[vlc] Re: No accelerated IMDCT transform found

[Samuel Hocevar]

On Tue, Nov 26, 2002, Alexis Guerin wrote:

> Why does the video become so slow without acceleration for the IMDCT 
> transform?
> When using the wired network, it is fast enough to see the video, but I am 
> also trying to read the stream through a wireless interface and the quality 
> becomes then unacceptable (only a few frames are appears on the screen).

   I think you're simply dropping packets. Try to run vlc with -vvvvv,
if you get input warnings about discontinuities then it means your
network can't handle THX_Simpsons.vob's bitrate.

> However, when I use the presentation.vob file, vlc use the libmad decoder and 
> the quality of the video is almost perfect despite the narrow band of the 
> wireless transmission.

   AFAIK presentation.vob has a much smaller bitrate than the Dolby and
THX trailers.

> What could be the differences between these files and why can vlc not use the 
> libmad decoder for the THX_Simpsons.vob file when it can do it for the 
> presentation_normal.vob file.

   Because presentation_normal.vob has MPEG audio, hence uses libmad,
and THX_Simpsons.vob has AC3 audio and thus uses liba52.

-- 
Sam.
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