I was waiting for someone else to do the answering...

On Wed, 9 Aug 2006, David Highley wrote:

> I'm stuck trying to get 5 mythtv recordings out of 50 transcoded and
> recorded onto DVD discs. Process is as follows:

> The first step transcodes a nupple video stream file to an mpeg2 file
> cutting out the commercials. It works for most of the recordings but

        And therein is the problem area.  However that re-coding/transcoding
        is being done (I didn't' see anything that looked like decode/encode 
        commands) the output is in error about 10% of the time.   Basically
        that indicates that the proceedure is on the verge of being broken
        and that it doesn't take much to generated out of (DVD) spec streams.

> when mplex does an early termination with the warning data will arrive
> too late in reference to the video stream I have not been able to figure

        What I am almost certain that mplex is saying is that the 
        bitrate is too high for a DVD.

>    INFO: [mplex] SYSTEMS/PROGRAM stream:
>    INFO: [mplex] rough-guess multiplexed stream data rate    : 0402496
>    INFO: [mplex] target data-rate specified               : 10080000
>    INFO: [mplex] Setting specified specified data rate: 10080000

        The first number 0402496 is a result of a bug in 1.8.0 - that's 
        obviously a bogus value.

        However, the 'target bitrate' seems to indicate you're right up
        against the absolute limit for a DVD (10.08 Mb/s).   No headroom
        for the bitrate at all.  

>    INFO: [mplex] Audio c0: buf=      0 frame=000000 sector=00000000
>    INFO: [mplex] Video e0: buf=      0 frame=000000 sector=00000000
> ++ WARN: [mplex] Stream e0: data will arrive too late sent(SCR)=107727725 
> required(DTS)=107727626

        Don't specify such a high bitrate.  I didn't see anything that looked
        like an encoding command in the script that was given so I can't 
        comment on the options being used except to say "lower the bitrate"
        (you won't see the difference).

        Steven Schultz


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