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• FFMPEG get stuck when transcoding too many FLAC audios [closed]

  6 juin 2024, par user25436721

  I'm currently using Editly for create some videos from code, but there are some bugs with ffmpeg(latest).

  


  Nothing returns after hours processing(460 audios files during test), I already tried with flac, aac, libshine and libmp3lame encoders, already tried a different a ffmpeg version(static).

  


  From the editly code, I already changed the ffmpeg query, slicing in chunks(75), the results were :

  


  

  • 0, 75 ok

  


  • 0, 80 stuck

  


  • 75, 150 ok

  


  • 150, 225 ok

  


  • 225, 300 stuck

  


  • 300, 375 ok

  


  • 375, 450 ok

  


  


  Stuck screen(directly from terminal) :

  


  built with gcc 13 (Ubuntu 13.2.0-23ubuntu4)
  configuration: --pkg-config-flags=--static --prefix='~/ffmpeg/dyn' --extra-cflags='-I/~/ffmpeg/dyn/include' --extra-ldflags='-L/~/ffmpegffmpeg/dyn/lib' --bindir='~/ffmpeg/dyn/bin' --enable-debug=3 --enable-vaapi --enable-libvorbis --enable-libvpx --enable-gpl --cpu=native --enable-opengl --enable-libfdk-aac --enable-libx264 --enable-nonfree --enable-libmp3lame --enable-libshine
  libavutil      59. 21.100 / 59. 21.100
  libavcodec     61.  6.100 / 61.  6.100
  libavformat    61.  3.104 / 61.  3.104
  libavdevice    61.  2.100 / 61.  2.100
  libavfilter    10.  2.102 / 10.  2.102
  libswscale      8.  2.100 /  8.  2.100
  libswresample   5.  2.100 /  5.  2.100
  libpostproc    58.  2.100 / 58.  2.100

Input #n..., flac, from 'editly-tmp-.../clip...-audio.flac':
  Metadata:
    encoder         : Lavf61.3.104
  Duration: 00:01:53.62, start: 0.000000, bitrate: 1 kb/s
  Stream #458:0: Audio: flac, 48000 Hz, stereo, s32 (24 bit)
Stream mapping:
  Stream #n1:0 (flac) -> acrossfade
  Stream #n2:0 (flac) -> acrossfade
  Stream #n3:0 (flac) -> acrossfade
  Stream #n...:0 (flac) -> acrossfade
  acrossfade:default -> Stream #0:0 (libshine)
  Press [q] to stop, [?] for help


  


  if I quit then returns :

  


  [fc#0 @] [ao0->#0:0 @] No filtered frames for output stream, trying to initialize anyway.
Output #0, mp3, to 'editly-tmp-.../audio-concat.mp3':
  Metadata:
    TSSE            : Lavf61.3.104
  Stream #0:0: Audio: mp3, 48000 Hz, stereo, s16p, 128 kb/s
      Metadata:
        encoder         : Lavc61.6.100 libshine
[out#0/mp3 @ 0x60633b423480] video:0KiB audio:0KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: unknown
[out#0/mp3 @ 0x60633b423480] Output file is empty, nothing was encoded(check -ss / -t / -frames parameters if used)
size=       0KiB time=N/A bitrate=N/A speed=N/A    


  


  Editly code for generating FFMPEG query :

  


      let inStream = '[0:a]';
    const filterGraph = clipAudio.slice(0, -1).map(({ transition }, i) => {
      const outStream = `[concat${i}]`;

      const epsilon = 0.0001; // If duration is 0, ffmpeg seems to default to 1 sec instead, hence epsilon.
      let ret = `${inStream}[${i + 1}:a]acrossfade=d=${Math.max(epsilon, transition.duration)}:c1=${transition.audioOutCurve || 'tri'}:c2=${transition.audioInCurve || 'tri'}`;

      inStream = outStream;

      if (i < clipAudio.length - 2) ret += outStream;
      return ret;
    }).join(',');

    const args = [
      ...getFfmpegCommonArgs({ enableFfmpegLog }),
      ...(flatMap(clipAudio, ({ path }) => ['-i', path])),
      '-filter_complex',
      filterGraph,
      '-c', 'flac',
      '-y',
      outPath,
    ];
    await execa(ffmpegPath, args);


