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• Can't list input devices ffmpeg linux

  23 juillet 2021, par spindi598

  On windows I could do something like this to list input devices :

  


  ffmpeg -list_devices true -f dshow -i dummy


  


  On Linux I try doing something like this :

  


  ffmpeg -list_devices true -f <x11grab></x11grab>avfoundation>&#xA;

  


  And I get an error (I have also tried the latest git build from here) :

  


  ffmpeg version n4.2.4 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.1.0 (GCC)
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avisynth --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-nvdec --enable-nvenc --enable-omx --enable-shared --enable-version3
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Unrecognized option 'list_devices'.
Error splitting the argument list: Option not found


  


  How can I list my input devices ?

  


• FFMPEG creates an empty gif when the start time (-ss) of the video is over 9 seconds ?

  30 décembre 2020, par blablubla12

  I'm running this command in node.js

  


  function CreateGif() {
    return new Promise((resolve, reject) => {
      const ffmpeg = spawn(ffmpegPath, [
        '-ss',
        '00:00:10.000',
        '-i',
        target,
        '-i',
        overlayTarget,
        '-filter_complex',
        `[0:v]trim=duration=5,setpts=PTS-STARTPTS,scale=450:-1[trimmed];[trimmed]split[trimmed1][trimmed2];[trimmed2]reverse[rev];[trimmed1][rev]concat=n=2:v=1:a=0[v];[v][1:v]overlay=0:0:format=rgb[overlayed];[overlayed]split[a][b];[a]palettegen=stats_mode=diff[palette];[b][palette]paletteuse=bayer:bayer_scale=3.5[out]`,
        '-map',
        '[out]',
        '-y',
        tempPath
      ]);

      ffmpeg.stderr.setEncoding('utf8');
      ffmpeg.stderr.on('data', (data) => {
        console.log(data);
      });

      ffmpeg.on('close', function (code) {
        console.log('closed');
        resolve();
      });

      ffmpeg.on('error', function (err) {
        console.log(err);
        reject();
        throw new Error(err);
      });
    });
  }


  


  If the start time -ss is 00:00:09.000 or anything less than 10 seconds, then it creates the correct gif. However if I put 00:00:10.000 or anything above, it creates an empty gif (0 bytes). The same command works when I run it through cmd. FFMPEG version is ffmpeg version N-55112-g7eb9cf593e-static https://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2020

  


  Note : The video (defined as target in the code) is 1:30 min long and overlayTarget is a png image.

  


• ffmpeg is failed to concatanate two different resolution videos [duplicate]

  25 octobre 2020, par Ramesh Jangama

  I am trying to cancatanate two differen resolution videos. I am getting below error which I am getting confused. However same command is working fine if I give same input file twice for concatation.

  


  command :

  


  ffmpeg -i C:\Users\oem\Downloads\FFMpeg_practice\test4.mp4 -i C:\Users\oem\Downloads\FFMpeg_practice\test_out3.mp4 -y -filter_complex "[0:v] scale=iw/2:ih/2 [v0];[1:v] scale=iw/2:ih/2 [v1];[v0][0:a][v1][1:a] concat=n=2:v=1:a=1 [v][a]" -preset superfast -crf  30  -ab  64k  -map  [v]  -map  [a]  C:\Users\oem\Downloads\FFMpeg_practice\diffmerge.mp4


  


  error :

  


  Stream specifier ':a' in filtergraph description [0:v] scale=iw/2:ih/2 [v0];[1:v] scale=iw/2:ih/2 [v1];[v0][0:a][v1][1:a] concat=n=2:v=1:a=1 [v][a] matches no streams.


  


  output :

  


  C:\ffmpeg\bin>ffmpeg -i C:\Users\oem\Downloads\FFMpeg_practice\test4.mp4 -i C:\Users\oem\Downloads\FFMpeg_practice\test_out3.mp4 -y -filter_complex "[0:v] scale=iw/2:ih/2 [v0];[1:v] scale=iw/2:ih/2 [v1];[v0][0:a][v1][1:a] concat=n=2:v=1:a=1 [v][a]" -preset superfast -crf  30  -ab  64k  -map  [v]  -map  [a]  C:\Users\oem\Downloads\FFMpeg_practice\diffmerge.mp4
ffmpeg version 2020-10-07-git-a086b73e1f-full_build-www.gyan.dev Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.2.0 (Rev3, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      56. 60.100 / 56. 60.100
  libavcodec     58.109.100 / 58.109.100
  libavformat    58. 61.100 / 58. 61.100
  libavdevice    58. 11.102 / 58. 11.102
  libavfilter     7. 87.100 /  7. 87.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\Users\oem\Downloads\FFMpeg_practice\test4.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.61.100
    location-eng    : +51.5831-000.3438/
    location        : +51.5831-000.3438/
  Duration: 00:00:39.50, start: 0.000000, bitrate: 1439 kb/s
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 540x960, 1304 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\Users\oem\Downloads\FFMpeg_practice\test_out3.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.61.100
    comment         : vid:v09044820000brrhju8biap950rr41k0
  Duration: 00:00:30.73, start: 0.000000, bitrate: 1287 kb/s
    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 288x512 [SAR 1:1 DAR 9:16], 281 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #1:1(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 288x512 [SAR 1:1 DAR 9:16], 243 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
    Metadata:
      handler_name    : VideoHandler
    Stream #1:2(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 576x1024 [SAR 1:1 DAR 9:16], 1018 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
    Metadata:
      handler_name    : VideoHandler
Stream specifier ':a' in filtergraph description [0:v] scale=iw/2:ih/2 [v0];[1:v] scale=iw/2:ih/2 [v1];[v0][0:a][v1][1:a] concat=n=2:v=1:a=1 [v][a] matches no streams.