data {
 	bool enable_audio_chunks_callback = false;
 	bool source_signals_set = false;
 	bool initial_creation = true;
+	bool partial_transcription = false;
+	int partial_latency = 1000;

 	// Last transcription result
 	std::string last_text;
--- a/src/transcription-filter-properties.cpp
+++ b/src/transcription-filter-properties.cpp
@@ -46,8 +46,9 @@ bool advanced_settings_callback(obs_properties_t *props, obs_property_t *propert
 	UNUSED_PARAMETER(property);
 	// If advanced settings is enabled, show the advanced settings group
 	const bool show_hide = obs_data_get_int(settings, "advanced_settings_mode") == 1;
-	for (const std::string &prop_name : {"whisper_params_group", "buffered_output_group",
-					     "log_group", "advanced_group", "file_output_enable"}) {
+	for (const std::string &prop_name :
+	     {"whisper_params_group", "buffered_output_group", "log_group", "advanced_group",
+	      "file_output_enable", "partial_group"}) {
 		obs_property_set_visible(obs_properties_get(props, prop_name.c_str()), show_hide);
 	}
 	translation_options_callback(props, NULL, settings);
@@ -457,6 +458,22 @@ void add_general_group_properties(obs_properties_t *ppts)
 	}
 }

+void add_partial_group_properties(obs_properties_t *ppts)
+{
+	// add a group for partial transcription
+	obs_properties_t *partial_group = obs_properties_create();
+	obs_properties_add_group(ppts, "partial_group", MT_("partial_transcription"),
+				 OBS_GROUP_CHECKABLE, partial_group);
+
+	// add text info
+	obs_properties_add_text(partial_group, "partial_info", MT_("partial_transcription_info"),
+				OBS_TEXT_INFO);
+
+	// add slider for partial latecy
+	obs_properties_add_int_slider(partial_group, "partial_latency", MT_("partial_latency"), 500,
+				      3000, 50);
+}
+
 obs_properties_t *transcription_filter_properties(void *data)
 {
 	struct transcription_filter_data *gf =
@@ -480,6 +497,7 @@ obs_properties_t *transcription_filter_properties(void *data)
 	add_buffered_output_group_properties(ppts);
 	add_advanced_group_properties(ppts, gf);
 	add_logging_group_properties(ppts);
+	add_partial_group_properties(ppts);
 	add_whisper_params_group_properties(ppts);

 	// Add a informative text about the plugin
--- a/src/transcription-filter.cpp
+++ b/src/transcription-filter.cpp
@@ -105,13 +105,8 @@ struct obs_audio_data *transcription_filter_filter_audio(void *data, struct obs_
 		// push audio packet info (timestamp/frame count) to info circlebuf
 		struct transcription_filter_audio_info info = {0};
 		info.frames = audio->frames; // number of frames in this packet
-		// check if the timestamp is a false "negative" value for uint64_t
-		if (audio->timestamp > (std::numeric_limits<uint64_t>::max() - 100000000)) {
-			// set the timestamp to the current time
-			info.timestamp_offset_ns = 0;
-		} else {
-			info.timestamp_offset_ns = audio->timestamp; // timestamp of this packet
-		}
+		// calculate timestamp offset from the start of the stream
+		info.timestamp_offset_ns = now_ns() - gf->start_timestamp_ms * 1000000;
 		circlebuf_push_back(&gf->info_buffer, &info, sizeof(info));
 	}

@@ -190,6 +185,8 @@ void transcription_filter_update(void *data, obs_data_t *s)
 	gf->process_while_muted = obs_data_get_bool(s, "process_while_muted");
 	gf->min_sub_duration = (int)obs_data_get_int(s, "min_sub_duration");
 	gf->last_sub_render_time = now_ms();
+	gf->partial_transcription = obs_data_get_bool(s, "partial_group");
+	gf->partial_latency = (int)obs_data_get_int(s, "partial_latency");
 	bool new_buffered_output = obs_data_get_bool(s, "buffered_output");
 	int new_buffer_num_lines = (int)obs_data_get_int(s, "buffer_num_lines");
 	int new_buffer_num_chars_per_line = (int)obs_data_get_int(s, "buffer_num_chars_per_line");
@@ -584,6 +581,8 @@ void transcription_filter_defaults(obs_data_t *s)
 	obs_data_set_default_string(s, "translation_model_path_external", "");
 	obs_data_set_default_int(s, "translate_input_tokenization_style", INPUT_TOKENIZAION_M2M100);
 	obs_data_set_default_double(s, "sentence_psum_accept_thresh", 0.4);
+	obs_data_set_default_bool(s, "partial_group", false);
+	obs_data_set_default_int(s, "partial_latency", 1100);

