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• FFMPEG - Could not find tag for codec pcm_s16le in stream #0, codec not currently supported in container

  27 juillet 2021, par Meggy

  I'm using the following command to extract part of a mono 44K .M4A audio file ;

  


   ffmpeg -ss 00:00:01 -i input.m4a -t 00:00:03 -c:a copy output.m4a 


  


  But I'm getting the following error ;

  


    Trailing option(s) found in the command: may be ignored.
  Guessed Channel Layout for Input Stream #0.0 : mono
  Input #0, wav, from 'input.m4a':
  Duration: 00:00:01.95, bitrate: 705 kb/s
  Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, mono, s16, 705 kb/s
  [ipod @ 00000222e439ca00] Could not find tag for codec pcm_s16le in stream #0, codec not currently supported in container
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
  Error initializing output stream 0:0 --
  Stream mapping:
  Stream #0:0 -> #0:0 (copy)


  


  I notice that FFMPEG guesses that my file is wav but this is strange as I thought it was .M4A . So is FFMPEG incorrectly guessing that my input is a wav file and hence creating an error ?

  


• Legal issues regarding proprietary_codecs in chromium (bundled with electron)

  4 juin 2021, par Manmohan Singh

  We're in the process of building and deploying a desktop based app on electron v 12.0.7. It'll be a (free) commercial software deployed to 2-3M users worldwide.
Recently our legal team enquired about the proprietary codecs bundled with chromium and I thought the best way to confirm this would be to reach out here.

  


  So, here're specific things that I need help with :

  


  


  1. Are we shipping chromium with proprietary codecs ? If yes, what are potentially contentious codecs that come by default in chromium bundled with electron v 12.0.7 ?

     


  


  2. Is there any documentation around how the electron team builds chromium (with what flags) ?

     


  


  3. Is the default libffmpeg.dylib/dll bundled with electron building ffmpeg with support for things like H.264 and MP3 codecs ?

     


  


  4. I noticed there are libffmpeg binaries available with each electron build, e.g. https://github.com/electron/electron/releases/download/v12.0.7/ffmpeg-v12.0.7-darwin-arm64.zip . What's the purpose of this binary ?

     


  


  


  Any help would be appreciated.

  


• Recording with python librtmp RTMP shrinks

  31 décembre 2022, par Yojuan

  The code for capturing a video stream using python librtmp is this :

  


  import librtmp

conn = librtmp.RTMP('rtmp://some_program', live=True)
conn.connect()
stream = conn.create_stream(update_buffer=True)
        
f = open("my_program.flv", 'wb')
while True:
    try:
        data=stream.read(1024)
        if data:
            f.write(data)
            f.flush()
    except:
        print("Error during stream")


  


  The duration of the program is of 1 hour, but when i play the video, the duration becomes in 59 min and 52 secs or 59 min and 56 secs.... but in the most cases the duration is 1 hour exactly.

  


  I noticed that the first record always is perfect but in some cases the second shrinks (when I use the function for second time or more)

  


  First I thought the problem was on ffmpeg because I use it to encode the video but it isn't because the video without encoding (the raw capture) shrinks anyway and i have other program that capture the same video with duration of 1 hour every time.

  


  What happens here ? I suppose that there is a buffer that is not being emptied correctly or something like that.