Changing Default Audio Track?

[jdobbs]

I have a DVD I'm trying to back up (using the IFOEDIT/CCE method) that has several audio tracks. When I reencoded the file I removed all audio tracks except the English Dolby 5.1 track.

Unfortunately, in the original configuration track 1 was DTS, and track 2 was Dolby 5.1 -- and track 2 was the default. After recreating using my CCE encoded file, when I start the DVD and play the movie I get no sound -- it tries to default to track 2 (which no longer exists). I have to use the menu and select "DTS" to get my sound track.

Is there a way I can use IFOEdit to change the default at startup to track 1 (which is now Dolby 5.1)?

Your help would be appreciated.

[jdobbs]

Got it.

I used VSTRIP to change the stream ID to match track 2 (0x81)

I would like to know, though, if there was an easier way to do it with IFOEdit. Anybody had this problem before?

[jdobbs]

Never mind. I found that one too. For those who are interested you simply manipulate the high order byte in the Audio stream status entries (offset 0000000C - 0000001A) in the PGC to change a stream's ID. I'll probably add an option to IFOUpdate for when I run into one of these.

It's a hell of a lot faster than running your VOB through VSTRIP.

[TRILIGHT]

Hey, Jdobbs! I just wanted to thank you for the IFOUpdate program! I finally got a chance to use it tonight and it worked GREAT!! It's a major advantage and time-saver! It's always the little things. ;) Thanks for taking the time to write it!

Quick question in reference to a post I just made. I'm trying to figure out what fields I would need to copy over from my authored IFO file so that the subtitle works. It is still subtitle 1 (English) and so I thought the original IFO would access it correctly. Apparently not though. I figure I must have to copy over some subtitle info from the authored IFO but I can't figure out exactly what. If you know, I'd appreciate it! Thanks!

[Cayne]

great thing @ jdobbs

worked like a charm, but I additionally recommend to also change the language setting in the Title Set Attibutes.

[asifanwar]

Hi,

First of all, thanks for the great explanation of how to get a SpruceUp/CCE compilation to be merged into IFOedit.

Two things:

1. where can I get IFOUpdate? The link on Doom9's download page actually points VOBedit and Google cant find any pages with the word 'ifoupdate' on them...

2. I have exactly the same problem as you with regards DTS on audio1 (which I scrapped) and DD5.1 on audio 2. But of course, my SpruceUp files have DD5.1 on audio1 which gives silence as the disc defaults to 'audio2' which is no longer there.

I read your post about using IFOedit. I see the addresses to which you refer, but dont quite understand what to do with them. Can you elaborate please?


Thanks for everything!

[jdobbs]

Here's (http://forum.doom9.org/attachment.php?s=&postid=148005) the link to IFOUpdate.

[jdobbs]

As for audio changes:

It can get a little tricky and you have to play it by ear depending upon which track is DTS. Look at two locations. First look under VTSI_MAT at offset [00000104]. There it tells you which tracks are set to what kind of encoding. Doubleclick on the one that is DTS and change it to match yours (Dolby AC3). Then look in the PGC at offset [0000000C] -- that is where the audio stream IDs are stored. One of the points to remember is that as near as I can tell, DTS is typically set with a stream ID of 0x88. But if you look at the offset in the PGC you will see that the location holds a value of [8000] (that's hexadecimal, it is 32768 in decimal). From what I gather, it seems that when the track is DTS the player "knows" to add the extra "8" (there are only 7 possible tracks!) If someone knows more about this, I'd love the information.

Since I normally do english DD 5.1, my authoring package creates a stream that has an ID of 0x80 - so making the first change fixes it. But if you want to change it to a different ID, modify the value to match your stream. Since the upper bits define the stream use these values: 32768=0x80, 33021=0x81, 33280=0x82, etc.

I know it sounds a little confusing, but I hope that's enough to get you started.

[asifanwar]

Thanks for both messages. I am going to play around with it now.

Kind regards.

[pumucki]

Hi!