 	// translation options
 	obs_data_set_default_double(s, "translation_sampling_temperature", 0.1);
--- a/src/transcription-utils.h
+++ b/src/transcription-utils.h
@@ -24,6 +24,14 @@ inline uint64_t now_ms()
 		.count();
 }

+// Get the current timestamp in nano seconds since epoch
+inline uint64_t now_ns()
+{
+	return std::chrono::duration_cast<std::chrono::nanoseconds>(
+		       std::chrono::system_clock::now().time_since_epoch())
+		.count();
+}
+
 // Split a string into words based on spaces
 std::vector<std::string> split_words(const std::string &str_copy);

--- a/src/whisper-utils/whisper-model-utils.cpp
+++ b/src/whisper-utils/whisper-model-utils.cpp
@@ -63,7 +63,8 @@ void update_whisper_model(struct transcription_filter_data *gf)
 			obs_log(gf->log_level, "model path changed from %s to %s",
 				gf->whisper_model_path.c_str(), new_model_path.c_str());

-			gf->whisper_model_loaded_new = true;
+			// check if this is loading the initial model or a switch
+			gf->whisper_model_loaded_new = !gf->whisper_model_path.empty();
 		}

 		// check if the new model is external file
--- a/src/whisper-utils/whisper-processing.cpp
+++ b/src/whisper-utils/whisper-processing.cpp
@@ -24,6 +24,7 @@ struct vad_state {
 	bool vad_on;
 	uint64_t start_ts_offest_ms;
 	uint64_t end_ts_offset_ms;
+	uint64_t last_partial_segment_end_ts;
 };

 struct whisper_context *init_whisper_context(const std::string &model_path_in,
@@ -126,18 +127,25 @@ struct whisper_context *init_whisper_context(const std::string &model_path_in,

 struct DetectionResultWithText run_whisper_inference(struct transcription_filter_data *gf,
 						     const float *pcm32f_data_,
-						     size_t pcm32f_num_samples,
-						     uint64_t start_offset_ms = 0,
-						     uint64_t end_offset_ms = 0)
+						     size_t pcm32f_num_samples, uint64_t t0 = 0,
+						     uint64_t t1 = 0,
+						     int vad_state = VAD_STATE_WAS_OFF)
 {
 	if (gf == nullptr) {
 		obs_log(LOG_ERROR, "run_whisper_inference: gf is null");
-		return {DETECTION_RESULT_UNKNOWN, "", start_offset_ms, end_offset_ms, {}, ""};
+		return {DETECTION_RESULT_UNKNOWN, "", t0, t1, {}, ""};
 	}

 	if (pcm32f_data_ == nullptr || pcm32f_num_samples == 0) {
 		obs_log(LOG_ERROR, "run_whisper_inference: pcm32f_data is null or size is 0");
-		return {DETECTION_RESULT_UNKNOWN, "", start_offset_ms, end_offset_ms, {}, ""};
+		return {DETECTION_RESULT_UNKNOWN, "", t0, t1, {}, ""};
+	}
+
+	// if the time difference between t0 and t1 is less than 50 ms - skip
+	if (t1 - t0 < 50) {
+		obs_log(gf->log_level,
+			"Time difference between t0 and t1 is less than 50 ms, skipping");
+		return {DETECTION_RESULT_UNKNOWN, "", t0, t1, {}, ""};
 	}

 	obs_log(gf->log_level, "%s: processing %d samples, %.3f sec, %d threads", __func__,
@@ -163,8 +171,6 @@ struct DetectionResultWithText run_whisper_inference(struct transcription_filter

 	// duration in ms
 	const uint64_t duration_ms = (uint64_t)(pcm32f_size * 1000 / WHISPER_SAMPLE_RATE);
-	const uint64_t t0 = start_offset_ms;
-	const uint64_t t1 = end_offset_ms;

