CCExtractor · shubhrai23 · Aug 12, 2026 · Aug 12, 2026 · Aug 14, 2026
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
@@ -8,6 +8,7 @@ option (WITH_OCR "Build with OCR (Optical Character Recognition) feature" OFF)
 option (WITH_HARDSUBX "Build with support for burned-in subtitles" OFF)
 option (VBI_DEBUG "Enable VBI decoder debug output" OFF)
 option (NETWORKING_DEBUG "Enable networking debug output" OFF)
+option (WITH_GPAC "Compile with GPAC support" ON)
 
 # HARDSUBX requires OCR (tesseract/leptonica) and FFmpeg
 if (WITH_HARDSUBX)
@@ -55,10 +56,13 @@ configure_file (
   "${PROJECT_SOURCE_DIR}/lib_ccx/compile_info_real.h"
   )
 
-add_definitions(-DVERSION_FILE_PRESENT -DFT2_BUILD_LIBRARY -DGPAC_DISABLE_VTT -DGPAC_DISABLE_OD_DUMP -DGPAC_DISABLE_REMOTERY -DNO_GZIP)
+add_definitions(-DVERSION_FILE_PRESENT -DFT2_BUILD_LIBRARY -DNO_GZIP)
 
-if(CMAKE_SIZEOF_VOID_P EQUAL 8)
-  add_definitions(-DGPAC_64_BITS)
+if (WITH_GPAC)
+  add_definitions(-DGPAC_DISABLE_VTT -DGPAC_DISABLE_OD_DUMP -DGPAC_DISABLE_REMOTERY)
+  if(CMAKE_SIZEOF_VOID_P EQUAL 8)
+    add_definitions(-DGPAC_64_BITS)
+  endif()
 endif()
 
 include_directories(${PROJECT_SOURCE_DIR})
@@ -177,7 +181,9 @@ add_subdirectory (lib_ccx)
 
 aux_source_directory(${PROJECT_SOURCE_DIR} SOURCEFILE)
 set (EXTRA_LIBS ${EXTRA_LIBS} ccx)
-set (EXTRA_LIBS ${EXTRA_LIBS} ${GPAC_LIBRARIES})
+if (WITH_GPAC AND GPAC_FOUND)
+    set (EXTRA_LIBS ${EXTRA_LIBS} ${GPAC_LIBRARIES})
+endif()
 # set (EXTRA_LIBS ${EXTRA_LIBS} m)
 
 if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")

diff --git a/src/lib_ccx/CMakeLists.txt b/src/lib_ccx/CMakeLists.txt
@@ -11,10 +11,32 @@ if(WIN32)
 endif(WIN32)
 
 find_package(PkgConfig)
-pkg_check_modules (GPAC REQUIRED gpac)
-
-set (EXTRA_INCLUDES ${EXTRA_INCLUDES} ${GPAC_INCLUDE_DIRS})
-set (EXTRA_LIBS ${EXTRA_LIBS} ${GPAC_LIBRARIES})
+if (WITH_GPAC)
+    pkg_check_modules (GPAC gpac)
+    if (GPAC_FOUND)
+        set (EXTRA_INCLUDES ${EXTRA_INCLUDES} ${GPAC_INCLUDE_DIRS})
+        set (EXTRA_LIBS ${EXTRA_LIBS} ${GPAC_LIBRARIES})
+        add_definitions(-DENABLE_GPAC)
+        set (GPAC_FOUND ${GPAC_FOUND} PARENT_SCOPE)
+        set (GPAC_LIBRARIES ${GPAC_LIBRARIES} PARENT_SCOPE)
+    else ()
+        message(STATUS "GPAC not found via pkg-config. Falling back to FetchContent...")
+        include(FetchContent)
+        FetchContent_Declare(
+            gpac
+            GIT_REPOSITORY https://github.com/gpac/gpac.git
+            GIT_TAG        master
+        )
+        FetchContent_MakeAvailable(gpac)
+
+        # Link against the fetched GPAC
+        set (EXTRA_INCLUDES ${EXTRA_INCLUDES} ${gpac_SOURCE_DIR}/include)
+        set (EXTRA_LIBS ${EXTRA_LIBS} libgpac)
+        add_definitions(-DENABLE_GPAC)
+        set (GPAC_FOUND TRUE PARENT_SCOPE)
+        set (GPAC_LIBRARIES libgpac PARENT_SCOPE)
+    endif ()
+endif ()
 
 if (WITH_FFMPEG)
     find_package(PkgConfig)

diff --git a/src/lib_ccx/mp4.c b/src/lib_ccx/mp4.c
@@ -2,14 +2,17 @@
 #include <time.h>
 #include <stdlib.h>
 
