Mark – yes – you’re understanding exactly right! I was thinking specifically of 
the encoder ‘throttle’ being a frame rate control, but other forms of quality 
control that could be self-adjusted by the encoder to keep up with the input 
would also work for me.

I did look through the history here but couldn’t find anything quite 
applicable. I do appreciate you taking the time to understand my issue! 
Hopefully someone who has direct experience of how to achieve this will read 
this as a result and be able to help.

-Adrian


From: ffmpeg-user <ffmpeg-user-boun...@ffmpeg.org> on behalf of Mark Filipak 
(ffmpeg) <markfili...@bog.us>
Date: Wednesday, April 7, 2021 at 7:19 PM
To: ffmpeg-user@ffmpeg.org <ffmpeg-user@ffmpeg.org>
Subject: Re: [FFmpeg-user] How to dynamically drop frames as required to keep 
transcoding real time?
On 2021-04-07 21:51, Adrian Cable wrote:
> Mark,
>
>> Sorry, I thought XXX referred to the output -- -vf fps=fps=XXX is *output* 
>> frame rate. To the best
>> of my knowledge, the input frame rate of VFR video can't be specified.
>
> I’m referring to XXX as the maximum *output* frame rate that the pipeline can 
> support at a given time, while keeping up with the input.

I think what you want is an encoder with a quality throttle that can be used to 
dial down the
quality (and hence, reduce encoding time) when it can't keep up with the input 
at the current
compression factor. I'm pretty sure that such an encoder control exists because 
what you want to do
is not at all uncommon. That is, if I understand what you want to do.

I don't know how to do it because I don't stream, but I've seen the issue 
addressed here previously.
Perhaps someone more knowledgeable will read this and help.
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