 	std::lock_guard<std::mutex> lock(gf->whisper_ctx_mutex);
 	if (gf->whisper_context == nullptr) {
@@ -202,7 +208,8 @@ struct DetectionResultWithText run_whisper_inference(struct transcription_filter
 	if (whisper_full_result != 0) {
 		obs_log(LOG_WARNING, "failed to process audio, error %d", whisper_full_result);
 		return {DETECTION_RESULT_UNKNOWN, "", t0, t1, {}, ""};
-	} else {
+	}
+
 	float sentence_p = 0.0f;
 	std::string text = "";
 	std::string tokenIds = "";
@@ -212,14 +219,12 @@ struct DetectionResultWithText run_whisper_inference(struct transcription_filter
 		const int n_tokens = whisper_full_n_tokens(gf->whisper_context, n_segment);
 		for (int j = 0; j < n_tokens; ++j) {
 			// get token
-				whisper_token_data token = whisper_full_get_token_data(
-					gf->whisper_context, n_segment, j);
-				const char *token_str =
-					whisper_token_to_str(gf->whisper_context, token.id);
+			whisper_token_data token =
+				whisper_full_get_token_data(gf->whisper_context, n_segment, j);
+			const char *token_str = whisper_token_to_str(gf->whisper_context, token.id);
 			bool keep = true;
 			// if the token starts with '[' and ends with ']', don't keep it
-				if (token_str[0] == '[' &&
-				    token_str[strlen(token_str) - 1] == ']') {
+			if (token_str[0] == '[' && token_str[strlen(token_str) - 1] == ']') {
 				keep = false;
 			}
 			// if this is a special token, don't keep it
@@ -234,8 +239,8 @@ struct DetectionResultWithText run_whisper_inference(struct transcription_filter
 			if (token.id > 50365 && token.id <= 51865) {
 				const float time = ((float)token.id - 50365.0f) * 0.02f;
 				const float duration_s = (float)duration_ms / 1000.0f;
-					const float ratio = std::max(time, duration_s) /
-							    std::min(time, duration_s);
+				const float ratio =
+					std::max(time, duration_s) / std::min(time, duration_s);
 				obs_log(gf->log_level,
 					"Time token found %d -> %.3f. Duration: %.3f. Ratio: %.3f.",
 					token.id, time, duration_s, ratio);
@@ -243,12 +248,7 @@ struct DetectionResultWithText run_whisper_inference(struct transcription_filter
 					// ratio is too high, skip this detection
 					obs_log(gf->log_level,
 						"Time token ratio too high, skipping");
-						return {DETECTION_RESULT_SILENCE,
-							"",
-							t0,
-							t1,
-							{},
-							language};
+					return {DETECTION_RESULT_SILENCE, "", t0, t1, {}, language};
 				}
 				keep = false;
 			}
@@ -272,16 +272,21 @@ struct DetectionResultWithText run_whisper_inference(struct transcription_filter
 	obs_log(gf->log_level, "Decoded sentence: '%s'", text.c_str());

 	if (gf->log_words) {
-			obs_log(LOG_INFO, "[%s --> %s] (%.3f) %s", to_timestamp(t0).c_str(),
-				to_timestamp(t1).c_str(), sentence_p, text.c_str());
+		obs_log(LOG_INFO, "[%s --> %s]%s(%.3f) %s", to_timestamp(t0).c_str(),
+			to_timestamp(t1).c_str(), vad_state == VAD_STATE_PARTIAL ? "P" : " ",
+			sentence_p, text.c_str());
 	}

 	if (text.empty() || text == "." || text == " " || text == "\n") {
 		return {DETECTION_RESULT_SILENCE, "", t0, t1, {}, language};
 	}

-		return {DETECTION_RESULT_SPEECH, text, t0, t1, tokens, language};
-	}
+	return {vad_state == VAD_STATE_PARTIAL ? DETECTION_RESULT_PARTIAL : DETECTION_RESULT_SPEECH,
+		text,
+		t0,
+		t1,
+		tokens,
+		language};
 }

 void run_inference_and_callbacks(transcription_filter_data *gf, uint64_t start_offset_ms,
@@ -293,15 +298,22 @@ void run_inference_and_callbacks(transcription_filter_data *gf, uint64_t start_o
 	const size_t pcm32f_size_with_silence = pcm32f_size + 2 * WHISPER_SAMPLE_RATE / 100;
 	// allocate a new buffer and copy the data to it
 	float *pcm32f_data = (float *)bzalloc(pcm32f_size_with_silence * sizeof(float));
+	if (vad_state == VAD_STATE_PARTIAL) {
+		// peek instead of pop, since this is a partial run that keeps the data in the buffer
+		circlebuf_peek_back(&gf->whisper_buffer, pcm32f_data + WHISPER_SAMPLE_RATE / 100,
+				    pcm32f_size * sizeof(float));
+	} else {
 		circlebuf_pop_back(&gf->whisper_buffer, pcm32f_data + WHISPER_SAMPLE_RATE / 100,
 				   pcm32f_size * sizeof(float));
+	}

-	struct DetectionResultWithText inference_result = run_whisper_inference(
-		gf, pcm32f_data, pcm32f_size_with_silence, start_offset_ms, end_offset_ms);
+	struct DetectionResultWithText inference_result =
+		run_whisper_inference(gf, pcm32f_data, pcm32f_size_with_silence, start_offset_ms,
+				      end_offset_ms, vad_state);
 	// output inference result to a text source
 	set_text_callback(gf, inference_result);