+#include "lib_ccx.h"
+#include "ccx_mp4.h"
+
+#ifdef ENABLE_GPAC
+
 #include <gpac/isomedia.h>
 #include <gpac/mpeg4_odf.h>
-#include "lib_ccx.h"
 #include "utility.h"
 #include "ccx_encoders_common.h"
 #include "ccx_encoders_mcc.h"
 #include "ccx_common_option.h"
-#include "ccx_mp4.h"
 #include "activity.h"
 #include "ccx_dtvcc.h"
 #include "vobsub_decoder.h"
@@ -1121,11 +1124,11 @@ int processmp4(struct lib_ccx_ctx *ctx, struct ccx_s_mp4Cfg *cfg, char *file)
 					const LLONG timestamp = (LLONG)((sample->DTS + sample->CTS_Offset) * 1000) / timescale;
 #endif
 					set_current_pts(dec_ctx->timing, (sample->DTS + sample->CTS_Offset) * MPEG_CLOCK_FREQ / timescale);
-					// For caption-only tracks (c608/c708), set frame type to I-frame
+					// For caption-only tracks (c608/c708, tx3g), set frame type to I-frame
 					// so that set_fts() will set min_pts from the first sample.
 					// Without video frames, frame type would stay Unknown and
 					// min_pts would never be set, causing broken timestamps.
-					if (type == GF_ISOM_MEDIA_CLOSED_CAPTION)
+					if (type == GF_ISOM_MEDIA_CLOSED_CAPTION || type == GF_ISOM_MEDIA_TEXT || type == GF_ISOM_MEDIA_SUBT)
 						dec_ctx->timing->current_picture_coding_type = CCX_FRAME_TYPE_I_FRAME;
 					set_fts(dec_ctx->timing);
 
@@ -1293,3 +1296,25 @@ int dumpchapters(struct lib_ccx_ctx *ctx, struct ccx_s_mp4Cfg *cfg, char *file)
 		gf_fclose(t);
 	return mp4_ret;
 }
+
+#else
+
+int processmp4(struct lib_ccx_ctx *ctx, struct ccx_s_mp4Cfg *cfg, char *file)
+{
+	mprint("GPAC support is disabled. MP4 parsing will not work. Recompile with GPAC support to enable this feature.\n");
+	return -1;
+}
+
+int dumpchapters(struct lib_ccx_ctx *ctx, struct ccx_s_mp4Cfg *cfg, char *file)
+{
+	mprint("GPAC support is disabled. MP4 chapters will not work. Recompile with GPAC support to enable this feature.\n");
+	return -1;
+}
+
+unsigned char *ccdp_find_data(unsigned char *ccdp_atom_content, unsigned int len, unsigned int *cc_count)
+{
+	*cc_count = 0;
+	return NULL;
+}
+
+#endif
diff --git a/src/lib_ccx/params.c b/src/lib_ccx/params.c
@@ -1,7 +1,9 @@
 #include <png.h>
 #include "zlib.h"
+#ifdef ENABLE_GPAC
 #include "gpac/setup.h"
 #include "gpac/version.h"
+#endif
 #include "lib_ccx.h"
 #include "ccx_common_option.h"
 #include "utility.h"
@@ -778,7 +780,9 @@ void version(char *location)
 	mprint("	Leptonica Version: %s\n", leptversion);
 	lept_free(leptversion);
 #endif // ENABLE_OCR
+#ifdef ENABLE_GPAC
 	mprint("	libGPAC Version: %s\n", GPAC_VERSION);
+#endif
 	mprint("	zlib: %s\n", ZLIB_VERSION);
 	mprint("	utf8proc Version: %s\n", (const char *)utf8proc_version());
 	mprint("	libpng Version: %s\n", PNG_LIBPNG_VER_STRING);

