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• Setting up multi webcam streaming

  28 septembre 2013, par Moritz Mädler

  we are currently planning to connect all our offices via webcams selectable from a website. So I guess the setup could be something like this :

  Webcam 1 \
  
  Webcam 2 - > Streamserver -> Webserver displaying html5 Video 
  
  Webcam n /

  I've made first tests from streaming from Windows using VLC to a central ffserver, but the results where rather bad (after 1-2 frames the stream stopped).

  Do you have any suggestions on
   which stream software I can use on the client/webcam site (Linux or Windows)
   which software I can use on the server side (Linux) for collecting and recoding streams ?

  Thanks,

  Moritz

• Error while streaming using ffserver

  4 septembre 2013, par Nani

  I am trying to stream a combined/stitched video using ffserver and getting an error "Feed '/tmp/feed1.ffm' stream number does not match registered feed"

  Here is what I am doing
  1) grab screen 1 & 2 using ffmpeg x11grab option
  2) Stitch them using ffmpeg -filter_complex option
  3) Stream the stitched video using the ffserver.

  Instead of streaming if I redirect the ffmpeg stitched output to a file I dont see any issue.

• Remux and segment only parts of a video file without difference in output

  20 juin 2013, par Christian P.

  I have a working program built on top of libav (alternatively ffmpeg - expertise is either is useful here).

  It takes an mp4 video, encoded with h264 video / AAC audio, and remuxes it to MPEG TS and segments it into X second chunks. It is analogous to the following ffmpeg command :

  ffmpeg -y -i video.mp4 -c:a copy -bsf:a aac_adtstoasc -c:v copy -bsf:v h264_mp4toannexb -flags -global_header -map 0 -f segment -segment_time 10 -segment_list playlist.m3u8 -segment_format mpegts chunk_%03d.ts

  The reason I am not using the command-line, is that I wish to generate only a subset of the segments. So if a video results in 10 segments of between 8 and 12 seconds (the segments are never exactly the desired length due to keyframes), I might wish to generate segments 3-7 at a later time.

  The complete code for my program can be found here.

  I use av_read_frame to read every frame from the source file, remux (including a bitfilter process) and write to output file. Once the duration since the last output becomes close/greater than the desired segment length, I flush the output file, close it, open the next segment and continue.

  I have tried altering the code to do an av_seek_frame to the end of the first segment and start from there (I also attempted to start at the end of the 2nd and 3rd segment). The new segments are the same length (in seconds and pts), but have a different size than the comparable segments from the full runthrough (within a few kilobytes) - the starting segment (whether it's the 2nd, 3rd or other) also shows as having 2 packets LESS than the comparable segment from previously.

  I assumed that av_seek_frame would give me an exact match as if I had manually done a loop with av_read_frame up to that frame, but it seems like it's not the case.

  What I wish for :

  • A way to "fast-forward" in the file to a specific (not approximate) point in the file.
  • To write from that point forward and have the output be completely identical to the output a full run provides (same size, same length, same exact bytes).