[Libav-user] Encoding with variable frame rate

[Paul B Mahol]

On 5/21/13, Brad O'Hearne <brado at bighillsoftware.com> wrote:
> On May 21, 2013, at 9:34 AM, Kalileo <kalileo at universalx.net> wrote:
>
>>> 1. Does FFmpeg support variable frame rate, or not?
>>
>> ffmpeg gives you the tools to handle it. Don't mix statements about ffmpeg
>> command line tool with what you can do with the ffmpeg libraries.
>
> Does FFmpeg support variable frame rate? If yes, let's take the specific
> example of setting time_base.den to 30 fps. How do I send 15 fps to the
> encoder and ensure accurate playback timing? No theory -- specifics please.
> I'm not arguing, I'm not calling you wrong, I'm not making platitudes about
> or branding ffmpeg. I've got code that for months showed me something
> different and I'm trying to work that out. If you are saying that I should
> be able to send 15fps at an encoder with time_base.den set to 30, and
> correct it by setting pts to 1, 3, 5, 7, etc. i.e. every other frame, then
> I'll construct that case and test it. Is that what you are saying, or
> something different?

Something like that, but also AVPacket.duration of each packet should
be set in AVPacket.time_base units

>
>> You might want to study the basic old example of a player written using
>> the ffmpeg libraries by Dranger. Seriously.
>
> Spent hours with it over months past. That resource, and a few other,
> helped.
>
> Brad
>
>
>
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