[vlc-devel] commit: Decreased priority of libmpeg2 decoder below avcodec. ( Laurent Aimar )

[Måns Rullgård]

"Rémi Denis-Courmont" <remi at remlab.net> writes:

> Le samedi 30 janvier 2010 21:26:42 Måns Rullgård, vous avez écrit :
>> "Rémi Denis-Courmont" <remi at remlab.net> writes:
>> > Le dimanche 24 janvier 2010 16:28:59 git version control, vous avez écrit 
> :
>> >> vlc | branch: master | Laurent Aimar <fenrir at videolan.org> | Sun Jan 24
>> >>  15:26:09 2010 +0100| [7ad6676d1b65a222682dc814782b57de798c068c] |
>> >>  committer: Laurent Aimar
>> >>
>> >> Decreased priority of libmpeg2 decoder below avcodec.
>> >
>> > On second thought, that really does not make sense.
>> >
>> > libmpeg2 provides a strict subset of the functionality of
>> > libavcodec, in terms of what its pf_activate function
>> > accepts. Reducing its priority essentially turns it into dead
>> > code. configure --disable-libmpeg2 would have the same in a much
>> > more efficient manner.
>> 
>> Did you ever figure out why vlc+libavcodec was slower on the N900?
>
> I haven't really tried. And while you can install oprofile, I am not at all 
> familiar with the tool.
>
> Laurent hypothesized that it could be the packetizer VLC puts in
> front of lavc but not libmpeg2.

There's only one way to find out: run the profiler...

Does vlc have a decode-only mode?  Profiling is easier if the display
overhead is removed, and I don't have X running on my ARM boards.

-- 
Måns Rullgård
mans at mansr.com