[FFmpeg-devel] Change bitrate on-the-fly
ffmpeg at tmm1.net
Mon Aug 1 20:46:15 EEST 2016
I would find your patch useful and am looking forward to reviewing
it. Using a socket isn't a bad way to do it IMHO- it's portable and allows
easy integration from any language.
Another option would be to extend the existing ffmpeg interactive mode to
handle your new command. Currently ffmpeg allows sending commands to
filters, but tbh it's pretty confusing to use and not well documented.
I'd love to see a generic control interface for ffmpeg that was easy to use
programatically, and could handle simple commands like "pause", "resume",
"seek <ss>", etc.
On Sun, Jul 31, 2016 at 9:32 AM, Llorx <dallorx at gmail.com> wrote:
> About 1 or 2 years ago I had written an addition for ffmpeg to change the
> video bitrate while ffmpeg is running. The way I've done it is by listening
> to a UDP socket for an int32, and each time a 4 byte packet enters, changes
> the bitrate, taking effect instantly. Works like a charm, and the UDP way
> fits my needings without problems. I needed it because currently I have a
> business that requires streaming video in some difficult and
> bandwith-changing environments, so I have a thrid party program than
> launchs ffmpeg and analyzes the packets sent to detect bandwidth
> alterations, changing the bitrate accordingly.
> Now I would like to share it with the community, as I had some messages
> from some users telling me to release it (As I posted a question about this
> on Stack Overflow).
> I know that the UDP thing is a bit hackish, so I would like to ask you,
> ffmpeg masters, how do you consider that this can be applied in a more
> "professional" way. I thought that instead of listening to a UDP socket
> (configurable at launch time with a parameter), I can use named pipes,
> memory mapped files or simply process signaling. The last method is only
> available on Unix with SA_SIGINFO. Windows can't handle such signal
> What do you think is the best option?
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> ffmpeg-devel at ffmpeg.org
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