diff --git a/temp_mp4_diff.patch b/temp_mp4_diff.patch
diff --git a/windows/ccextractor.vcxproj b/windows/ccextractor.vcxproj
@@ -289,7 +289,7 @@
         ..\src\thirdparty\freetype\include;..\src;..\src\thirdparty\win_spec_incld;..\src\lib_ccx;..\src\thirdparty\lib_hash;..\src\lib_ccx\zvbi;..\src\thirdparty\win_iconv;..\src\thirdparty\;..\src;$(VCPKG_ROOT)\installed\$(VCPKG_DEFAULT_TRIPLET)\include;
         "$(GpacDir)\sdk\include";%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <PreprocessorDefinitions>
-        $(ExtraDefines);SEGMENT_BY_FILE_TIME;ENABLE_HARDSUBX;FT2_BUILD_LIBRARY;GPAC_DISABLE_VTT;GPAC_DISABLE_OD_DUMP;ENABLE_OCR;WIN32;_DEBUG;_CONSOLE;_FILE_OFFSET_BITS=64;GPAC_DISABLE_REMOTERY;GPAC_DISABLE_ZLIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+        $(ExtraDefines);SEGMENT_BY_FILE_TIME;ENABLE_HARDSUBX;FT2_BUILD_LIBRARY;GPAC_DISABLE_VTT;GPAC_DISABLE_OD_DUMP;ENABLE_OCR;ENABLE_GPAC;WIN32;_DEBUG;_CONSOLE;_FILE_OFFSET_BITS=64;GPAC_DISABLE_REMOTERY;GPAC_DISABLE_ZLIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <BasicRuntimeChecks>Default</BasicRuntimeChecks>
       <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
       <PrecompiledHeader>
@@ -337,7 +337,7 @@
         ..\src\thirdparty\freetype\include;..\src;..\src\thirdparty\win_spec_incld;..\src\lib_ccx;..\src\thirdparty\lib_hash;..\src\lib_ccx\zvbi;..\src\thirdparty\win_iconv;..\src\thirdparty\;..\src;$(VCPKG_ROOT)\installed\$(VCPKG_DEFAULT_TRIPLET)\include;
         "$(GpacDir)\sdk\include";%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <PreprocessorDefinitions>
-        $(ExtraDefines);SEGMENT_BY_FILE_TIME;ENABLE_HARDSUBX;FT2_BUILD_LIBRARY;GPAC_DISABLE_VTT;GPAC_DISABLE_OD_DUMP;ENABLE_OCR;WIN32;_DEBUG;_CONSOLE;_FILE_OFFSET_BITS=64;GPAC_DISABLE_REMOTERY;GPAC_DISABLE_ZLIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+        $(ExtraDefines);SEGMENT_BY_FILE_TIME;ENABLE_HARDSUBX;FT2_BUILD_LIBRARY;GPAC_DISABLE_VTT;GPAC_DISABLE_OD_DUMP;ENABLE_OCR;ENABLE_GPAC;WIN32;_DEBUG;_CONSOLE;_FILE_OFFSET_BITS=64;GPAC_DISABLE_REMOTERY;GPAC_DISABLE_ZLIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <BasicRuntimeChecks>Default</BasicRuntimeChecks>
       <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
       <PrecompiledHeader>
@@ -384,7 +384,7 @@
         ..\src\thirdparty\freetype\include;..\src;..\src\thirdparty\win_spec_incld;..\src\lib_ccx;..\src\thirdparty\lib_hash;..\src\lib_ccx\zvbi;..\src\thirdparty\win_iconv;..\src\thirdparty\;..\src;$(VCPKG_ROOT)\installed\$(VCPKG_DEFAULT_TRIPLET)\include;
         "$(GpacDir)\sdk\include";%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <PreprocessorDefinitions>
-        $(ExtraDefines);ENABLE_HARDSUBX;FT2_BUILD_LIBRARY;GPAC_DISABLE_VTT;GPAC_DISABLE_OD_DUMP;VERSION_FILE_PRESENT;ENABLE_OCR;WIN32;NDEBUG;_CONSOLE;_FILE_OFFSET_BITS=64;GPAC_DISABLE_REMOTERY;GPAC_DISABLE_ZLIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+        $(ExtraDefines);ENABLE_HARDSUBX;FT2_BUILD_LIBRARY;GPAC_DISABLE_VTT;GPAC_DISABLE_OD_DUMP;VERSION_FILE_PRESENT;ENABLE_OCR;ENABLE_GPAC;WIN32;NDEBUG;_CONSOLE;_FILE_OFFSET_BITS=64;GPAC_DISABLE_REMOTERY;GPAC_DISABLE_ZLIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <PrecompiledHeader>
       </PrecompiledHeader>
@@ -432,7 +432,7 @@
         ..\src\thirdparty\freetype\include;..\src;..\src\thirdparty\win_spec_incld;..\src\lib_ccx;..\src\thirdparty\lib_hash;..\src\lib_ccx\zvbi;..\src\thirdparty\win_iconv;..\src\thirdparty\;..\src;$(VCPKG_ROOT)\installed\$(VCPKG_DEFAULT_TRIPLET)\include;
         "$(GpacDir)\sdk\include";%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <PreprocessorDefinitions>
-        $(ExtraDefines);ENABLE_HARDSUBX;FT2_BUILD_LIBRARY;GPAC_DISABLE_VTT;GPAC_DISABLE_OD_DUMP;VERSION_FILE_PRESENT;ENABLE_OCR;WIN32;NDEBUG;_CONSOLE;_FILE_OFFSET_BITS=64;GPAC_DISABLE_REMOTERY;GPAC_DISABLE_ZLIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+        $(ExtraDefines);ENABLE_HARDSUBX;FT2_BUILD_LIBRARY;GPAC_DISABLE_VTT;GPAC_DISABLE_OD_DUMP;VERSION_FILE_PRESENT;ENABLE_OCR;ENABLE_GPAC;WIN32;NDEBUG;_CONSOLE;_FILE_OFFSET_BITS=64;GPAC_DISABLE_REMOTERY;GPAC_DISABLE_ZLIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <PrecompiledHeader>
       </PrecompiledHeader>