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• Convert audio download with youtube-dl to flac ?

  28 janvier 2020, par Urasam

  Is it possible to download a YouTube video as e.g. mp3 and then convert it to flac with ffmpeg ? I can specify the arguments that ffmpeg shall use after the download with —postprocessor-args but I don’t know how to get the file name there.

  --postprocessor-args "-i downloadedfile.xxx -c:a flac downloadedfile.flac"

  This would be the argument I want to use. Is this possible ?

• Convert TIFF images sequence to lossless movie FFMPEG

  9 janvier 2016, par Rarez

  I would like use a h265 codec(FPS must be equal to 25) to save loseless wideo from sequence of TIFF images. I have a problem with save it. I supose that it is little mistake. I tried many combinactions of commands here is last one :

  ffmpeg -f image2 -r $FRAMERATE -i IMG_%03d.tif -vcodec libx265 -x265-params lossless movie.mp4

  And output :

  [libx265 @ 0x2bcaf40] 4:2:2 and 4:4:4 support is not fully defined for HEVC yet. Set -strict experimental to encode anyway.
  
  Output #0, mp4, to 'movie.mp4':
  
      Stream #0:0: Video: hevc, none, q=2-31, 128 kb/s, SAR 1:1 DAR 0:0, 25 fps
  
      Metadata:
  
        encoder         : Lavc57.20.100 libx265
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (tiff (native) -> hevc (libx265))
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  I will be very glad for any help. Thanks

• FFMPEG : Fixing frame rate with filter_complex movie filter

  4 mai 2018, par stevendesu

  With some help from @Gyan I came up with the following FFMPEG command which streams 4 videos simultaneously to 4 separate RTMP endpoints, looping the videos infinitely and keeping the audio and video synchronized :

  ffmpeg \
  
      -filter_complex \
  
          "movie=01.mp4:loop=0[v1];[v1]setpts=N/FRAME_RATE/TB[v1];
  
           amovie=01.mp4:loop=0[a1];[a1]asetpts=N/SR/TB[a1];
  
           movie=02.mp4:loop=0[v2];[v2]setpts=N/FRAME_RATE/TB[v2];
  
           amovie=02.mp4:loop=0[a2];[a2]asetpts=N/SR/TB[a2];
  
           movie=03.mp4:loop=0[v3];[v3]setpts=N/FRAME_RATE/TB[v3];
  
           amovie=03.mp4:loop=0[a3];[a3]asetpts=N/SR/TB[a3];
  
           movie=04.mp4:loop=0[v4];[v4]setpts=N/FRAME_RATE/TB[v4];
  
           amovie=04.mp4:loop=0[a4];[a4]asetpts=N/SR/TB[a4]" \
  
      -map "[v1]" -map "[a1]" \
  
          -c:a libfdk_aac \
  
          -c:v libx264 -preset ultrafast \
  
          -b:v 500k -b:a 32k \
  
          -f flv rtmp://output/01 \
  
      -map "[v2]" -map "[a2]" \
  
          -c:a libfdk_aac \
  
          -c:v libx264 -preset ultrafast \
  
          -b:v 500k -b:a 32k \
  
          -f flv rtmp://output/02 \
  
      -map "[v3]" -map "[a3]" \
  
          -c:a libfdk_aac \
  
          -c:v libx264 -preset ultrafast \
  
          -b:v 500k -b:a 32k \
  
          -f flv rtmp://output/03 \
  
      -map "[v4]" -map "[a4]" \
  
          -c:a libfdk_aac \
  
          -c:v libx264 -preset ultrafast \
  
          -b:v 500k -b:a 32k \
  
          -f flv rtmp://output/04

  This is almost perfect, except that it’s doubling my frame rate :

  frame=20822 fps= 46 q=32.0 q=34.0 q=29.0 q=32.0 size=   57617kB time=00:14:28.39 bitrate= 543.5kbits/s speed=1.92x

  Note the speed=1.92x bit. This is causing the live stream to play at double speed, as well.

  (the original video was approximately 24 fps)