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gi1242
Tux's lil' helper
Joined: 29 Jul 2004
Posts: 146
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 Posted: Sat Sep 11, 2004 8:06 am Post subject: Backing up DVD: Problem with audio sync [solved] |
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Hi all,
I've a few dvd's I wanted to backup, and am looking around for the best way to do this. I've found many helpfull threads so far, but each had it's own problems. I describe a few below. Any help will be MOST welcome!
First method and problem
I tried to use streamdvd and dvdauthor as follows:
| Code: |
streamdvd -i /dev/dvd -t 1 -s 0xe0,0x80 -f 1.3 > movie.vob
dvdauthor -t -o /movies/movie1 -f movie.vob
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(Actually I muxed in subtitles using submux-dvd before running dvdauthor). The problem I had was that my audio was messed up. When I played it on my standalone DVD player, all the sound only came from the center chanel. The movie was still watchable though. But a nice 5.1 surround sound would be prefferable.
Second method and problem
I tried using transcode and friends.
| Code: |
mkfifo aud.fifo vid.fifo
tcextract -i vid.fifo -t vob -x mpeg2 -a 0xe0 | tcrequant -f 1.3 -o video.m2v &
tcextract -i aud.fifo -t vob -x ac3 -a 0 > audio.ac3 &
tccat -i /dev/dvd -T 1,-1 | tee aud.fifo vid.fifo > /tmp/title1.vob
tcmplex -i video.m2v -p audio.ac3 -m d -o movie.vob
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(Again, I mplexed in subtitles in here). However this time I found that the audio sync was way off (more than 30 seconds). I have no idea why / how. Any ideas?
This transcode methode is kind of nice (especially since I can extract audio / video, subtitles) all at one go without copying the DVD to my hard disk or reading the same track of the DVD three times over. However I can't figure the audio sync out ... Any ideas?
Thanks in advance
GI
Last edited by gi1242 on Wed Feb 23, 2005 7:57 pm; edited 1 time in total |
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CybeRDukE
Tux's lil' helper
Joined: 16 Jul 2002
Posts: 92
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| Posted: Sat Sep 11, 2004 8:14 am Post subject: |
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i recommend lxdvdrip
that's what i use and it's great! damn fast and very simple when once set up. maybe you could just try this first. but i don't know how well subtitles work. there were some problems when i tried last time, but don't know if it's been already fixed.
good luck |
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gi1242
Tux's lil' helper
Joined: 29 Jul 2004
Posts: 146
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| Posted: Sat Sep 11, 2004 3:16 pm Post subject: |
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| I tired lxdvdrip, but couldn't get the subtitles to work. Maybe it was because I used the streamdvd method instead of transcode parallel. Will try again ... |
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gi1242
Tux's lil' helper
Joined: 29 Jul 2004
Posts: 146
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| Posted: Sun Sep 12, 2004 6:39 pm Post subject: |
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| CybeRDukE wrote: | | i recommend lxdvdrip |
I retried it. The subtitles worked if I used transcode parallel (instead of stream dvd) as my ripping method. 
| gi1242 wrote: | First method and problem
I tried to use streamdvd and dvdauthor as follows:
| Code: | streamdvd -i /dev/dvd -t 1 -s 0xe0,0x80 -f 1.3 > movie.vob
dvdauthor -t -o /movies/movie1 -f movie.vob |
(Actually I muxed in subtitles using submux-dvd before running dvdauthor). The problem I had was that my audio was messed up. When I played it on my standalone DVD player, all the sound only came from the center chanel. |
Well, I don't know what the error was, but know a workaround. Instead of running dvdauthor from commandline, I made an xml file (as described in the dvdauthor man page). This let me put in chapers wherever I wanted too. Worked fine after this, but I decied that it was too 'unautomated' for my taste, and decide to use a different method to backup my dvd's.
| gi1242 wrote: | Second method and problem
I tried using transcode and friends.
| Code: | mkfifo aud.fifo vid.fifo
tcextract -i vid.fifo -t vob -x mpeg2 -a 0xe0 | tcrequant -f 1.3 -o video.m2v &
tcextract -i aud.fifo -t vob -x ac3 -a 0 > audio.ac3 &
tccat -i /dev/dvd -T 1,-1 | tee aud.fifo vid.fifo > /tmp/title1.vob
tcmplex -i video.m2v -p audio.ac3 -m d -o movie.vob
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(Again, I mplexed in subtitles in here). However this time I found that the audio sync was way off (more than 30 seconds). I have no idea why / how. Any ideas?
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Again, I don't know why the above does not work. However I think I *might* know a workaround. When running lxdvdrip with the "transcode parallel" method, I saw it executing almost the same commands as above, with a few differences:
- The fifo's were buffered (using the 'buffer' program). I don't know if this makes much / any difference.
- It used mplex instead of tcmplex to mplex the stream!
If anyone knows what these small differences do to make it work, please enlighten me. If not, I'm content anyway cause I now have a satisfactory method of backing up my precious DVD's
GI |
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Zyne
Guru
Joined: 08 Jun 2004
Posts: 334
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| Posted: Sun Sep 12, 2004 6:57 pm Post subject: |
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I have been trying to do the same thing...
However, I was trying to shrink most of the dvd's, so that they would fit on a regular DVD-R (4.7 GB)
During my research I stumbled on a LOT of ppl that used dvdshrink through wine to backup their dvd's, but for some weird reason that wouldn't work for me...
