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• Capturing Screen with FFMPEG on RTP protocol

  23 septembre 2020, par mertakkartal

  I am struggling about capturing the screen of remote computer on the same network with ffmpeg on RTP protocol.

  


  On the remote computer I run these two parameter blocks in different bash scripts for making the server catches the stream.

  


  For video :

  


  ffmpeg -f x11grab -framerate 25 -video_size uhd2160 -i :0.0 -c:video h264_nvenc -preset fast -pix_fmt bgr0 -b:v 6M -g 25 -an -f rtp_mpegts rtp://multicastaddress:videoPort

  


  For Audio :

  


  ffmpeg -f alsa -i hw:0,0 -c:audio aac -b:a 48K -f rtp_mpegts rtp://multicastaddress:audioPort

  


  Then , I run my ffmpeg capturing screen parameter block from the server as root privilege like as below :

  


  ffmpeg -y -buffer_size 425984 -thread_queue_size 32 -i rtp://@multicastaddress:videoPort -buffer_size 5000 -thread_queue_size 32 -i rtp://@multicastaddress:audioPort -map 0:0 -map 1:0 -c:v copy -c:a copy output.mp4

  


  When I run it , it outputs those errors as below ,

  


  [rtp @ 0x2329380] RTP: missed 284 packets
[rtp @ 0x2329380] RTP: missed 487 packets
[rtp @ 0x2329380] max delay reached. need to consume packet bitrate=1320.4kbits/s speed=1.27x    
[rtp @ 0x2329380] RTP: missed 2204 packets
[rtp @ 0x2329380] max delay reached. need to consume packet bitrate=1308.9kbits/s speed=1.24x    
[rtp @ 0x2329380] RTP: missed 300 packets
[rtp @ 0x2329380] max delay reached. need to consume packet
[rtp @ 0x2329380] RTP: missed 468 packets
[rtp @ 0x2329380] max delay reached. need to consume packet bitrate=1155.6kbits/s speed= 1.2x    
[rtp @ 0x2329380] RTP: missed 2222 packets
[rtp @ 0x2329380] max delay reached. need to consume packet bitrate=1197.0kbits/s speed=1.19x    
[rtp @ 0x2329380] RTP: missed 278 packets
[rtp @ 0x2329380] max delay reached. need to consume packet bitrate=1156.1kbits/s speed=1.18x    
[rtp @ 0x2329380] RTP: missed 303 packets
[rtp @ 0x2329380] max delay reached. need to consume packet bitrate=1064.8kbits/s speed=1.32x    
[rtp @ 0x2329380] RTP: missed 3 packets
[rtp @ 0x2329380] max delay reached. need to consume packet bitrate=1064.8kbits/s speed=1.17x    
[rtp @ 0x2329380] RTP: missed 280 packets
[rtp @ 0x2329380] max delay reached. need to consume packet bitrate=1095.4kbits/s speed=1.16x    
[rtp @ 0x2329380] RTP: missed 1737 packets
[rtp @ 0x2329380] max delay reached. need to consume packet bitrate=1084.1kbits/s speed=1.15x    
[rtp @ 0x2329380] RTP: missed 485 packets
[rtp @ 0x2329380] max delay reached. need to consume packet bitrate=1142.9kbits/s speed=1.14x    
[rtp @ 0x2329380] RTP: missed 767 packets
[rtp @ 0x2329380] max delay reached. need to consume packet
[rtp @ 0x2329380] RTP: missed 3 packets
[rtp @ 0x2329380] max delay reached. need to consume packet bitrate=1080.6kbits/s speed=1.14x    
[rtp @ 0x2329380] RTP: missed 1562 packets
[rtp @ 0x2329380] max delay reached. need to consume packet bitrate=1063.9kbits/s speed=1.13x    
[rtp @ 0x2329380] RTP: missed 282 packets
[rtp @ 0x2329380] max delay reached. need to consume packet bitrate=1065.8kbits/s speed=1.12x    
[rtp @ 0x2329380] RTP: missed 1 packets
[rtp @ 0x2329380] max delay reached. need to consume packet
[rtp @ 0x2329380] RTP: missed 771 packets
[rtp @ 0x2329380] max delay reached. need to consume packet bitrate=1024.3kbits/s speed=1.11x    
[rtp @ 0x2329380] RTP: missed 1731 packets
[rtp @ 0x2329380] max delay reached. need to consume packet bitrate=1019.1kbits/s speed=1.11x    
[rtp @ 0x2329380] RTP: missed 298 packets

frame=  453 fps=8.9 q=-1.0 Lsize= 7397kB time=00:00:56.60 bitrate=1070.6kbits/s speed=1.11x


  


  After checking the video output with mpv player or ffplay ,I can observe that parameters from server caught the stream but mostly with lost packets so there are distortions in the video output file.

  


  I tried protocol_whitelist "file,rtp,udp" for preventing packet loss but it did not work out unfortunately.

  


  Any other parameter for solving this issue ?

  


• tests/fate/seek : check seek opertation with mov demuxer and file protocol

  9 septembre 2024, par Steven Liu

  tests/fate/seek : check seek opertation with mov demuxer and file protocol
  fix error at fate-seek-* when
  
  configure with —disable-everything —samples=fate-suite/ —enable-demuxer=mov
  Signed-off-by : Steven Liu <lq@chinaffmpeg.org>
  

  • [DH] tests/fate/seek.mak

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