[mythtv] A/V diverged by +/-30 frames, extending frame to keep
audio in sync
Lincoln Dale
ltd at interlink.com.au
Tue Aug 30 00:25:33 UTC 2005
Mark,
i have a bunch of recordings which seemingly hit something like this.
the trigger point seems is somewhat random - but for the most part it
has been about 90+ minutes into a 2 hour recording after which a/v sync
gets way out of whack (and continues to get more out of sync the longer
it goes on).
i thought it was something to do with mplayer .nuv patches (i use an
xbox as a frontend where i have seen this) ..
i assume it has nothing to do with the length/time of the individual
show that is being recorded, but rather that a "pts wrap" will occur
sometime in a given mpeg2 stream (every 13 or 26 hours if i understand
mpeg2 pts values correctly).
i presume we can add a fix into the demux code also to deal with this
for previously transcoded streams also? i.e. handle the wrap better?
cheers,
lincoln.
Mark Spieth wrote:
> This is almost certainly a pts wrap effect.
> This assumes you have a mpeg2 recording which hasnt been transcoded.
> When it gets in this mode,
> use menu, select audiosync, press 0 or 1 (forget which) to do a fake resync.
>
> or apply this patch and see. If you have transcoded the patch wont do
> anything for you for the recording you have but will prevent this from
> happening in the future..
>
> cheers
> mark
>
>
>
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