[Libav-user] Reducing the Frame-Rate of a Network Video Stream

Alex Cohn alexcohn at netvision.net.il
Tue Jul 30 12:34:18 CEST 2013

On Tue, Jul 30, 2013 at 12:35 PM, Adi Shavit <adishavit at gmail.com> wrote:
> Hi Mike,
> On Tue, Jul 30, 2013 at 11:13 AM, mikeversteeg <mike at mikeversteeg.com> wrote:
>> Check the PTS of each frame and use that to decide whether to throw it out or
>> not.
> Ah, thanks.
> These will give me the play-timestamps, right?
>> That way there is no need to decode frames you won't be using.
> Do you mean, no need to PROCESS, not decode.
> Don't I have to decode all frames?
> If I could not-decode (via the decoder) some of the frames that would
> be great and further save cpu. Can I do that, just skip some encoded
> frames? Wouldn't that mess up the following frames?
> Thanks,
> Adi

You must decode all frames, or skip to the next IDR frame, if you want
to avoid artiifacts. Yes PTS is play timestamp. The units may depend
on your stream format, and are generally expressed in terms of the

Alex Cohn

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