sound quality decreased

[kimo]

dear genius
after finaly being able to produce the *avi file with sound from the dvd.I had 2 bad results
1) the sound isnt syncronising with the film.
2) the sound quality is BAD .
being its musical fim,that doesnt give me much hope
thanx for your preveus helps
I just hope i'll be able to get a satisfying result using GKnot before my days on earth are over
(leaving planet earth soon ):sly:

[UHT]

for better quality audio follow one of the audio guides, none of them will give you "bad" sounding audio

the sync issue could be one of a number of things..what kind of audio file do you have? what is the ac3 delay value? what program are you using for playback?

[kimo]

dear genius
for the sound i was using .mp3 file format and not .ac3 i tried once with (128kb/s) and once with (96kb/s) in both cases the audio file once mixed with the video file gets very lousy .but before mixing the audio file alone is good .
2) i play the final .avi file with wmplayer the pic isnt syncronising with the audio.:angry:
i used 2 softwares to get that job done,Gknot and easydivx and in both cases i had the same result the voice isnt going with the movi and the sound quality is lousy
and for the record i decrypted the movi with DVDdecrepter.(great software )

[UHT]

the ac3 file which you encode to mp3 has a delay value, when it is demuxed using dvd2avi then it is part of the file name something at the end such as "-89 delay.ac3" you need to use this value when muxing the audio and video at the end to get syncronization

[kimo]

Dear UTH
the file loox like this ( mymovi AC3 T01 3_2ch 448Kbps DELAY 0ms.ac3) and as u can c the delay value is 0:confused:
any sugestions amigo:D

[UHT]

its UHT u cheeky n00b!

if u r using 96kbs for ur audio then i would imagine it will sound bad, thats a very low bitrate, dont go below 128kbs ABR, that could be your sync issue, is your hardware up to vbr/abr mp3 files? it may also be a framerate issue

[gooki]

When you said:

"for the sound i was using .mp3 file format and not .ac3 i tried once with (128kb/s) and once with (96kb/s) in both cases the audio file once mixed with the video file gets very lousy .but before mixing the audio file alone is good."

It apepars that when you are muxing the mp3 file with the video file you are re-encoding an already encoding mp3 file hence the crap audio quality.

The solution: make sure you have direct stream copy selected when muxing audio + video in virtualdub/nandub.

Hope that helped.

[rmatei]

As for desync, you might want to tell us your encoding method in detail. That way we'll be able to help you better. (what programs in what order and with what settings)

[jggimi]

If you let GKnot do your audio encoding, you shouldn't see sync problems. However if you encode audio below 128kbps, there are special considerations that will affect both sync and quality if ignored. From the Help tab in Gknot:audio-bitrates below 128 (in lame) can cause sync-problems (and sound terrible), because lame is automatically
downsampling to 32 or even 22kHz. i highly recommend to use
128 or 160 and nothing else. to avoid downsampling you have to add "--resample 48" to your lame commandline options if
you encode at low bitrates.You might want to also read Doom9's Guides for the tools you are using, if you have not done so already.