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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 ?

  


• ffmpeg rtmp broadcast on youtube speed below 1x

  23 septembre 2020, par usr6969

  i made an python and opencv program that produce frame per second around 8-15fps with MJPEG output format where MJPEG address served on localhost webserver (0.0.0.0:5000) and, i do attempt to broadcast its frame to rtmp server like youtube using ffmpeg so basically i do convert MJEG to flv and forward to rtmp server with following command ffmpeg -f  mjpeg -i http://0.0.0.0:5000/video_feed -f lavfi -i anullsrc -c:v libx264 -vf "scale=trunc(oh*a/2)*2:320,unsharp=lx=3:ly=3:la=1.0" -crf 24 -c:a aac -ac 1 -f flv rtmp://a.rtmp.youtube.com/live2/xxx-xxx-xxx but unfortunatelly youtube stream has too many buffering that occur every around 5 second and ffmpeg terminal tell that writing speed is only around 0.317x (expected to be sync with youtube around 0.99-1x), my question is

  


  does there a way to stream 'realtime' around 8-15fps and automatically sync with youtube rtmp server without buffering because i thought that youtube require around 30fps while my fps only 9-15fps that probably causing buffer.
do there an such like additional ffmpeg's parameter that able to speed up writing ? thank you

  


  

  


  

  


• FFMPEG - Delete unused files or streaming without saving files

  8 septembre 2020, par M.Demiral

  I need to get live video from a device. I have to play the video on the browser. live video can be received as RTP or UDP.

  


  Since there is no support for VLC, I published the video by getting it via RTP with FFMPEG and creating a web server with Nginx. But later I realized that it is recording video tracks to disk. This is a situation I don't want.

  


  I can show it in web browser using HLS.js. It is saving to HDD when I use the following command.

  


  ffmpeg -i udp://127.0.0.1:5000 -vcodec libx264 -vprofile baseline -acodec aac -strict -2 -max_muxing_queue_size 1024 -f flv rtmp://127.0.0.1/show/stream


  


  I don't want it to save to HDD.

  


  When the codec I understand is changed, it saves the video to HDD.
I think I prevented it from recording like this. But I don't know how to play from the web browser.

  


  ffmpeg -i udp://127.0.0.1:5000 -strict -2 -max_muxing_queue_size 1024 -f flv rtmp://127.0.0.1/show/stream


  


  Is there any way to delete unused files or stream without saving to disk ?

  


  P.S.

  


  First question as it may be needed : How to play a live video in the browser ?