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• avcodec/v4l2_context : return EAGAIN to signal full buffers

  16 août 2020, par Andriy Gelman

  avcodec/v4l2_context : return EAGAIN to signal full buffers
  Return proper error when frame buffers are full. This path is triggered
  
  on the DragonBoard 410c since the encoding API change in commit
  
  827d6fe73d2f5472c1c2.
  Signed-off-by : Andriy Gelman <andriy.gelman@gmail.com>
  
  Reviewed-by : Mark Thompson <sw@jkqxz.net>
  

  • [DH] libavcodec/v4l2_context.c

• Run ffmpeg on windows - real-time buffer [USB Camera] [video input] too full or near too full frame dropped

  14 juillet 2020, par Nikola Lukic

  I got successed on macos and linux with :

  


  Linux :

  


  ffmpeg \
    -f v4l2 \
    -framerate 25 -video_size 640x480 -i /dev/video0 \
    -f mpegts \
    -codec:v mpeg1video -s 640x480 -b:v 1000k -bf 0 \
    http://localhost:8081/supersecret


  


  MacOS test :

  


    ffmpeg -f avfoundation -framerate 30 -video_size 640x480 \
  -i "0" -f mpegts -codec:v mpeg2video -s 640x480 -b:v 1000k \
  -bf 0 http://localhost:8081/supersecret


  


  I already installed ffmpeg on windows a just need correct command.

  


  My error log is :

  


  


  /dev/video0: No such file or directory

  


  


  Update :

  


  After ffmpeg -list_devices true -f dshow -i dummy i got :

  


  ...
[dshow @ 000001985949ce80] DirectShow video devices (some may be both video and audio devices)
[dshow @ 000001985949ce80]  "USB Camera"
[dshow @ 000001985949ce80]     Alternative name "@device_pnp_\\?\usb#vid_0c45&pid_6340&mi_00#6&313cdc8e&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"
...


  


  Than i try to run my server with :

  


  ffmpeg -f dshow -i video="USB Camera"  -framerate 30 -video_size 640x480 -f mpegts -codec:v mpeg2video -s 640x480 -b:v 1000k -bf 0 http://localhost:8081/supersecret


  


  And i catch this log :

  


  Input #0, dshow, from 'video=USB Camera':
  Duration: N/A, start: 27271.559000, bitrate: N/A
    Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 30 fps, 30 tbr, 10000k tbn, 10000k tbc
[dshow @ 0000022a4be9f0c0] real-time buffer [USB Camera] [video input] too full or near too full (101% of size: 3041280 [rtbufsize parameter])! frame dropped!
    Last message repeated 173 times
[tcp @ 0000022a4beae340] Connection to tcp://localhost:8081 failed: Error number -138 occurred
http://localhost:8081/supersecret: Unknown error
[dshow @ 0000022a4be9f0c0] real-time buffer [USB Camera] [video input] too full or near too full (101% of size: 3041280 [rtbufsize parameter])! frame dropped!


  


• (FFMPEG Error)Real-time buffer [USB cam's name] too full or near too full

  9 juin 2020, par ZzangWoo

  I am doing project about making rtsp stream of my USB Camera.
And my project environment is 
- OS : windows server 2019
- CPU : AMD Ryzen 7 3700X
- RAM : 64GB
- GPU : NVIDIA GeForce RTX 2070 SUPER

  



  My project goal is to detect object with YOLO and show original cam video, detected video to client. So I need to change my USB Camera to RTSP Stream. But I had an error below picture.
enter image description here

  



  And this is my command line.

  



  ffmpeg -re -f dshow -i video="JOYTRON HD20" -pix_fmt yuv420p -vsync 1 -threads 0 -vcodec libx264 -r 30 -g 60 -sc_threshold 0 -b:v 640k -bufsize 768k -maxrate 800k -preset veryfast -profile:v baseline -tune film -acodec aac -b:a 128k -ac 2 -ar 48000 -f rtsp rtsp ://localhost:8888/test

  



  I saw an answer that the problem is bandwidth. So I added parameter. It didnt help.

  



  I also added the -rtbufsize parameter and -thread_queue_size parameter. But it didnt help anything.

  



  What should I do ??