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• Python - ffmpeg-like media seeking with requests

  8 janvier 2017, par Will

  Using ffmpeg, times in HTTP media resources, such as videos, can be seeked to very quickly with a command like ffmpeg -ss 00:01:00 -i https://example.com/video.mp4, presumably by downloading the video headers to look for the right byte offset. This means that it is very fast to run operations on a section of video, even if it is hours in.

  What I want to be able to do is to do the same thing but piping into ffmpeg with the requests module with something like (in partial pseudo-code) :

  stream = requests.get(url, stream=True)
  
  start_byte = get_byte_offset(stream, time=60)
  
  stream.seek_to(start_byte)
  
  
  
  process = subprocess.Popen(["ffmpeg", "-i" "pipe:" "out.mp4"], stdin=subprocess.PIPE)
  
  
  
  for chunk in stream.iter_content(chunk_size=64 * 2 ** 10):
  
      process.stdin.write(chunk)
  
  process.stdin.close()

  This would allow me to implement extra checks into the stream that I would normally need to parse ffmpeg for, such as if the stream returns a bad status code such as 404 or 403.

  How might I be able to implement this using the requests, and presumably other, modules ? I suppose the first part is using a tool to parse the video headers.

• Use ffmpeg to cut out the first chapter

  7 janvier 2017, par UnR34L

  I’m trying to remove the first chapter of a TV show rip. The idea is to have something similar to netflix, where the first episode will show the intro then the consecutive episodes don’t.

  I’ve been getting the chapter time with ffprobe then doing it manually with this

  for %%A IN (*.mp4) DO ffmpeg -ss <chaptertime> -i "%%A" -vcodec copy -acodec copy "tmp.mp4" &amp;&amp; DEL "%%A" &amp;&amp; RENAME "tmp.mp4" "%%A"
  
  </chaptertime>

  How do I pass the first chapter time code value so ffmepg knows where to seek to ?

  Also hoping to use the same the same value to offset the subtitles so they align after the cut.

  Note : The machine I’ve doing the cutting on is windows but I can use my FreeBSD server if that’s easier.

• how can i record sound with ffmpeg with electron ?

  10 février 2023, par korayaggul

  I'm trying to record sound with electron using ffmpeg but I've never done it before, how can I do it ?

  


  need to run this code

  


  ffmpeg -loglevel debug -f avfoundation -i none:1 -f avfoundation -i none:2 -filter_complex amix=inputs=2:duration=first:dropout_transition=3 out.mk