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• Stream mp4 file to multicast using ffmpeg ?

  17 décembre 2018, par Stuart

  I have a mp4 video with no sound that I want to stream to a multicast address on a loop, I can connect to the stream group to play but it’s just empty when I play in VLC but the timer in VLC changes as if something is playing.

  ffmpeg -re -stream_loop -1 -i testvideo.mp4 -s 640x480 -vcodec copy -f mpegts udp://238.100.100.1:1234

  I’ve also noticed that the size doesn’t seem to work either ?

  Any help would be great. Thanks

• sdp : Add an option for sending RTCP packets to the source of the last packets

  13 août 2013, par Martin Storsjö

  sdp : Add an option for sending RTCP packets to the source of the last packets
  An SDP description normally only contains the target IP address
  
  and port for the packets. This means that we don’t really have
  
  any clue where to send the RTCP RR packets - previously they’re
  
  sent to the destination IP written in the SDP (at the same port),
  
  which rarely is the actual peer. And if the source for the packets
  
  is on a different port than the destination, it’s never correct.
  With a new option, we can choose to send the packets to the
  
  address that the latest packet on each socket arrived from.
  
  — -
  
  Some may even argue that this should be the default - perhaps,
  
  but I’d rather keep it optional at first. Additionally, I’m not
  
  sure if sending RTCP RR directly back to the source is
  
  desireable for e.g. multicast.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavformat/rtsp.c
  • [DBH] libavformat/rtsp.h

• FFMPEG - Streaming multiple video files to RTMP server [closed]

  17 janvier 2021, par JackCisco

  I am using Ubuntu 20.0.4

  



  What I want to achieve is using FFMPEG to stream many video files of different codecs and resolutions to my RTMP server one after the other. These files can be for example avi, mp4, mkv. All with seamless playback.

  



  So far I've managed to optimise the playback of a single video using the following command :

  



  ffmpeg -re -i video.mp4 -r 30 -preset medium -force_key_frames 'expr:gte(t,n_forced*4)' -g 120 -keyint_min 120 -acodec aac -vcodec libx264 -b:v 1M -b:a 192k -f flv rtmp://address/live/live


  



  Succeeding with that I then proceeded to attempt to use concat to read a list of files from a .txt file and play them one after the other, which looks like this :

  



  file '/pathtovideo/video1.mp4'
file '/pathtovideo/video2.avi'
file '/pathtovideo/video3.mkv'


  



  What I've ended up with below works well for the first file played, but there's a nice bit of pausing and freezing during playback before I start to see the next video, which has out of sync audio and video :

  



  ffmpeg -re -safe 0 -f h264 -f concat -segment_time_metadata 1 -i "videos.txt" -vf select=concatdec_select -af aselect=concatdec_select,aresample=async=1 -r 30 -preset medium -tune animation -force_key_frames 'expr:gte(t,n_forced*4)' -g 120 -keyint_min 120 -acodec aac -vcodec libx264 -b:v 1M -b:a 192k -f flv rtmp://address/live/live


  



  When the new video file starts, I notice the output of FFMPEG stops increasing the frames processed for about 5 seconds.

  



  Essentially the outcome is a poor transition between videos and lots of playback freezing on any proceeding video after the first.

  



  I'm a bit lost as to what to do to improve this, so any help is appreciated.