[FFmpeg-devel] Change bitrate on-the-fly PoC (Patch)

Llorx dallorx at gmail.com
Mon Aug 8 23:38:34 EEST 2016

New update with a small fix for Linux (Error compiling)

Jorge Fuentes

2016-08-07 1:04 GMT+02:00 Llorx <dallorx at gmail.com>:

> Hi Ronald,
> Well, this is a PoC. There are a lot of ways to implement this under a
> security context, so that's not a problem. For example, using ZeroMQ as
> Bodecs Bela says in the other thread, feature already implemented in ffmpeg
> as you can see here: https://www.ffmpeg.org/ffmpeg-all.html#zmq_002c-azmq
> As I said, this is just an undocumented-bad-written PoC, to get the point
> and argue about the feature, not argue about the bad implemented code. How
> to implement the feature is something we can discuss about later.
> Also, I doubt that every user build needs 99% of the filters, but they are
> there, just in case someone needs it. Why this quantity of filters,
> formats, codecs, etc? Because ffmpeg is a video processor software, it
> needs the maximum number of features, just in case.
> This feature is something some people already asked for (I found some of
> them when I googled about this some time ago) and I implemented it about 2
> years ago because I needed it too. Now I just want to release the code to
> the community as I had people contacting me to get a copy. The people that
> do not need it just don't enable it, as I don't enable channelsplit in my
> streams, for example.
> I think that this feature belongs to ffmpeg as a good % of users use
> ffmpeg as a live streaming software, including major videomixing software
> companies, using it as their main live video publisher software (See vMix).
> We have to understand that currently ffmpeg is not only a video converting
> software, but a live stream solution for most users, so it needs to have
> live streaming features, like other propietary video streaming software has
> (See Adobe Media Encoder. Altough I don't like how they implemented it).
> I use this feature a lot since I created it about 2 years ago, and now I
> just want to share it, as I know that some people will benefit from this
> because there is not any solution (and best of all, opensource solution)
> for these situations.
> Thank you for your point of view. I hope I made myself clear.
> Jorge Fuentes
> 2016-08-07 0:02 GMT+02:00 Ronald S. Bultje <rsbultje at gmail.com>:
>> Hi,
>> On Sat, Aug 6, 2016 at 9:00 AM, Llorx <dallorx at gmail.com> wrote:
>> > Hi,
>> >
>> > Some days ago I started a thread here:
>> > http://ffmpeg.org/pipermail/ffmpeg-devel/2016-August/197306.html
>> >
>> > Starting a new thread now because I lost my main thread mail and don't
>> know
>> > how to "reply" without having it in my inbox :-(
>> >
>> > ffmpeg has almost on-the-fly bitrate change control already built-in,
>> > checking rc_buffer_size and rc_max_rate changes, so I only needed to
>> change
>> > those values while ffmpeg was running.
>> >
>> > I attach my Proof of Concept.
>> >
>> > PoC limitations:
>> >  - Not configurable via command line.
>> >  - The build will start listening on localhost ( UDP port
>> 32000
>> > always.
>> This is a pretty significant feature from a security PoV. I'm honestly not
>> even sure it belongs in upstream ffmpeg... Don't get me wrong, I
>> understand
>> what you're doing and why you're doing it this way and maybe this is the
>> best (or at least quickest) way to do it. I might have done it the same
>> way
>> if I was trying to do what you're doing, I'm not sure.
>> But, having said that, I doubt that every user's build of ffmpeg
>> necessarily needs this feature.
>> Ronald
>> _______________________________________________
>> ffmpeg-devel mailing list
>> ffmpeg-devel at ffmpeg.org
>> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
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