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• How to pass options to ffmpeg from SoX ?

  17 janvier 2018, par beardedlinuxgeek

  I’m trying to combine and encode some files from wav to m4a. I installed both ffmpeg and sox from source to make sure nothing was disabled. When I do the conversion with ffmpeg

  ffmpeg -i input.wav -acodec aac -strict experimental output.m4a

  it works fine. When I use SoX

  sox input.wav output.m4a

  I get the error

  [NULL @ 0x251b4e0] Codec is experimental but experimental codecs are not enabled, see -strict -2
  
  sox FAIL ffmpeg: ffmpeg could not open CODEC
  
  sox FAIL formats: can't open output file `output.m4a':

  I need to way to get SoX to tell ffmpeg that its ok to use the experimental codecs.

  Also I already tried using this guide http://ffmpeg.org/trac/ffmpeg/wiki/UbuntuCompilationGuide to install the fdk-acc encoder, but it didn’t work. The experimental one works fine so I’d rather just use that.

• How to use AMD Radeon Pro W7800 to its full potential [closed]

  27 septembre 2023, par dkalna

  I have AMD Radeon Pro W7800 graphics card in my Windows 11 machine and want to convert MOV-files (which are between 12 and 15 GB big) to something more suitable (smaller). The AMD website states that supported rendering formats are following :

  


  

  • 2x Encode (H265/HEVC, 4K H264)

  


  • 2x Decode (H265/HEVC, 4K H264)

  


  • 1x Encode & Decode (AV1)

  


  


  For the conversion I would like to use FFmpeg. On the FFmpeg website (https://trac.ffmpeg.org/wiki/HWAccelIntro) I have seen different APIs and implementation status, but none of that make sense for me.

  


  Can someone point me in the right direction ? I would like to make files reasonable smaller (at least 50%) and would like to make the conversion fast (to use my graphics card to its full potential).

  


• FFmpeg framerate parameter

  24 avril 2020, par mentalmushroom

  I am confused by the FFmpeg framerate parameter. As far as I understand the docs and wiki, it sets the number of frames per second for the input (and the output unless -r option is specified). In fact, when I set the framerate to 1, the video is being played pretty much at its normal speed (25-30, but definitely not 1 frame per second as expected). Setting framerate to 2 makes it play around twice as fast (not 2 frames per second).

  



  To give a little bit more details, there is a python script which reads a video sample frame-by-frame as fast as it can and outputs these frames immediately to FFmpeg :

  



  python main.py -i myvideo.mp4 | ffmpeg -v warning -f rawvideo -pixel_format bgr24 -video_size 768x432 -framerate 2 -i - http://0.0.0.0:3004/fac.ffm


  



  What could be the reason for such behavior ?