[mythtv-users] transcode OTA HD MPEG2 -> MPEG4 w/AC3 passthru

[casey dunn]

I'm one of thouse looking for more user configurability in the transcode
setup...  And I know I saw a developer post on this list that they had done
a lot of work twoards that goal but haven't been able to find it.

On 3/20/06, Paul B. Henson <henson at acm.org> wrote:
>
>
> Disk space on my air2pc based HD Myth box is getting tight, so I've been
> looking into transcoding to decrease the size of some of the recordings.
>
> I've successfully transcoded some of my high-definition recordings to
> lower
> resolution MPEG4 with considerable size savings, from 4 GB to about 800MB.
> Visual quality is excellent, while not as good as the original, very
> watchable particularly for less important shows.
>
> However, there is a very noticeable difference in quality between the
> original AC3 dolby digital 5.1 soundtrack and the transcoded MP3 version.
>
> What I would really like to do is transcode the video to MPEG4 but leave
> the audio alone, ending up with an MPEG4/AC3 media stream. However, there
> doesn't appear to be any option in the built in transcoding implementation
> to allow for this.
>
> Reviewing the mailing list archives, I saw a couple of mentions of people
> wanting similar functionality, but no resolutions.
>
> I think it would be possible to achieve this with a user job that
> transcodes using third-party utilities, but I haven't been able to find a
> good source of information on setting up user jobs.
>
> Would there be any interest in an enhancement request to allow the
> internal
> transcoding to support audio passthru?
>
> Also, could anyone possibly provide a pointer to a good source of
> documentation for user jobs, in particular relevant to transcoding?
>
> Thanks much...
>
>
> --
> Paul B. Henson  |  (909) 979-6361  |  http://www.csupomona.edu/~henson/
> Operating Systems and Network Analyst  |  henson at csupomona.edu
> California State Polytechnic University  |  Pomona CA 91768
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