[Ffmpeg-devel] avformat/mpegts reads too much data for lowbitratestreams

Måns Rullgård mru
Thu Jun 9 18:14:16 CEST 2005


Kenneth Aafl?y <kenneth at aafloy.net> writes:

> torsdag 9. juni 2005, 17:27, skrev M?ns Rullg?rd:
>> Kenneth Aafl?y <kenneth at aafloy.net> writes:
>> > torsdag 9. juni 2005, 15:12, skrev M?ns Rullg?rd:
>> >> Kenneth Aafl?y <kenneth at aafloy.net> writes:
>> >> > How do you tell the user that an AVStream is not active anymore?
>> >>
>> >> You stop returning packets from it.  If all the streams go away, you
>> >> do whatever the method is to signal end of file, which I can't recall
>> >> at the moment.
>> >
>> > That's a crude interface, since there is no av_read_frame(AVStream)
>> > you have to depend on time to detect when to change what to decode!
>>
>> Huh?  If you get packets, you decode them.  If there are no packets,
>> you decode nothing.
>
> Say you have a ts with two services, and the user is currently
> decoding the first service. If this service stops it's transmission
> the user (app) either want to exit (since it's the end of the
> 'stream') or switch to the other service (since it's not the end of
> the 'file'). With your interface it's impossible (close to) to
> trigger either change, since there is no notion of 'end of
> substream'.

Consider it a deficiency in libavformat.  Fixing it appears to be
nontrivial.

-- 
M?ns Rullg?rd
mru at inprovide.com





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