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• Getting file info with ffmpeg, object file recognized as Audio ?

  20 décembre 2018, par cpl

  I’m testing a C++ program that should iterate in a directory and find all multimedia files. I used an iteration routine, and for every file I tried using the libav functions to open the file, such as av_find_stream_info in order to find stream info. It works fine for multimedia files, such as video and images, but the problem is that it recognizes some files as audio or video, for example it sees an audio stream inside a .o file ! I also tried to use av_read_frame and it worked fine, without errors ! I would like to avoid filtering by extension, is there any other solution to find "playable" files ?

  Thanks

• ffmpeg command convert a part of video file to an audio file [migrated]

  3 décembre 2013, par Amarnath alias Roobal

  I have a video file (duration 1 hour). I need any part of video file(30 min) to be converted to audio file

  ffmpeg -ss 00:30:00 -t 01:00:00 -i /opt/a.mp4 -vcodec copy -acodec copy /opt/b.mp4

  then i used

  ffmpeg -ss 00:30:00 -t 01:00:00 -i /opt/a.mp4 -acodec copy /opt/b.mp4

  But still I can view the video along with the audio. I need only audio files

• Automatically match output file with input file (Applescript x FFMPEG)

  2 mars 2018, par Wallie

  I use the following AppleScript as an Automator Service to right click a video file in the finder and burn in a matching subtitle file (.ass) with an ffmpeg terminal command. In this case ffmpeg encodes a new Prores 422(HQ) file.

  on run {input, parameters}
  
  tell application "Terminal"
  
      activate
  
      set filesString to ""
  
      repeat with file_ in input
  
          set filesString to filesString & " " & quoted form of (POSIX path of file_)
  
      end repeat
  
      do script "for f in" & filesString & "; do  
  
  base=$f  
  
  ffmpeg -y -i \"$base\" -c:v prores -profile:v 3 -pix_fmt yuv422p10le -vf \"ass=${base%.*}.ass\" -c:a copy \"${base%.*}_sub.mov\";
  
  done"
  
      end tell
  
      return input
  
  end run 

  Would it be possible to automatically match the output file and it’s codec to the input file ?
  We use a lot of different input formats due to a mixed windows / mac environment (Prores (mov), dnxhr (mxf/mov)) and I would like to not have 8-12 encoding options in the finder service menu’s of the workstations :).

  Thanks in advance !!