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• Stream real-time (video+audio) via WebRTC (TCP) with chromakey && webm, best practices - how ? [on hold]

  18 octobre 2018, par Kirill K

  Please tell us about the best practics in your opinion for the case described below.
  Are there any hardware solutions for this case ?

  I want to get the real-time stream from the ip camera, overlay a chromakey, transcode into the necessary codecs (VP8 + opus), and distribute stream via webrtc over tcp to many users with some kind of authentication, for example, via a dynamic token.
  The delay from real time should be minimal.
  The solution should be stable (do not fall after 1 hour or 24 hours).

  Now I have decided on such a solution, but the time costs are too high (delay from real-time strem), maybe there you will offer be a more elegant solution :

  1. IP Camera (h264 + aac)
  2. FFmpeg (transcoding to VP8\OPUS + chromakey)
  3. FFserver (pack to rtp (for webcallserver))
  4. WebCallServer (WebRTC)

  I tried the following solutions :

  • Flussonic - missing WebRTC via TCP
  • Wowza (written in java) - crashes, support could not say the exact reasons, talked for more than 2 months, tested on different servers in different Data Centres

• python with ffmpeg fails randomly

  8 juillet 2017, par Jim Weisbin

  Python 2.7.1 on Mac OS X 10.12.5, ffmpeg 3.3.2 (installed with Brew).

  I’m calling ffmpeg on a loop though thousands of Apple Lossless files, converting to mp3 and tagging as I go. Here’s the call :

  thecall = '/usr/local/bin/ffmpeg -hide_banner -loglevel error -i ' + <path to="to" m4a="m4a" file="file"> + ' -i ' + <path to="to" artwork="artwork"> + ' -map 0:0 -map 1:0 -id3v2_version 3 -map_metadata -1 -metadata album="xxx" -metadata artist="xxx" -metadata comment="Cover (Front)" -f mp3 -b:a 128K ' + <path to="to" mp3file="mp3file">'
  
  
  
  os.system(thecall)
  
  </path></path></path>

  this works perfectly from the command line, and also works from Python most of the time, but randomly fails with the message

  [alac @ 0x7fc888858800] invalid samples per frame: 0
  
  Error while decoding stream #0:0: Invalid data found when processing input

  What’s strange is that on the files it failed on, if I run it from the command line it succeeds. I tried putting in time.sleep(5) but no change. And the failures are not always on the same file, so it seems like it’s a memory or threading issue. I also tried calling with subprocess() instead, no change.

  Any help would be appreciated.

• ffmpeg called from python random failure

  9 juillet 2017, par Jim Weisbin

  Python 2.7.1 on Mac OS X 10.12.5, ffmpeg 3.3.2 (installed with Brew).

  ffmpeg is called in a loop though thousands of Apple Lossless files, converting to mp3 and tagging.

  thecall = '/usr/local/bin/ffmpeg -hide_banner -loglevel error -i ' + <path to="to" m4a="m4a" file="file"> + ' -i ' + <path to="to" artwork="artwork"> + ' -map 0:0 -map 1:0 -id3v2_version 3 -map_metadata -1 -metadata album="xxx" -metadata artist="xxx" -metadata comment="Cover (Front)" -f mp3 -b:a 128K ' + <path to="to" mp3file="mp3file">'
  
  </path></path></path>

  os.system(thecall)

  this works perfectly from the command line, and also works from Python most of the time, but randomly fails with the message

  [alac @ 0x7fc888858800] invalid samples per frame : 0
  Error while decoding stream #0:0 : Invalid data found when processing input

  What’s strange is that on the files it failed on, if I run it from the command line it succeeds. I tried putting in time.sleep(5) but no change. And the failures are not always on the same file, so it seems like it’s a memory or threading issue. I also tried calling with subprocess() instead, no change.

  Any help would be appreciated.