[Libav-user] Switching codecs from encode to playback on the fly

Alex Cohn alexcohn at netvision.net.il
Sun May 6 21:36:16 CEST 2012

On May 6, 2012 10:28 PM, "Bruce Wheaton" <bruce at spearmorgan.com> wrote:
> On May 6, 2012, at 11:04 AM, Alex Cohn wrote:>
>> > Then I suppose the question becomes, can I use the same
AVFormatContext with encoders and decoders… and use the same AVStreams?
>> >
>> > Bruce
>> They were never designed for such reuse; but even if you could, what
kind of profit would you gain? These objects are negligebly small compared
to video data you must cache anyway.
> Good question. The intent is to seamlessly move from ingesting a movie
and viewing it to playing back. I can't find a way to access the same movie
for playback as it's being ingested (that would work fine too), can't tell
which media container might support that even. So my workaround was to get
frames, cache them for playback and record at the same time.
> I was hoping to use all the same structures to minimize the interruption
as I switch between modes. It was more the time to set up the new
structures - opening the movie file etc. that was a pain, and having to
have a double set of structures that will bloat my playback code.
> Bruce

Can you describe your intended usage in some kind of very high level

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