I've got similar problem. I want to set DTS track as default track,
having two tracks. I tried but when I start the DVD and play the
movie I get no sound. I have to use the audio button and only
sounds then 5.1 track.

Please could anyone explain and easy way perhaps with IFOEDIT


Thanks!!!! :)

[2COOL]

Read this guide...http://forum.doom9.org/showthread.php?s=&threadid=46909.

Follow the guide to set your kept audio languages back to its original stream positions and learn about audio swapping at the end of the guide.

[Fmazzanti]

Somewhat off-topic, but since you've been talking about this, I'm curious to hear your opinions. You say you keep your DTS track and remove 5.1 ones... well then your DVD won't be useful unless the DVD goes through a DTS capable device as an A/V recorder, isn't it? I mean, standar TV won't play any sound. And BTW, DTS tracks take twice the space a 5.1 track takes. Last movie I backed up had one of those, but it was 730Mb more or less... now this eats almost 15% of DVD-R space, and some of these Mb could go to video quality instead...
Uhmm... are you sure it is really worth the hassle?

[pumucki]

Hi there!!!


well my idea is to use it in my home dvd player, do you think it's
better to leave DD 5.1 instead of DTS?? it's not such as improvement?

[Fmazzanti]

DTS takes twice the space of a 5.1 track, so there's twice info and this is supposed to mean better quality. However, as in the video world, that depends on many things. If you've got a Creative package or something with similar quality, don't you bother to keep DTS. You need a good receiver/speaker set to see the difference... and even in that case, some people would say it is better to keep it and some other would tell you it's a waste of space. According to the amount of information in each track, DTS must be better. How much? That depends on your equipment and ears...
I was asking not because of this, but just because of the big amount of space it takes in a DVD-R, so I would like to know what people think about this...

[ody96]

Fmazzanti, here's my experience.

There is significantly difference, or I should say very significantly between DTS 5.1 and DD 5.1. After I bought a home theater receiver that has a built in DD/DTS decoder and a nice 6.1 speakers, and playback a DVD (Gladiator Signature Edition and LOTR Special Edition) that has both audio tracks, from what I hear, the sound from DTS are much louder (especially bass/sub) and clearer. DTS will produce every tiny sound so it is much richer than DD.

I think it's comparable to save a JPEG file of quality 95% (DTS) with 50% (DD5.1). The picture of 50% will degrade or pixelate.

Now I throw away my old backups and re-backup with DTS included and DD excluded. But in the market today, there are not a lot DVD with DTS soundtrack.

[Fmazzanti]

@Ody96,
I also have a nice receiver coupled with good sounding speakers... and I said what I said just because I've also made the tests and yes, there's a difference, but I would say it is much more subtle than what you say for sure. And if DD5.1 is much more extended than DTS, there should be a reason for that after all...
Well I don't know, just gave my 5 cents. Still, 700Mb for a single audio track may be reasonable if you do movie only. But if you put in menues, extras, subtitles, 2 or 3 audio tracks... doesn't this suck much valuable space from your DVD-R?

[ody96]

Fmazzanti,

Yes you're right, it depends on our equipments. If one only has dvd player without DTS decoder, than it's useless. If the player has DTS decoder, then depends on your ear as you said. Before I do backups, I will listen to both audio (DD and DTS). A good and serious production house will produce a good audio, even only DD and not DTS. A good sound for example Starwars Eps 2 or Harry Porter Chamber of Secret (DD-EX 6.1). A bad one like "Bring It On" Collectors Edition with both DD5.1 and DTS5.1, the DTS audio track is not superior, I would rip the DD5.1 only rather than DTS, to save DVDR space for more video quality.

Anyway, DTS "support" from "our friends" is not as many as DD AC3. I cannot find DTS Delay Corrector yet. My new project is "mixing" all dvd video-music that I love into one DVDR, such as Eagles (Hotel California, DTS), Josh Groban (with Andrea Corr, DTS), Tarzan (Phil Collins, DD4.1) etc. Although I succesfully fix the VOB/Cell ID numbering using vStrip and IFOedit's DVD Author, but I couldn't fix the DTS audio delay.