[mythtv-users] Video too slow on some mpeg2's (actually layer 1 audio problem)
Roger Heflin
rogerheflin at gmail.com
Sun Feb 24 02:05:36 UTC 2008
Ken Mandelberg wrote:
> I posted recently about a problem with using the internal player with
> mpeg2's imported from an HD Tivo. They played properly with
> mplayer/xine/vlc, but not the internal player. I described it as slow
> video since the internal player was dropping frames and getting behind
> the audio.
>
> I thought the problem was the resolution which was a little different
> than the HD streams captured directly on myth.
>
> As it turns out, thats not it. It the audio. The Tivo mpeg2's have
>
> Audio : Mpeg 1 layer 1
> free bitrate 44100 Hz
>
> while the internally captured streams are
>
> Audio : Mpeg 1 layer 3
> 192 kbps 32000 Hz
>
> I can get around the problem by transcoding which will convert it to
> layer 3, but thats expensive and I would rather process the video as
> little as possible.
If you just copy through the video it is not that bad
("-ovc copy" in mencoder).
Converting ac3 to mp3 takes me about 6-7 minutes of real time for a 60
minute show, so long as I only copy through the video as it, this
is with either a 3.2 Ghz P4, or a 2Ghz AMD CPU.
Roger
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