[ExtractStream] Re: Audio Synchronisation - Does Anyone have the Answers ?

[Michael Loftis]

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Actually I don't know of any that do that... The only way I'd know how 
to do it is run it through DVD2AVI to get d2v, vfapiconv to get an avi, 
blow that through vdub storing as an uncompressed AVI, then converting 
the "raw" avi to MPEG again *shrugs*. Right now the tools for 
coding/editing, atleast free ones, just aren't quite there yet.

Don Starr wrote:

>I guess my ideal sequence would be:
>
>Extract from TiVo. Split to m2v and m2a. Mux to MPG. (Or even go
>straight from .ty to .mpg).
>Edit MPEG-2, fixing audio offsets and removing commercials, without
>re-rendering. The only portions of the MPEG that would need to be
>re-encoded would be the video "in" points after removing commercials
>and audio fades on both in and out points..
>Transcode the final product to 720x480 (i.e. MPEG-2 suitable for DVD).
>
>Any tools that will do this? I should've payed attention when the MPEG
>people at work were offering instruction - I'd have such a tool
>written by now.
>
>-Don
>
> -----Original Message-----
>From: Don Starr [mailto:don@s...]
>Sent:	Wednesday, May 29, 2002 8:03 PM
>To:	ExtractStream@yahoogroups.com
>Subject:	RE: [ExtractStream] Re: Audio Synchronisation - Does Anyone
>have the Answers ?
>
>How does one get VirtualDub to accept MPEG2 files? In attempting to
>load my .m2v file, I see "VirtualDub cannot decode MPEG-2 video
>streams".
>
>Is that what you meant by "uncompressed mode" (i.e. get away from
>MPEG-2 first) ? If so, do you have a suggestion for a tool to do
>this? I'm really trying to avoid transcoding (or decoding, editing,
>re-encoding). Going back and forth between lossy compression formats
>doesn't seem like the right way to archive video.
>
> -----Original Message-----
>From: Michael Loftis [mailto:mloftis@w...]
>Sent:	Wednesday, May 29, 2002 7:54 PM
>To:	ExtractStream@yahoogroups.com
>Subject:	Re: [ExtractStream] Re: Audio Synchronisation - Does Anyone
>have the Answers ?
>
>I use virtualdub, it allows you to adjust in msec increments the
>offset
>from which the audio starts. I imagine you could use it in
>"uncompressed" mode to get the streams into sync, then feed that into
>TMPGEnc? Dunno. I don't do the DVD thing yet.
>
>Don Starr wrote:
>
>>Correction: the name of the MPA file generated by DVD2AVI is "show
>>
>MPA
>
>>T01 DELAY 0ms.mpa".
>>
>>It is also identical to the M2A file generated by the vsplit embedded
>>in Tivo Client, which tells me that I can eliminate my steps 2 and 3
>>below, instead using TMPGEnc's NTSC DVD wizard to generate a 720x480
>>MPG from the original m2v and m2a.
>>
>>That still leaves me with the big audio offset, however.
>>
>>
>>-----Original Message-----
>>From: donstarr [mailto:don@s...]
>>Sent:	Wednesday, May 29, 2002 7:39 PM
>>To:	ExtractStream@yahoogroups.com
>>Subject:	[ExtractStream] Re: Audio Synchronisation - Does Anyone have
>>the Answers ?
>>
>>Here are my steps, similar to Mark's yet I'm getting monstrous audio
>>offsets:
>>
>>1. Use the new Tivo Client and tserver_mfs (from the 27 May 2002
>>version of tytool2.zip) to extract and split (e.g. yielding show.m2v
>>and show.m2a).
>>2. TMPGEnc -> MPEG Tools -> Simple mux to generate show.mpg from the
>>m2v and m2a files.
>>(playing this mpg in PowerDVD exhibits the audio offsets)
>>3. Use DVD2AVI to generate show.d2v and show.mpa from show.mpg
>>4. TMPGEnc wizard (DVD NTSC) to generate show_dvd.mpg from show.d2v
>>and show.mpa
>>
>>The resulting show_dvd.mpg is still exhibiting ~150ms (guess, by
>>observation) audio offset, in both PowerDVD and WMP. The split
>>operation in Tivo Client told me that the audio was 7 ms early.
>>
>>Do I have extra steps in there (i.e. muxing to the first MPEG, then
>>generating the NTSC DVD MPEG in DVD2AV)? Am I totally missing some
>>setting or option in one of these that would give me the audio
>>offsets?
>>
>>-Don
>>
>>
>>
>>
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>>
>>
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>>
>
>
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