Hardware player out of sync audio

sherman_oakes · 21st May 2006, 07:48

Ok i've authored my own DVD, and the audio drifts on my hardware player and not on my software player. On another hardware player, it plays fine.

So the question is, what is a safe enough figure for video bitrate on a DVD such that the decoding process on most hardware players doesn't cause a lag in the audio?

21st May 2006, 10:38

Get a new frickin player! Simple!

Audionut · 21st May 2006, 12:16

This has been discussed a couple of times. You should use search.

Having said that, there are various suggestions as to what is the max.

The dvd specs allow for a max bitrate of 9800kbps combined audio/video.

Quote:

what is a safe enough figure for video bitrate on a DVD such that the decoding process on most hardware players doesn't cause a lag in the audio?

You should be plenty safe with max (not average) 8000kbps for video.

If you are still having problems, it could be the dvd discs you are using.

sherman_oakes · 22nd May 2006, 04:29

Well the search function returns too many unrelated links.

To paraphrase most of the solutions:

1. audio no sync drift - shift audio track a few ms ( for rips )
2. use pcm
3. use a different encoder
4. uncheck strict gop control VBR - ( unsure of the settings )
5. chapter markers to stop sync problems ( for rips )
inc your suggestion
6. max bitrate 8Mbps
and the popular
7. bundle a new DVD player with the DVD.

4 & 6 are the best solutions so far for home dvd authoring. For 2 i'm not too sure that makes much sense, since i think it's the video streaming that causes hardware players to lag. 3. isn't a good solution unless getting the encoders are cheap. 5. seems like an ok solution except that there's work in inserting chapter markers. 6. capping it at 8Mbps means the pictures aren't as good as they can be. 4. slightly counter intuitive, since strict gop bitrate control should mean no sudden spikes in the bitrate.

Audionut · 22nd May 2006, 07:02

For me,

2. If pcm works, indicates that the hardware is having trouble decoding the other streams. It would be the absolute last thing I would try.

3. There are plenty of excellent freeware encoders.
http://forum.doom9.org/showthread.php?t=110594
http://forum.doom9.org/showthread.php?t=110888

However, unless you are using a very old encoder, I doubt that would be the cause of the problems.

4. Agree that it seems counter intuitive, but it wouldn't hurt to try. Low priority.

5. If you are ripping from a dvd, dvddecrypter generates chapter files that can be imported into dvd authoring software.
Some authoring software can automatically insert chapter markers, else, just to check, the chapters don't have to be perfect, just through a few in here and there to test.
If that fixes the problem, it gives you somewhere to start from.

6. Excatly. But your hardware might have problems with anything higher.

7. Um. Not the best solution.

Things you can try.

1. Scan the disc with Nero cd\dvd speed
Post your results of the quality scan of the disc in question.

2. Try authoring with video encoded with a lower MAX bitrate.

3. Try different authoring software.

Remember, the only thing you should be doing is trying to find what breaks clean playback.

21st May 2006, 07:48	#1 \| Link
sherman_oakes Registered User Join Date: Apr 2006 Posts: 5	Hardware player out of sync audio Ok i've authored my own DVD, and the audio drifts on my hardware player and not on my software player. On another hardware player, it plays fine. So the question is, what is a safe enough figure for video bitrate on a DVD such that the decoding process on most hardware players doesn't cause a lag in the audio?

21st May 2006, 10:38	#2 \| Link
Bird Brain Guest Posts: n/a	Get a new frickin player! Simple!

22nd May 2006, 04:29	#4 \| Link
sherman_oakes Registered User Join Date: Apr 2006 Posts: 5	Well the search function returns too many unrelated links. To paraphrase most of the solutions: 1. audio no sync drift - shift audio track a few ms ( for rips ) 2. use pcm 3. use a different encoder 4. uncheck strict gop control VBR - ( unsure of the settings ) 5. chapter markers to stop sync problems ( for rips ) inc your suggestion 6. max bitrate 8Mbps and the popular 7. bundle a new DVD player with the DVD. 4 & 6 are the best solutions so far for home dvd authoring. For 2 i'm not too sure that makes much sense, since i think it's the video streaming that causes hardware players to lag. 3. isn't a good solution unless getting the encoders are cheap. 5. seems like an ok solution except that there's work in inserting chapter markers. 6. capping it at 8Mbps means the pictures aren't as good as they can be. 4. slightly counter intuitive, since strict gop bitrate control should mean no sudden spikes in the bitrate.

22nd May 2006, 07:02	#5 \| Link
Audionut Registered User Join Date: Nov 2003 Posts: 1,281	For me, 2. If pcm works, indicates that the hardware is having trouble decoding the other streams. It would be the absolute last thing I would try. 3. There are plenty of excellent freeware encoders. http://forum.doom9.org/showthread.php?t=110594 http://forum.doom9.org/showthread.php?t=110888 However, unless you are using a very old encoder, I doubt that would be the cause of the problems. 4. Agree that it seems counter intuitive, but it wouldn't hurt to try. Low priority. 5. If you are ripping from a dvd, dvddecrypter generates chapter files that can be imported into dvd authoring software. Some authoring software can automatically insert chapter markers, else, just to check, the chapters don't have to be perfect, just through a few in here and there to test. If that fixes the problem, it gives you somewhere to start from. 6. Excatly. But your hardware might have problems with anything higher. 7. Um. Not the best solution. Things you can try. 1. Scan the disc with Nero cd\dvd speed Post your results of the quality scan of the disc in question. 2. Try authoring with video encoded with a lower MAX bitrate. 3. Try different authoring software. Remember, the only thing you should be doing is trying to find what breaks clean playback.