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• ffmpeg live stream recording stops on stream interrupt

  3 septembre 2018, par Anton Antonov

  I have to record live stream with ffmmpeg. It is easy. Here is my command line :

  ffmpeg -i /source/address> -s 320x240 -r 25 -c:v libx264 -g 125 -vb 300000 -maxrate 400000 -bufsize 600000 -profile:v baseline -deinterlace -preset veryfast -ac 2 -ar 48000 -c:a libfdk_aac -b:a 64000 -f mp4 to/dst/file>

  But my task is to make ffmpeg to stop and exit when live stream is stopped.

  Is there easy way to do this ?

• Is stream-format in h264 related to camera provided stream or is it more like transport thing ?

  13 janvier 2023, par rafauu

  I've got camera that produces video stream in different formats. One of them is h264 encoded stream. I use dshow along with gstreamer to acquire this stream and process it with c++ and send it also via shared memory. My question is related specifically to field stream-format in gst caps. How do I know whether it is byte-stream or avc ? Is it tightly coupled to stream produced by camera or is it like transport thing that I set with gstreamer by my own ? I work with rather complicated commercial specific pipelines that I cannot share full here. When I set in my code gst_caps_set_simple (gstCaps, "stream-format", G_TYPE_STRING, "byte-stream", nullptr); it works but I am not 100% why so I want to clarify that.

  


  I've tried checking information about this specific camera with ffmpeg but I cannot get info about stream-format. Best I got is :
ffmpeg -f dshow -list_options true -i video="nameOfCamera"

  


  (...)
vcodec=h264  min s=128x96 fps=0.015625 max s=768x480 fps=29.97
vcodec=h264  min s=128x96 fps=0.015625 max s=768x576 fps=25
vcodec=h264  min s=128x96 fps=0.015625 max s=768x480 fps=29.97
vcodec=h264  min s=128x96 fps=0.015625 max s=768x576 fps=25
vcodec=h264  min s=128x96 fps=0.015625 max s=768x480 fps=29.97
vcodec=h264  min s=128x96 fps=0.015625 max s=768x576 fps=25
vcodec=h264  min s=128x96 fps=0.015625 max s=768x576 fps=25
(...)


  


• ffplay lose video stream from rtmp server sent by ffmpeg, only play audio stream

  1er mai 2020, par Константин Тюрин

  I run a stream like this

  



  C :\ffmpeg -rtbufsize 1000000K -re -f dshow -i video="HD Pro Webcam C920" -f dshow -i audio="Микрофон (HD Pro Webcam C920)" -s 320x240 -c:v libx264 -c:a aac -ar 44100 -ac 2 -f flv 
"rtmp ://37.143.12.233:1935/live1/stream"

  



  and play the stream like this

  



  C :\ffplay rtmp ://37.143.12.233:1935/live1/stream

  



  if I start the player first and then stream, then everything is fine, but if the stream first and then the player, then I can only hear the sound, sometimes first running is ok though, but rarely
If I send only video, everything is fine. I tryed to change audio codec settings, ffmpeg and ffplay version but it did not help. Then I tryed other players like VLC media player, and some web player https://hls-js.netlify.app/demo/ . With web player it was better, I did not lose the video, but in 9/10 cases I get eternal loading and need to click apply constantly. What I need to do so as not to lose the video stream in ffplay player and maybe problem in streaming command ? I appretiate any help.