However, I DID find a solution that was definitely good enough for me...
http://forum.hardware.fr/hardwarefr/OSAlternatifs/sujet-36304-1.htm
few disadvantages about this:
1. the page and the script are entirely in french (which wasn't really a problem for me)
2. you can not keep the menu structure.
3. you have to patch DVDAuthor with a customized patch
advantages:
1. you get to choose how many and which audio-stream you want to keep
2. you get to choose how many and which subtitle-strem you wish to keep
3. size is definitely under 4.7GB, and the shrinking happens automagically
the result is great! as a test I backed up a collector's edition of Gladiator with 5 different audio-languages, and 4 subtitles. the resulting dvd was 4.4GB, and quality was still good imho...
if need be, I'm willing to translate the entire thing to english, but I'm gonna ask the original author first. |
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gi1242
Tux's lil' helper
Joined: 29 Jul 2004
Posts: 146
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| Posted: Sun Sep 12, 2004 7:22 pm Post subject: |
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| Zyne wrote: | I have been trying to do the same thing...
However, I was trying to shrink most of the dvd's, so that they would fit on a regular DVD-R (4.7 GB) |
I guess I neglected to mention, both the above methods shrink the dvd (the -f 1.3 switch to streamdvd, or the tcrequant command do it).
I checked your link out. Unfortunately I don't know french (argh). But lxdvdrip seems to do the same, with similar advantages / disadvantages.
- Some of the documentation is in German (I don't know German, but still managed to use it.)
- I don't think you can keep the menu structure / extras. The chapters are preserved though
- You can choose the title, which audoi stream / subtitle / etc, and reshrink if required (manually / automagically).
GI |
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Zyne
Guru
Joined: 08 Jun 2004
Posts: 334
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| Posted: Sun Sep 12, 2004 8:30 pm Post subject: |
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I just found another program that does about the same, but has a graphical UI, and is not in french
http://www.gff-clan.net/cgi-bin/hdr.pl?page=ldvd9to5&lang=en&lang=en
only downside atm: it's mostly german and a very poor translation to english imho (although I haven't tested it yet)
I also heard good things about vamps (DVDshrink for linux). I believe I found the link in the documentation forum, and I'm pretty sure the program itself is in portage, although it's ~x86 |
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gi1242
Tux's lil' helper
Joined: 29 Jul 2004
Posts: 146
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| Posted: Mon Sep 13, 2004 5:18 pm Post subject: |
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Argh. This is so frustrating. All the good programs are primarily French / german. I don't know either. Grr. I spent HOURS trying to read the source of lxdvdrip, but didn't get anywhere cause all the comments are in German.
| Zyne wrote: | | I also heard good things about vamps (DVDshrink for linux). I believe I found the link in the documentation forum, and I'm pretty sure the program itself is in portage, although it's ~x86 |
Yep. I tried it. But for some reason it doesn't run on my system. The german source / docs didn't help much either, and I decided to go back to transcode.
If I ever get anywhere, I'll post it. And if you find anything (even french / german / zulu), I'd love to know. Sometimes it might still be usable
Thanks,
GI |
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CybeRDukE
Tux's lil' helper
Joined: 16 Jul 2002
Posts: 92
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| Posted: Mon Sep 13, 2004 10:40 pm Post subject: |
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i'm german but reading the lxdvdrip.c is frustrating! imho the program is an good example of bad software engeneering. purely impreative programming with a function containing hundreds of lines of code and all that for doing things that scripting languages were made for. that feels so wrong. so i guess your problems are not caused by the german language but by the source code itself 
nonetheless, the programm is cool and it works and as long as i don't have to extend it, it's ok i guess.
about the vamps program, i think you can't say it the linux version of dvd shrink as it just doies the requantization and not the fancy stuff dvd shrink does like previewing, stripping titles etc. but i never used it, just read about it and i reeaaally hope i'm wrong, as i'm using dvd-shrink with wine right now. btw, works quite well, except previewing. |
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Gentree
Watchman
Joined: 01 Jul 2003
Posts: 5350
Location: France, Old Europe
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| Posted: Tue Sep 14, 2004 7:56 am Post subject: |
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You could try http://trans.voila.fr/ or some of the other links on http://bablefish.org to translate the doc or the french thread you noted.
I just had a look passing the url of your thread and its a bit pidgeon-english on small fragments of text like the posts but it is probably enough for you to make sence of it.
HTH 
_________________
Linux, because I'd rather own a free OS than steal one that's not worth paying for.
Gentoo because I'm a masochist
AthlonXP-M on A7N8X. Portage ~x86 |
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gi1242
Tux's lil' helper
Joined: 29 Jul 2004
Posts: 146
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| Posted: Wed Feb 23, 2005 7:51 pm Post subject: |
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I *finally* figured out the original problem with audio sync. It looks like the sync offsets are lost when the stream is remplexed. A wise person suggested that the offsets can be obtained by using mpeg2desc (comes with dvdauthor):
| Code: | | $ mpeg2desc < stream.vob | grep pts | head |
The audio offset is the difference between the first video pts, and audio pts. Pass this to mplex with -O and it works
As for lxdvdrip, I've decided I hate it. Newer version (1.4) seem to have the transcode parallel method broken. Further, it sometimes screws up and backs up only half my title. Hacking the source with german comments and variables is not an option for me. A little sh script of the above will probably be better. |
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