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• Retrieve real-time entries of m3u8 file (HLS) creating with ffmpeg

  5 janvier 2018, par Amit Yadav

  I am using ffmpeg for the recording of rtsp stream from IP camera by generating m3u8 file with ts chunks. I want real time or only latest entries done by ffmpeg in generated m3u8 file but I didn’t able to get that.

  ffmpeg -rtsp_transport tcp -i rtsp://admin:admin@192.168.0.27:80/cam/realmonitor?channel=1&subtype=0 -t 86399 -vcodec copy -force_key_frames expr:gte(t,n_forced*5) -hls_list_size 0 -r 12 -f segment -segment_time 10 -strftime 1 -segment_list_type m3u8 -segment_list /tmp/4/del20180105.m3u8 -segment_format ts -y /tmp/4/%Y%m%d%H%M%S.ts

  When I apply tail command on generated m3u8 file like below I am not able to get new entries.

  tail -f /tmp/4/del20180105.m3u8 

  I thought for every new entry ffmpeg is replacing the whole m3u8 file with new entry. How I can get realtime entries of ts file name and duration from ffmpeg generated m3u8 file ?

• Trying to capture display output for real-time analysis with OpenCV ; I need help with interfacing with the OS for input

  26 juillet 2024, par mirari

  I want to apply operations from the OpenCV computer vision library, in real time, to video captured from my computer display.
The idea in this particular case is to detect interesting features during gameplay in a popular game and provide the user with an enhanced experience ; but I could think of several other scenarios where one would want to have live access to this data as well. 
At any rate, for the development phase it might be acceptable using canned video, but for the final application performance and responsiveness are obviously critical.

  



  I am trying to do this on Ubuntu 10.10 as of now, and would prefer to use a UNIX-like system, but any options are of interest.
My C skills are very limited, so whenever talking to OpenCV through Python is possible, I try to use that instead.
Please note that I am trying to capture NOT from a camera device, but from a live stream of display output ; and I'm at a loss as to how to take the input. As far as I can tell, CaptureFromCAM works only for camera devices, and it seems to me that the requirement for real-time performance in the end result makes storage in file and reading back through CaptureFromFile a bad option.

  



  The most promising route I have found so far seems to be using ffmpeg with the x11grab option to capture from an X11 display ;
(e.g. the command
ffmpeg -f x11grab -sameq -r 25 -s wxga -i :0.0 out.mpg
captures 1366x768 of display 0 to 'out.mpg').
I imagine it should be possible to treat the output stream from ffmpeg as a file to be read by OpenCV (presumably by using the CaptureFromFile function) maybe by using pipes ; but this is all on a much higher level than I have ever dealt with before and I could really use some directions. 
Do you think this approach is feasible ? And more importantly can you think of a better one ? How would you do it ?

  


• avcodec/codec_desc : mark Duck TrueMotion 2.0 Real Time as intra only

  21 août 2018, par Paul B Mahol

  avcodec/codec_desc : mark Duck TrueMotion 2.0 Real Time as intra only
  

  • [DH] libavcodec/codec_desc.c