  


  FFMPEG query structure :

  


  ffmpeg -i /editly-tmp-.../clip000-audio.flac -i /editly-tmp-.../clip226-audio.flac -i ... -filter_complex [0:a][1:a]acrossfade=d=1:c1=tri:c2=tri[concat0],[concat0][2:a]acrossfade=d=0.425:c1=tri:c2=tri[concat1],[concat1][3:a]acrossfade=d=0.425:c1=tri:c2=tri[concat2],... -c flac -y /editly-tmp-.../audio-concat-3.mp3


  


  My hardware :

  


  Ubuntu 24.04 LTS
AMD Ryzen™ 5 5600G
Only 8gb(the other slot is broken)
AMD Radeon™ RX 580 2048SP


  


  Sorry my poor english :P

  


  Change Codecs, FFMPEG version, node version, slice the files in chunks, change SO(worked in Windows).

  


• avcodec/bitpacked_dec : optimize bitpacked_decode_yuv422p10

  5 mai 2023, par Devin Heitmueller

  avcodec/bitpacked_dec : optimize bitpacked_decode_yuv422p10
  Rework the code a bit to speed up the 10-bit bitpacked decoding
  
  routine.  This is probably about as fast as I can get it without
  
  switching to assembly language.
  Demonstratable with :
  ./ffmpeg -f lavfi -i "smptehdbars=size=3840x2160" -c bitpacked -f image2 -frames:v 1 source.yuv
  
  ./ffmpeg -f bitpacked -pix_fmt yuv422p10le -s 3840x2160 -c:v bitpacked -i source.yuv -pix_fmt yuv422p10le out.yuv
  On my development system, it went from 80ms for a 2160p frame
  
  down to 20ms (i.e. a 4X speedup).  Good enough for now, I hope...
  Comments from Marton :
  Originally on my system better performance could be achieved by simply
  
  switching to the cached bitstream reader, but for Devin it was slower than
  
  his direct byte operations.
  I changed the order of writing output from u/y/v/y to u/v/y/y, and that made
  
  the code faster than the cached bitstream reader on my system as well.
  TIMER measurement of the decode loop on Ryzen 5 3600 with command line :
  ./ffmpeg -stream_loop 256 -threads 1 -f bitpacked -pix_fmt yuv422p10le -s 3840x2160 -c:v bitpacked -i source.yuv -pix_fmt yuv422p10le -f null none -loglevel error
  Before : 823204127 decicycles in YUV,     256 runs,      0 skips
  
  After :  315070524 decicycles in YUV,     256 runs,      0 skips
  Signed-off-by : Devin Heitmueller <dheitmueller@ltnglobal.com>
  
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavcodec/bitpacked_dec.c

• ffmpeg opencl filters with nvenc encoding [closed]

  3 décembre 2023, par David Hajes

  I am trying to denoise HD video with GPU acceleration :

  


  ffmpeg.exe -init_hw_device opencl=gpu:0.0 -filter_hw_device gpu -i $FileBrowser.FileName -vf "hwupload, nlmeans_opencl=5:7:5:3:3, hwdownload, format=yuv420p" -c:v libx265 -c:a copy -crf 20 $f_output

  


  filtering is fast, but encode is slowed down by CPU Ryzen 9 5950X @ 4GHz + RTX 3060 Ti 1.8x

  


  I can also fast encode with cuda nvenc 5x on above by mentioned GPU without filtering

  


  ffmpeg.exe -hwaccel nvdec -init_hw_device cuda=cuda:0 -hwaccel_output_format cuda -i $FileBrowser.FileName -c:v hevc_nvenc -preset slow -tune hq -rc vbr_hq -b:v 6M -maxrate:v 12M -c:a copy -crf 20 $f_output

  


  Is there a way to combine opencl filtering & cuda encode on same GPU, please ?

  


  I tried to combine both together, but there is filter format=yuv420p error