On 2021-04-05 21:02, Adrian Cable wrote:
Hi,
I have a question that I thought should have an ‘easy’ answer – I have spent a
lot of time searching and I cannot find it, so thought I would ask here.
My application sounds simple. I have an input RTSP stream, which I need to
transcode and output as an RTP stream. Command line is very simple, something
like:
./ffmpeg -i rtsp://… -vf scale=1024:-1 -c:v libx264 -f rtp rtp://…
Now, ffmpeg is running on a CPU-constrained platform, and it may be that, in
order for the transcoding to ‘keep up’ with the input, the output framerate
needs to be less than the input framerate, which is totally fine. The
problem/question is: how do I get ffmpeg to drop frames as required to keep the
pipeline running real time?
I can’t simply ‘guess’ a sustainable output framerate and set using -r XXX or
-vf fps=fps=XXX, because the properties of the input can change at any time, so
any XXX won’t be constant.
XXX *will* be constant and independent of the input frame rate.
"Convert the video to specified constant frame rate by duplicating or dropping
frames as necessary."
I hope this helps,
Mark.
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