[vlc-devel] transcoding is slow

[Kaarlo Räihä]

2011/5/4 zhu shi song <zhushisongzhu at yahoo.com>

>    I think the main cause that can impact the transcoding speed is the
> speed of x.264 encoding.   I know that x264 have three sets of preset
> parameters: High Speed preset, Normal preset, High Quality preset.  How can
> I set these parameters through VLC transcode options?
>

E.g. vlc 111.avi :sout=#transcode{vcodec=h264,
venc=x264{preset=ultrafast}}:file{mux=mp4,dst=out.mp4}


>    And how can I utilize hardware such as CUDA acceleration function to
> speed the transcoding?
>

You cannot. x264 doesn't have CUDA support (or at least official releases
don't have). And AFAIK DivX 3 Low video cannot be hardware decoded.


>    thanks
>      zhu
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