-	if (gf->enable_audio_chunks_callback) {
+	if (gf->enable_audio_chunks_callback && vad_state != VAD_STATE_PARTIAL) {
 		audio_chunk_callback(gf, pcm32f_data, pcm32f_size_with_silence, vad_state,
 				     inference_result);
 	}
@@ -355,6 +367,15 @@ vad_state vad_based_segmentation(transcription_filter_data *gf, vad_state last_v
 		}
 		end_timestamp_offset_ns = info_from_buf.timestamp_offset_ns;

+		if (start_timestamp_offset_ns > end_timestamp_offset_ns) {
+			// this may happen when the incoming media has a timestamp reset
+			// in this case, we should figure out the start timestamp from the end timestamp
+			// and the number of frames
+			start_timestamp_offset_ns =
+				end_timestamp_offset_ns -
+				num_frames_from_infos * 1000000000 / gf->sample_rate;
+		}
+
 		/* Pop from input circlebuf */
 		for (size_t c = 0; c < gf->channels; c++) {
 			// Push the new data to copy_buffers[c]
@@ -388,7 +409,8 @@ vad_state vad_based_segmentation(transcription_filter_data *gf, vad_state last_v
 	const uint64_t start_ts_offset_ms = start_timestamp_offset_ns / 1000000;
 	const uint64_t end_ts_offset_ms = end_timestamp_offset_ns / 1000000;

-	vad_state current_vad_state = {false, start_ts_offset_ms, end_ts_offset_ms};
+	vad_state current_vad_state = {false, start_ts_offset_ms, end_ts_offset_ms,
+				       last_vad_state.last_partial_segment_end_ts};

 	std::vector<timestamp_t> stamps = gf->vad->get_speech_timestamps();
 	if (stamps.size() == 0) {
@@ -399,6 +421,7 @@ vad_state vad_based_segmentation(transcription_filter_data *gf, vad_state last_v
 			run_inference_and_callbacks(gf, last_vad_state.start_ts_offest_ms,
 						    last_vad_state.end_ts_offset_ms,
 						    VAD_STATE_WAS_ON);
+			current_vad_state.last_partial_segment_end_ts = 0;
 		}

 		if (gf->enable_audio_chunks_callback) {
@@ -410,7 +433,10 @@ vad_state vad_based_segmentation(transcription_filter_data *gf, vad_state last_v
 					      current_vad_state.end_ts_offset_ms,
 					      {}});
 		}
-	} else {
+
+		return current_vad_state;
+	}
+
 	// process vad segments
 	for (size_t i = 0; i < stamps.size(); i++) {
 		int start_frame = stamps[i].start;
@@ -430,49 +456,73 @@ vad_state vad_based_segmentation(transcription_filter_data *gf, vad_state last_v
 		}

 		const int number_of_frames = end_frame - start_frame;
+
 		// push the data into gf-whisper_buffer
 		circlebuf_push_back(&gf->whisper_buffer, resampled_16khz[0] + start_frame,
 				    number_of_frames * sizeof(float));
+
 		obs_log(gf->log_level,
 			"VAD segment %d. pushed %d to %d (%d frames / %lu ms). current size: %lu bytes / %lu frames / %lu ms",
 			i, start_frame, end_frame, number_of_frames,
-				number_of_frames * 1000 / WHISPER_SAMPLE_RATE,
-				gf->whisper_buffer.size, gf->whisper_buffer.size / sizeof(float),
-				gf->whisper_buffer.size / sizeof(float) * 1000 /
-					WHISPER_SAMPLE_RATE);
+			number_of_frames * 1000 / WHISPER_SAMPLE_RATE, gf->whisper_buffer.size,
+			gf->whisper_buffer.size / sizeof(float),
+			gf->whisper_buffer.size / sizeof(float) * 1000 / WHISPER_SAMPLE_RATE);

