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• MLT Framework Target GPU

  10 janvier 2024, par nooobeee

  I have a laptop with both an AMD iGPU and an AMD dedicated GPU and I'm using shotcut which apparently uses the MLT Framework. It seems like shotcut is using the iGPU for HW acceleration based on encoding times. I can specify a target device in ffmpeg using the "hwaccel_device" parameter and it appears that shotcut has an option for passing parameters to MLT.

  


  Is there a parameter that I can pass to MLT in order to specify the target gpu for ffmpeg to use ? I guess I'm looking for the MLT equivalent to ffmpeg's "-hwaccel_device /dev/dri/renderD129"

  


• glreadpixels is slower than x11 based screenshot

  23 décembre 2013, par quartz

  I am working on an opengl based simulation application, in which I need to make multiple screenshots in a second. I have tried 2 ways of doing it in my application.
  1) use glreadpixels
  2) use x11 based screenshot. ex : ffmpeg -f x11grab -s 1024x768 -i :0.0 output.png

  I found that second solution is about 3 times faster than first one. I have expected the first solution to be faster. But in practice it is slower. I am curious why glreadpixels is slower ?

• FFMPEG - No such filter 'minterpolate'

  18 juillet 2017, par Eduardo Perez

  So, I am trying to run a command in FFMPEG to do motion interpolation, and this is what happens.

  ffmpeg -i '드래곤빌리지 에피소드 영상 2화 (공식)-CYOxGwLy4mk.mkv' -filter "minterpolate='fps=60'" 60fps.mp4

  First I run the above command to encode a video, and I get the following output :

  ffmpeg version 2.8.11-0ubuntu0.16.04.1 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --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-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --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-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  
    WARNING: library configuration mismatch
  
    avcodec     configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --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-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --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-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv --enable-version3 --disable-doc --disable-programs --disable-avdevice --disable-avfilter --disable-avformat --disable-avresample --disable-postproc --disable-swscale --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libvo_aacenc --enable-libvo_amrwbenc
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, matroska,webm, from '드래곤빌리지 에피소드 영상 2화 (공식)-CYOxGwLy4mk.mkv':
  
    Metadata:
  
      COMPATIBLE_BRANDS: iso6avc1mp41
  
      MAJOR_BRAND     : dash
  
      MINOR_VERSION   : 0
  
      ENCODER         : Lavf56.40.101
  
    Duration: 00:04:02.60, start: 0.007000, bitrate: 1341 kb/s
  
      Stream #0:0(und): Video: h264 (Main), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
  
      Metadata:
  
        CREATION_TIME   : 2015-09-11 04:20:30
  
        LANGUAGE        : und
  
        HANDLER_NAME    : VideoHandler
  
        DURATION        : 00:04:02.576000000
  
      Stream #0:1(eng): Audio: opus, 48000 Hz, stereo, fltp (default)
  
      Metadata:
  
        LANGUAGE        : eng
  
        DURATION        : 00:04:02.601000000
  
  File '60fps.mp4' already exists. Overwrite ? [y/N] y
  
  [AVFilterGraph @ 0x1b86240] No such filter: 'minterpolate'
  
  Error opening filters!

  How can I fix this error ? I am running Linux Mint 18.2 Cinnamon.