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• ffmpeg : "invalid syntax" on file name ?

  26 novembre 2017, par Josh Flori

  I am trying to use this line of code in python :

  ffmpeg -i test.mp4 -vf fps=1 out%d.png

  per the documentation here https://trac.ffmpeg.org/wiki/Create%20a%20thumbnail%20image%20every%20X%20seconds%20of%20the%20video

  but python is giving me :

  File "<stdin>", line 1
  
  ffmpeg -i test.mp4 -vf fps=10 out%d.png
  
               ^
  
  SyntaxError: invalid syntax
  
  </stdin>

  I have imported ffmpeg and have my test.mp4 file exactly where I keep everything else python related. I have looked for a good while and am not sure what I am doing wrong, seems like it should be something simple ? Any ideas ?

  Thanks

• Merge mp3 files using FFmpeg on Android

  13 mai 2017, par Ali

  I am trying to merge two mp3 files using this command :

  ffmpeg -i "concat:/storage/emulated/0/Recordings/oneone.mp3|/storage/emulated/0/Recordings/twone.mp3" -c copy /storage/emulated/0/Recordings/concated.mp3

  but get this error :

  "concat:/storage/emulated/0/Recordings/oneone.mp3|/storage/emulated/0/Recordings/twone.mp3": No such file or directory

  Even though the both files exist in the directory. I have written this command according to the documentation : https://trac.ffmpeg.org/wiki/Concatenate#protocol

  How do I fix this ? Please help me.

• FFmpeg WebM AV1 Support

  6 septembre 2018, par Matt McManis

  With FFmpeg how can I use AV1 codec in a webm container ?

  I get the error :

  Only VP8 or VP9 video and Vorbis or Opus audio and WebVTT subtitles are supported for WebM.
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
  
  Error initializing output stream 0:0 --

  ---

  However Wikipedia says WebM supports AV1.

  https://en.wikipedia.org/wiki/AV1

  AV1 is intended to be able to be used together with the audio format Opus in a future version of the WebM container format for HTML5 web video

  Or can FFmpeg simply not encode this new version ?

  ---

  My settings :

  ffmpeg -y 
  
  
  
  -i "C:\Users\Matt\video.mp4" 
  
  
  
  -c:v libaom-av1 -strict experimental 
  
  -cpu-used 1 -crf 28 
  
  -pix_fmt yuv420p 
  
  -map 0:v:0? -map_chapters -1 
  
  -sn 
  
  
  
  -c:a libopus 
  
  -map 0:a:0? 
  
  
  
  -map_metadata 0 
  
  
  
  -f webm 
  
  
  
  -threads 0 
  
  
  
  "C:\Users\Matt\video.webm"