Program switches audio track priority of dual-audio assets

[PBear]

This is related to my previous post, but I figured the issue was different enough to warrant a separate thread.

When converting an SVCD with dual audio tracks, SVCD2DVD reverses the order of the tracks - so that the main track becomes the secondary track, and vice-versa. This has happend with three different SVCDs so far, so it seems to be SOP.

Now when I play the DVD, the commentary track plays by default. In order to get the regular movie soundtrack, I have to switch to Audio Track 2 on my DVD player.

Don't know if the SVCDs actually do lay the audio tracks down in reverse order (i.e., the commentary track is, what is it called?, 0x80?, and the main audio is the next one, 0x81?), but any player I've ever used to play back the SVCDs has defaulted to the main audio, not the commentary track - so at least the header info is correct in the SVCDs.

It (reversing them) might also be something VCDGear is doing when I import the SVCD files onto my hard drive as regular MPEGs - don't know.

Is there any way to switch the audio track priority in SVCD2DVD before output? This is really annoying when playing back the movies.

[ChrissyBoy]

I have not seen this... Can you post a log of a run which exhibits this issue please?

[PBear]

OK, here you go:


svcd2dvdlog-20071109213732.txt

[ChrissyBoy]

PBear,

Can't really see what is going on as the files have already been processed. Can you do a quick run with a single file - say Movie1 1.mpg (the original) and i will take a look at the new log.

Thanks.

[PBear]

OK, hope this will help (can't really see how, since using only one asset file creates no conflict between files with different numbers of audio tracks and there is no crash - but, if it does, then good).

svcd2dvdlog-20071111023415.txt

Edit:
Ack! Sorry about the irrelevant comment above. Got the threads mixed up (this one's not the one about the crash).

[ChrissyBoy]

ok but isn't this about stream switching rather than conflicting?

[PBear]

Yes - see my edit above.

(My bad)

[ChrissyBoy]

Also the asset has already been processed and so will not be processed again:

02:34:16: Leaving Movie1.1_S2D.mpg alone. File has Nav Packs

So can you use the original so i can see the initial processing as i suspect this is where the issue is.

[ChrissyBoy]

Yes - see my edit above.

(My bad)

:P

[PBear]

My only excuse is it's late and I'm groggy. Did not divine what you meant by the phrase "already been processed" (thought you were referring to the muxing). Here it is again ... using a raw input file.

svcd2dvdlog-20071111025815.txt

Edit: I see, in the file, that it's apparent that the commentary track is listed first (judging by the bitrate), even though it uses a higher ID number (0x1c1 compared to 0x1c0). Perhaps it is VCDGear that's doing the switching [?].

[PBear]

No, it's not VCDGear. This time I copied the file, AVSEQ01.MPG, directly from the SVCD to my hard drive. (SVCD2DVD will not handle any .DAT files I've tried, but does accept .MPG files by doing a RIFF conversion when importing them as assets.)

As you can see, the result is the same as before. Maybe the tracks are reversed on the SVCD itself but, like I said, when I play back the SVCD, the DVD player will always default to the correct main track.

Maybe it's the Stream ID, rather than the stream number, that's the key - and maybe it's because the streams are in backwards order (the higher ID first, in stream #1) that ffMPEG is reassigning the stream IDs in its output. (I often use ffMPEG to convert MPEG-4 files and I've had to remap the audio tracks on the ffMPEG command line to get them to come out right on several occasions.)

svcd2dvdlog-20071111032623.txt

[ChrissyBoy]

Ok i agree with you. Can you use the makesample tool in the Tools folder to email me a sample... say 5MB. Even better if you could put the files somewhere so i could take a proper look, as i can then investigate the other issue. If so, PM/Email me otherwise a sample will do for now.

[ChrissyBoy]

Thanks for the samples. There is now an option to force the audio stream order based on stream id (which works well on your sample!).

[PBear]

New option works great. Thanks very much.