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• FFMPEG is really slow at extracting subtitles

  3 mars 2021, par Gustav P Svensson

  I'm trying to extract the subtitles from a 1080P video, around 40min long. I'm currently using this command (using fluent-ffmpeg in node, but the translated command is this) :

  


  ffmpeg -threads 3  -map 0: -c copy 


  


  This command takes about 20-30 min to complete. I've searched quite a lot on how to speed up this process, if I look at my task manager I can see that ffmpeg is using 0.1% of the CPU which makes me think that it's possible to speed up this process.

  


  I'm not sure if the -threads option is actually doing anything when extracting subtitles but I don't think it should make it slower atleast ?

  


  So my question is, is it possible to speed up this process ? I appriciate any help.

  


  Full FFMPEG log:
fmpeg version 3.4.8-0ubuntu0.2 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, matroska,webm, from '/home/test.mkv:
  Metadata:
    encoder         : libebml v1.3.6 + libmatroska v1.4.9
    creation_time   : 2019-03-14T16:46:55.000000Z
  Duration: 00:41:20.29, start: 0.000000, bitrate: 6430 kb/s
    Stream #0:0: Video: h264 (Main), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
    Metadata:
      BPS-eng         : 5788926
      DURATION-eng    : 00:41:20.020000000
      NUMBER_OF_FRAMES-eng: 59461
      NUMBER_OF_BYTES-eng: 1794581562
      _STATISTICS_WRITING_APP-eng: mkvmerge v31.0.0 ('Dolores In A Shoestand') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2019-03-14 16:46:55
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:1(eng): Audio: eac3, 48000 Hz, 5.1(side), fltp, 640 kb/s (default)
    Metadata:
      title           : English
      BPS-eng         : 640000
      DURATION-eng    : 00:41:20.288000000
      NUMBER_OF_FRAMES-eng: 77509
      NUMBER_OF_BYTES-eng: 198423040
      _STATISTICS_WRITING_APP-eng: mkvmerge v31.0.0 ('Dolores In A Shoestand') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2019-03-14 16:46:55
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:2(eng): Subtitle: subrip
    Metadata:
      BPS-eng         : 80
      DURATION-eng    : 00:40:22.295000000
      NUMBER_OF_FRAMES-eng: 645
      NUMBER_OF_BYTES-eng: 24473
      _STATISTICS_WRITING_APP-eng: mkvmerge v31.0.0 ('Dolores In A Shoestand') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2019-03-14 16:46:55
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:3(eng): Subtitle: subrip
    Metadata:
      title           : SDH
      BPS-eng         : 86
      DURATION-eng    : 00:40:31.012000000
      NUMBER_OF_FRAMES-eng: 709
      NUMBER_OF_BYTES-eng: 26142
      _STATISTICS_WRITING_APP-eng: mkvmerge v31.0.0 ('Dolores In A Shoestand') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2019-03-14 16:46:55
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Output #0, srt, to 'test6.srt':
  Metadata:
    encoder         : Lavf57.83.100
    Stream #0:0(eng): Subtitle: subrip
    Metadata:
      BPS-eng         : 80
      DURATION-eng    : 00:40:22.295000000
      NUMBER_OF_FRAMES-eng: 645
      NUMBER_OF_BYTES-eng: 24473
      _STATISTICS_WRITING_APP-eng: mkvmerge v31.0.0 ('Dolores In A Shoestand') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2019-03-14 16:46:55
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Stream mapping:
  Stream #0:2 -> #0:0 (copy)
Press [q] to stop, [?] for help
size=      46kB time=00:40:36.68 bitrate=   0.2kbits/s speed=11.6x    
video:0kB audio:0kB subtitle:24kB other streams:0kB global headers:0kB muxing overhead: 94.438766%


  


• .MKV to .MP4 choosing the audio and subtitles ?

  11 décembre 2016, par Leo Letto

  The following stream belongs to a .mkv file with dual audio ;

  Stream #0:0: Video: h264 (High), yuv420p(progressive), 1280x960 [SAR 1:1 DAR 4:3], 29.97 fps, 29.97 tbr, 1k tbn, 59.94 tbc (default)
  
  Stream #0:1(eng): Audio: mp3, 48000 Hz, stereo, s16p, 256 kb/s (default)
  
  Stream #0:2(por): Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
  
  Stream #0:3(eng): Subtitle: ass (default)

  Which ffmpeg command should I use to create an output with the language in Portuguese, already with the English subtitles ?

