[Libav-user] Multithread decode and scaler

wolverin wolverin82 at mail.ru
Thu Aug 25 06:16:22 EEST 2022

>The only advice I can give you at this point is to examine how ffmpeg
>itself does and see how your program differs.
But I do not know where to look in ffmpeg, the source text of it is very confusing and there are few examples
>ffmpeg -i some_file_with_mjpeg -f null -
>and at the same time:
>and see how much CPU it uses. If it is >>100%, then multithreading is
>used. If not, then it probably is not possible easily.
Thank you!
I created a file
       ffmpeg -f v4l2 -input_format mjpeg -video_size 1920x1080 -i /dev/video0 -c:v copy test.mjpeg
Then I executed your command and saw the CPU usage of 99-100%
       ffmpeg -i test.mjpeg -f null -
You said "it probably is not possible easily" but not impossible!? so I need to create my own thread queue for decoding or are there other solutions?
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