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• How to use ffmpeg for live streaming fragmented mp4 ?

  2 mai 2018, par Cross_

  Following a variety of stackoverflow suggestions I am able to create a fragmented MP4 file, then slice it into the header part (FTYP & MOOV) and various segment files (each containing MOOF & MDAT). Using Media Source Extensions I download and add the individual segments - that’s all working great.

  Now I would like to create a live streaming webcam with that same approach. I had hoped that I could just send the MOOV box to each new client plus the currently streaming segment. This however is rejected as invalid data in the browser. I have to start with the first segment and they have to be appended in order. That’s not helpful for a live streaming scenario where you don’t want to see the whole stream from the start. Is there any way to alter the files so that the segments are truly independent and you can start playback from the middle ?

  For reference, this is how I am setting up the stream on the OS X server :

  $ ffmpeg -y -hide_banner -f avfoundation -r 30 -s 1280x720
  -pixel_format yuyv422 -i default -an -c:v libx264 -profile:v main -level 3.2 -preset medium -tune zerolatency -flags +cgop+low_delay -movflags empty_moov+omit_tfhd_offset+frag_keyframe+default_base_moof+isml
  -pix_fmt yuv420p | split_into_segments.py

  Playback is done with a slightly modified version of this sample code :
  https://github.com/bitmovin/mse-demo/blob/master/index.html

• FFmpeg drawtext filter - is it possible to use variables with live data for x,y coordinates ?

  3 mai 2019, par DavidK

  I’d like to use variables for FFmpeg’s drawtext filter’s x,y coordinates so I can feed them with real-time data. The below solution with sendcmd works but I have to add relative timecodes at the beginnings so FFmpeg can link coordinates to time positions. Can it be done without timecodes with only the actual coordinates and tell FFmpeg that it should update these coordinates every 100ms ?

  It would look like this in my case :

  cmd.txt

  drawtext reinit ’x=960:y=540’ ; (coordinates change when there’s a new position from the live source and FFmpeg updates these via sendcmd regularly).

  Thanks !

• Bad behavior live streaming from opencv to ffserver (ffmpeg)

  9 octobre 2015, par jlarghi

  I’m trying to do live streaming of the traffic videos.

  I have this fragment of C++ code :

  Mat frame, output;
  
  Size sizeOutput(640,360);
  
  cvtColor(frame, output, CV_RGB2GRAY);
  
  resize(output, output, sizeOutput);
  
  cout << output.data;

  In the other hand I run :

  ./opencvvehicletrack | ffmpeg -f rawvideo -pix_fmt gray -s 640x360 -i - -an  http://localhost:8090/feed1.ffm:

  Where opencvvehicletrack print on the stdout.

  And I got the next result : https://youtu.be/HqpAv_oi3u4

  I can’t fix the "continous displacement to the right"

  Can anyone help me ? Thanks a lot.