  I found some commands that can extract the language-based caption that I specify, but I didn’t find anything related to selecting the audio type.

  This is the entire output from ffmpeg :

  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55. 41.101 / 55. 41.101
  
    libavcodec     57. 66.108 / 57. 66.108
  
    libavformat    57. 58.101 / 57. 58.101
  
    libavdevice    57.  2.100 / 57.  2.100
  
    libavfilter     6. 67.100 /  6. 67.100
  
    libswscale      4.  3.101 /  4.  3.101
  
    libswresample   2.  4.100 /  2.  4.100
  
    libpostproc    54.  2.100 / 54.  2.100
  
  Input #0, matroska,webm, from 'mydualmkv.mkv':
  
    Metadata:
  
      title           : Avidemux
  
      encoder         : libebml v1.2.3 + libmatroska v1.3.0
  
      creation_time   : 2015-08-04T15:25:49.000000Z
  
    Duration: 00:23:37.44, start: 0.000000, bitrate: 1908 kb/s
  
      Stream #0:0: Video: h264 (High), yuv420p(progressive), 1280x960 [SAR 1:1 DAR 4:3], 29.97 fps, 29.97 tbr, 1k tbn, 59.94 tbc (default)
  
      Stream #0:1(eng): Audio: mp3, 48000 Hz, stereo, s16p, 256 kb/s (default)
  
      Stream #0:2(pot): Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
  
      Stream #0:3(eng): Subtitle: ass (default)
  
  [mp4 @ 0000000000c36700] track 1: codec frame size is not set
  
  Output #0, mp4, to 'path-to-output.mp4':
  
    Metadata:
  
      title           : Avidemux
  
      encoder         : Lavf57.58.101
  
      Stream #0:0: Video: h264 (High) ([33][0][0][0] / 0x0021), yuv420p(progressive), 1280x960 [SAR 1:1 DAR 4:3], q=2-31, 29.97 fps, 29.97 tbr, 16k tbn, 1k tbc (default)
  
      Stream #0:1(por): Audio: ac3 ([165][0][0][0] / 0x00A5), 48000 Hz, stereo, fltp, 192 kb/s
  
      Stream #0:2(eng): Subtitle: mov_text ([8][0][0][0] / 0x0008) (default)
  
      Metadata:
  
        encoder         : Lavc57.66.108 mov_text
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:2 -> #0:1 (copy)
  
    Stream #0:3 -> #0:2 (ass (ssa) -> mov_text (native))
  
  Press [q] to stop, [?] for help
  
  frame= 5451 fps=0.0 q=-1.0 size=   39273kB time=00:03:01.89 bitrate=1768.7kbits/s speed= 363x    
  
  frame=11708 fps=11695 q=-1.0 size=   79743kB time=00:06:30.62 bitrate=1672.3kbits/s speed= 390x    
  
  frame=17902 fps=11926 q=-1.0 size=  122134kB time=00:09:57.60 bitrate=1674.2kbits/s speed= 398x    
  
  frame=24717 fps=12352 q=-1.0 size=  166885kB time=00:13:44.83 bitrate=1657.4kbits/s speed= 412x    
  
  frame=31995 fps=12792 q=-1.0 size=  211010kB time=00:17:47.74 bitrate=1618.9kbits/s speed= 427x    
  
  frame=38979 fps=12988 q=-1.0 size=  260758kB time=00:21:40.64 bitrate=1642.4kbits/s speed= 433x    
  
  frame=42478 fps=13076 q=-1.0 Lsize=  286844kB time=00:23:37.31 bitrate=1657.9kbits/s speed= 436x    
  
  video:252490kB audio:33218kB subtitle:11kB other streams:0kB global headers:0kB muxing overhead: 0.393387%

• How to Compile FFmpeg with x264 and libfdk-aac for Android

  12 novembre 2016, par Codeveloper

  Everyone.

  Please understand that i use the wrong english.

  I want to make encoding application using FFmpeg.

  I was successfully building NDK with FFmpeg.

