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• Read dumepd RTP stream in libav

  25 mai 2017, par Pawel K

  Hi I am in a need of a bit of a help/guidance because I got stuck in my research.

  The problem :

  How to convert RTP data using either gstreamer or avlib (ffmpeg) in either API (by programming) or console versions.

  Data

  I have RTP dump that comes from RTP/RTCP over TCP so I can get the precise start and stop for each RTP packet in file. It’s a H264 video stream dump.
  The data is in this fashion because I need to acquire the RTCP/RTP interleaved stream via libcurl (which I’m currently doing)

  Status

  I’ve tried to use ffmpeg to consume pure RTP packets but is seems that using rtp either by console or by programming involves "starting" the whole rtsp/rtp session business in ffmpeg. I’ve stopped there and for the time being I didn’t pursue this avenue deeper. I guess this is possible with lover level RTP API like ff_rtp_parse_packet() I’m too new with this lib to do it straight out.

  Then there is the gstreamer It has somewhat more capabilities to do it without programming, but for the time being I’m not able to figure out how to pass it the RTP dump I have.

  I have also tried to do a little bit of a trickery and stream the dump via socat/nc to the udp port and listen on it via ffplay with sdp file as an input, there seems to be some progress the rtp at least gets recognized, but for socat there are loads of packet missing (data sent too fast perhaps ?) and in the end the data is not visualized. When I used nc the video was badly misshapen but at least there were not that much receive errors.

  One way or another the data is not properly visualized.

  I know I can depacketize the data "by hand" but the idea is to do it via some kind of library because in the end there would also be second stream with audio that would have to be muxed together with the video.

  I would appreciate any help on how to tackle this problem.
  Thanks.

• Converting videos to flv using FFMPEG and losing the duration

  22 avril 2012, par Aline Bossi

  I use FFMPEG to convert some videos for the extension FLV, thereafter through an application is sent this video to a web page, where it is displayed through the JW Player. My problem happens on the website because the player does not display the total time of the video, thus I can not move forward or back my video. For conversion use the following code :

  -i "{ArquivoOrigem}" -vcodec flv -f flv -r 29.97 -s 320x240 -aspect 16:9 -b 200k -ac 1 -ar 22050 -ab 56k d "{ArquivoDestino}"

  So, is there any way I can do that ?
  tks

• Audiopulse record multiple xfbv screens with python

  7 octobre 2020, par Eric Lagarda

  I’m trying to do something complicated and I need some help.

  


  I’m able to record a session (video and audio) with python using xvfb and ffmpeg.

  


  I just want to visit a page using selenium and record the video and audio. It’s working but when I try to run multiple instances, the audio is mixing between records.

  


  How can achieve that ? I’m using pulseaudio. I know that with also you can set like a interface per instance, but I don’t know how to do it.

  


  Thanks for you support and comments.