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• How to view the stream generated from mkvserver via ffplay ?

  18 juin 2019, par Chaitanya Bhardwaj

  I want to live stream from one source(ffmpeg) to multiple clients for which I’m using mkvserver.
  I’m able to live stream a webcam from ffmpeg(client) to mkvserver(server) as follows :

  On Server :

  nc -l  | ./server

  On Client :

  ffmpeg -f avfoundation -framerate 30 -i 0 -b 900k -f matroska -r 20 tcp://:

  To view the genereted steam on server, I used the ffplay as :

  ffplay tcp://:<port>
  
  </port>

  but I got the Connection timed out error. Please suggest a way to view the generated stream on the server via ffplay. Thanks !

• The FFmpeg-generated video mute after seeking it forward [closed]

  16 septembre 2022, par PersianMan

  The video mutes after seeking it forward. It was created with FFmpeg. When I play it normally (without seeking it), the audio played. I am a Linux user and test it with VLC media player and mpv.

  


  I generated it with this :

  


  ffmpeg  -i video.flv -i audio1.flv -i audio2.flv -i audio3.flv -i audio4.flv -i audio5.flv  -i audio6.flv  -i audio7.flv  -i audio8.flv  \
-filter_complex "\
[0:v]tpad=start_duration=29.429[v];\
[1:a]adelay=3654.0[a1];\
[2:a]adelay=53563.0[a2];\
[3:a]adelay=1148851.0[a3];\
[4:a]adelay=1313774.0[a4];\
[5:a]adelay=1373197.0[a5];\
[6:a]adelay=2061735.0[a6];\
[7:a]adelay=2736617.0[a7];\
[8:a]adelay=3387278.0[a8];\
[a1][a2][a3][a4][a5][a6][a7][a8]amix=inputs=8[a]"\
 -map "[v]"  -map "[a]"  -c:v libx264 -crf 23 -c:a mp3 -s 500x500 -shortest ./output.flv


  


  [1:a] and [5:a] is a main audio (other audio have small duration). If I seek after 1373197.0 ms, the video has been muted (when [5:a] must be played).

  


• gstreamer vaapih264enc generated ts segment dont play on AVPlayer

  21 juin 2022, par Guru Govindan

  I have a pipeline that transcodes an rtsp stream into hls segments. The manifest is playable in browsers(with hlsjs) and ffplay and VLC. However when I play the stream or individual ts segments in Quicktime player or my IOS App that uses avplayer, it doesnt work.

  


  This seems to be an issue only with vaapih264enc. When I try the same with software encode like x264enc it works fine.

  


  The following is a simple pipeline where this is reproducible.

  


  GST_DEBUG=3 gst-launch-1.0 rtspsrc location='rtsp://user:pass@10.10.10.12:554/' name=rtpsrc0 \
 rtpsrc0. ! rtph264depay ! queue ! decodebin ! vaapih264enc ! mpegtsmux name=mux ! filesink location=mymux.ts \
 rtpsrc0. ! decodebin ! queue ! fdkaacenc ! mux.


  


  when I run the following command to copy the encoded stream as is from the generated ts segment it works

  


  ffmpeg -i mymux.ts -c copy mymux_ffmpeg.ts


  


  Is the ffmpeg adding some additional header information that the quicktime player is happy with ?

  


  I appreciate any help with this.