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• ffmpeg : wmv files generated on Mac can't be played in Windows

  16 juin 2015, par TTZ

  On Mac OS X 10.6.8, I converted a animated gif to a video file in wmv (a requested file format) by using

  ffmpeg -i File.gif -s 400x400 NewFile.wmv

  The video file played fine using VLC on Mac.
  The file can’t be played on a Windows 7 machine using the Windows Media Player. Is there a way that I can save the animated gif as a WMV file that can be played using the Windows Media Player on a Windows 7 machine ?

  Many thanks for your time !

• How to download/convert multiple streams to multiple outputs with FFmpeg ?

  16 avril 2016, par Website Newbie

  Let’s say I have 20 different online stream videos (playlist.m3u8) and I want every video to output to their own .avi files. How can I do that in single file, so I don’t have to download and convert every single one separately ?

  I found a -map command online, but didn’t get straight answer to this.

  Will this be a working code ?

  ffmpeg -i 1playlist.m3u8 -vf scale=768:-1 -vcodec libx264 -crf 24 -acodec copy -map 0 1.avi \
  
  -i 2playlist.m3u8 -vf scale=768:-1 -vcodec libx264 -crf 24 -acodec copy -map 1 2.avi \
  
  -i 3playlist.m3u8 -vf scale=768:-1 -vcodec libx264 -crf 24 -acodec copy -map 2 3.avi

• Python running a cmd command(ffmpeg) with subprocess and wait for cmd to close before executing some code

  14 décembre 2019, par Fam

  So im using ffmpeg to resize a video, and this takes a little while so before the code continues i have to wait for the cmd to close. I havent been able to find a solution and i hope someone that actually knows their stuff can teach me a way. im probably just doing something retarded...
  Anyway i have tried multiple things like using subprocess.Propen() and then using pope() to see when it doesnt return "None" also tried stuff like subprocess.run() with subprocess.CompletedProcess() but i just cant get it to work could someone please care to explain if there is a way to do this and that im just doing it wrong ? :)

  Here is an example of what I tried

  p = subprocess.Popen("start ffmpeg -y -i "+DIR+"/post.mp4 -vf scale="+str(nW)+":"+str(nH)+" "+DIR+"/post_r.mp4", shell=True)
  
      while p.poll() is None:
  
          time.sleep(1)
  
          print("alive")
  
      else:
  
          print("cmd exited")

  Also whenever i put shell=False it just breaks instantly and I get this error :
  FileNotFoundError : [WinError 2] The system cannot find the file specified