-			// if the segment is in the middle of the buffer, send it to inference
+		// segment "end" is in the middle of the buffer, send it to inference
 		if (stamps[i].end < (int)resampled_16khz_frames) {
 			// new "ending" segment (not up to the end of the buffer)
 			obs_log(gf->log_level, "VAD segment end -> send to inference");
 			// find the end timestamp of the segment
 			const uint64_t segment_end_ts =
 				start_ts_offset_ms + end_frame * 1000 / WHISPER_SAMPLE_RATE;
-				run_inference_and_callbacks(gf, last_vad_state.start_ts_offest_ms,
-							    segment_end_ts,
-							    last_vad_state.vad_on
-								    ? VAD_STATE_WAS_ON
-								    : VAD_STATE_WAS_OFF);
+			run_inference_and_callbacks(
+				gf, last_vad_state.start_ts_offest_ms, segment_end_ts,
+				last_vad_state.vad_on ? VAD_STATE_WAS_ON : VAD_STATE_WAS_OFF);
 			current_vad_state.vad_on = false;
-				current_vad_state.start_ts_offest_ms =
-					current_vad_state.end_ts_offset_ms;
+			current_vad_state.start_ts_offest_ms = current_vad_state.end_ts_offset_ms;
 			current_vad_state.end_ts_offset_ms = 0;
-			} else {
+			current_vad_state.last_partial_segment_end_ts = 0;
+			last_vad_state = current_vad_state;
+			continue;
+		}
+
+		// end not reached - speech is ongoing
 		current_vad_state.vad_on = true;
 		if (last_vad_state.vad_on) {
-					current_vad_state.start_ts_offest_ms =
-						last_vad_state.start_ts_offest_ms;
+			current_vad_state.start_ts_offest_ms = last_vad_state.start_ts_offest_ms;
 		} else {
 			current_vad_state.start_ts_offest_ms =
-						start_ts_offset_ms +
-						start_frame * 1000 / WHISPER_SAMPLE_RATE;
-				}
-				obs_log(gf->log_level,
-					"end not reached. vad state: start ts: %llu, end ts: %llu",
-					current_vad_state.start_ts_offest_ms,
-					current_vad_state.end_ts_offset_ms);
+				start_ts_offset_ms + start_frame * 1000 / WHISPER_SAMPLE_RATE;
 		}
+		obs_log(gf->log_level, "end not reached. vad state: start ts: %llu, end ts: %llu",
+			current_vad_state.start_ts_offest_ms, current_vad_state.end_ts_offset_ms);
+
 		last_vad_state = current_vad_state;
+
+		// if partial transcription is enabled, check if we should send a partial segment
+		if (!gf->partial_transcription) {
+			continue;
+		}
+
+		// current length of audio in buffer
+		const uint64_t current_length_ms =
+			(current_vad_state.end_ts_offset_ms > 0
+				 ? current_vad_state.end_ts_offset_ms
+				 : current_vad_state.start_ts_offest_ms) -
+			(current_vad_state.last_partial_segment_end_ts > 0
+				 ? current_vad_state.last_partial_segment_end_ts
+				 : current_vad_state.start_ts_offest_ms);
+		obs_log(gf->log_level, "current buffer length after last partial (%lu): %lu ms",
+			current_vad_state.last_partial_segment_end_ts, current_length_ms);
+
+		if (current_length_ms > (uint64_t)gf->partial_latency) {
+			current_vad_state.last_partial_segment_end_ts =
+				current_vad_state.end_ts_offset_ms;
+			// send partial segment to inference
+			obs_log(gf->log_level, "Partial segment -> send to inference");
+			run_inference_and_callbacks(gf, current_vad_state.start_ts_offest_ms,
+						    current_vad_state.end_ts_offset_ms,
+						    VAD_STATE_PARTIAL);
 		}
 	}

@@ -491,7 +541,7 @@ void whisper_loop(void *data)

 	obs_log(gf->log_level, "Starting whisper thread");

-	vad_state current_vad_state = {false, 0, 0};
+	vad_state current_vad_state = {false, 0, 0, 0};
 	// 500 ms worth of audio is needed for VAD segmentation
 	uint32_t min_num_bytes_for_vad = (gf->sample_rate / 2) * sizeof(float);

--- a/src/whisper-utils/whisper-processing.h
+++ b/src/whisper-utils/whisper-processing.h
@@ -17,6 +17,7 @@ enum DetectionResult {
 	DETECTION_RESULT_SPEECH = 2,
 	DETECTION_RESULT_SUPPRESSED = 3,
 	DETECTION_RESULT_NO_INFERENCE = 4,
+	DETECTION_RESULT_PARTIAL = 5,
 };

 struct DetectionResultWithText {
@@ -28,7 +29,7 @@ struct DetectionResultWithText {
 	std::string language;
 };

-enum VadState { VAD_STATE_WAS_ON = 0, VAD_STATE_WAS_OFF, VAD_STATE_IS_OFF };
+enum VadState { VAD_STATE_WAS_ON = 0, VAD_STATE_WAS_OFF, VAD_STATE_IS_OFF, VAD_STATE_PARTIAL };

 void whisper_loop(void *data);
 struct whisper_context *init_whisper_context(const std::string &model_path,