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• my own tv news channel - using vlc streaming

  6 janvier 2015, par SledgehammerPL

  I want to create my own tv channel (using vlc streaming).
  And for now - it works great :

  cvlc --sout-keep --loop --sout '#standard{access=http,mux=ts,dst=:2000}' file.avi

  But i have two problems :

  1st : how to make a playlist, which i can modify without breaking the streaming (I thought about playlist with file1.avi- file10.avi, which all are symlinks, so when i’m sure, that file2 is playing, I can change symlink for file1 -but maybe there is something beter ?
  2ns : I want to add logo, and news ticker - adding logo is quite easy, but ticker looks hard : for now i know, that I have to use transcode sfilter, something like

  cvlc  --sout-keep --loop --sout '#transcode{soverlay, sfilter=marq{marquee="$N$_$T$_$D", position=5, size=14, opacity=255}, vb=600, vcodec=h264, venc=x264{bpyramid=none, weightp=0}}:standard{access=http,mux=ts,dst=:2000}' film.mp4

  but the problem is that ticker doesn’t move - it changes, but not move

  And I think if I can add logo twice - with ticker between logos - i think about layers :
  1. movie
  2. ticker background
  3. ticker text
  4. ticker frame (because i don’t want to scroll text from border to border)

  Any ideas ?

• Error in av_write_frame when streaming over network (libavformat of ffmpeg)

  4 décembre 2014, par user4324788

  I have been using the ffmpeg libraries (libavcodec, libavformat, etc.) in my C# application to encode buffer data retrieved from my camera/microphone (using DirectShow.Net) and stream it over the network to a destination IP address using MPEG-TS and UDP.

  I communicate with the C++ libraries of ffmpeg through a C# wrapper (.dll) which I call with DllImport. I send the raw video and audio buffer data from C# to the C++ libraries for the purpose of encoding, muxing, and streaming.

  The encoding and streaming works perfectly, however I sometimes seem to encounter a problem with the “av_write_frame” function which is used to write the encoded packet to the output media. After a seemingly random period of time, the following line produces an error ("oc" being the AVFormatContext and "pkt" being the AVPacket) :

  av_write_frame(oc, &pkt)

  One of two errors occurs :

  • An I/O error is returned (return value -5).
  • A ’System.AccessViolationException’ (Attempted to read or write protected memory. This is often an indication that other memory is corrupt.) is thrown.

  This error sometimes occurs after a few minutes of streaming, other times after a much longer period (up to 20 minutes). Also, this error occurs at both video and audio encoding/writing, so I haven’t been able to pinpoint the exact reason behind this problem. Unfortunately it always results in my application either crashing or the streaming to stop working.

  I have tried catching the AccessViolationException, which sometimes allows the application to continue for a little longer, but eventually it ends up exiting without any warning.
  In case of the I/O error, I can reset my application, but eventually it still crashes.

  Any help with fixing this issue would be greatly appreciated !

  Thank you very much in advance.

• HLS Variable bit rate streaming on Linux

  27 novembre 2015, par khalidcawl

  I want to stream VOD or LIVESTREAM from my computer to another computer on the same network using HLS. I have already learnt how to segment the files, create the m3u8 index file and stream from the apache2 server to VLC. However, I can’t figure out how to create streams with different bitrates and then allow VLC to stream from the apache2 server. So far, I did the segmentation with ffmpeg and VLC as well. But how do I create different versions (in terms of quality) of the same video and then stream it using HLS ?.

  I need this for a project that I am doing on adaptive bitrate streaming. I can successfully stream only the original video (segmented of course). Do I have to manually create each bitrate quality ? If yes, then how ?

  I would appreciate any help. Thanks.