  However, to encode H.264 video made had failed( Codec not found.. ).

  I was learned that libx264 is need encode H.264 and libfdk-aac is need encode AAC.

  so I tried to build the libx264 and libfdk-aac, But does not easily cross-compile.

  Please tell me what I did wrong.

  My Development Environment

  OS : ubuntu 13.10 64bit

  NDK : android-ndk-r9

  FFmpeg : ffmpeg-2.0.2

  x264 build : build_x264_android.sh

  NDK=$ANDROID_NDK_HOME
  
  
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64
  
  PLATFORM=$NDK/platforms/android-9/arch-arm
  
  CPU=arm
  
  PREFIX=$NDK/sources/ffmpeg-2.0.2/android/$CPU
  
  
  
  ./configure --prefix=$PREFIX \
  
      --enable-shared \
  
      --enable-pic \
  
      --disable-asm \
  
      --disable-cli \
  
      --host=arm-linux \
  
      --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
  
      --sysroot=$PLATFORM
  
  
  
  make
  
  make install
  
  ldconfig

  fdk-aac build : build_aac_android.sh

  NDK=$ANDROID_NDK_HOME
  
  CROSS_PREFIX=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-
  
  PLATFORM=$NDK/platforms/android-9/arch-arm
  
  CPU=arm
  
  PREFIX=$NDK/sources/ffmpeg-2.0.2/android/$CPU
  
  OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=armv7-a -mthumb -D__thumb__"
  
  
  
  ./configure --prefix=$PREFIX \
  
      --with-sysroot=$PLATFORM \
  
      --host=arm-linux \
  
      --enable-shared \
  
      --with-pic=no \
  
      CC="${CROSS_PREFIX}gcc --sysroot=$PLATFORM" \
  
      CXX="${CROSS_PREFIX}g++ --sysroot=$PLATFORM" \
  
      RANLIB="${CROSS_PREFIX}ranlib" \
  
      AR="${CROSS_PREFIX}ar" \
  
      STRIP="${CROSS_PREFIX}strip" \
  
      NM="${CROSS_PREFIX}nm" \
  
      CFLAGS="-O3 $OPTIMIZE_CFLAGS --sysroot=$PLATFORM" \
  
      CXXFLAGS="-O3 $OPTIMIZE_CFLAGS --sysroot=$PLATFORM"
  
  
  
  make
  
  make install

  When I run ’build_aac_android.sh’, shown error.

  log in config.log

  configure:2907: checking for arm-linux-gcc
  
  configure:2934: result: /toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc --sysroot=/platforms/android-9/arch-arm
  
  configure:3203: checking for C compiler version
  
  configure:3212: /toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc --sysroot=/platforms/android-9/arch-arm --version >&5
  
  ./configure: line 3214: /toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc: No such file or directory
  
  configure:3223: $? = 127
  
  configure:3212: /toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc --sysroot=/platforms/android-9/arch-arm -v >&5
  
  ./configure: line 3214: /toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc: No such file or directory
  
  configure:3223: $? = 127
  
  configure:3212: /toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc --sysroot=/platforms/android-9/arch-arm -V >&5
  
  ./configure: line 3214: /toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc: No such file or directory
  
  configure:3223: $? = 127
  
  configure:3212: /toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc --sysroot=/platforms/android-9/arch-arm -qversion >&5
  
  ./configure: line 3214: /toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc: No such file or directory
  
  configure:3223: $? = 127
  
  configure:3243: checking whether the C compiler works
  
  configure:3265: /toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc --sysroot=/platforms/android-9/arch-arm -O3 -mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=armv7-a -mthumb -D__thumb__ --sysroot=/platforms/android-9/arch-arm   conftest.c  >&5
  
  ./configure: line 3267: /toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc: No such file or directory
  
  
  
  configure:3312: error: in `/home/nel/android-ndk-r9/sources/ffmpeg-2.0.2/libfdk-aac':
  
      configure:3314: error: C compiler cannot create executables
  
      See `config.log' for more details

  I cannot understand that error !! I was confirmed that arm-linux-androideabi-gcc is found in the directory..

  I want to borrow you wisdom. Please tell me how to ’ffmpeg+x264+fdk-aac’ build for android.

  Thanks.. :-)