TMPEGENC - DivX to VCD: Incredible lipsync problem !

[arminio]

I simply can't figure out why this happens - I have 2 DivX files that can't be converted to VCD without lipsync !
Main problem is that video and audio is perfect in the beginning and start to go out of ny after few minutes and things become worser and worses until the end.

I tried everything - using external WAV as audio (I extracted and converted MP3 sound into plain WAV) but didn't help. Also, audio gap won't help because lipsync is progressive.

Any ideas ?

[MaSo]

Have you tried converting the video and audio seperately and then multiplexing them together when there both done?

Know it sounds a bit odd but I had kind of a similar problem witha HQ Divx and this seemed to sort it out.

Cheers
MaSo

[arminio]

I tried using MPEG2VCR but result was worser lipsync. I should try mux/demuxing with TMPEGEnc ... but I am afraid this won't help either !

[arminio]

... definitely won't help !
Just tried muxing with TMPEGEnc nad BBMPWG but the same result - progressive lipsync occurs !

[relic13]

OK, I'm a newbie in this video stuff so I don't claim to actually know anything but this is the exact symptom I had with some recording studio software when 2 recorded audio tracks went progressively out of sync. The fix for this (which only partially worked for me) had to do with the sampling rate of the computer's sound card (48Khz) vs the rate used to record the audio track(44.1khz). I re-recorded the audio at the same rate as my sound card and things got better but not totally. Anyway, may not apply here at all but just something else you might look at.

[arminio]

My sound rate is 44.1 KHZ already in DIvX ... looks like this is not the reason I still can't figure out why this happens !

[Vejita-sama]

Are the audio and video in sync in the original DivX files (I've seen some that aren't)?

If so then just use TMPGenc to encode the video, and extra the audio with another program (azith) then mux them, might help.

[RCP]

Had a similar problem with a different encoder and and it was a frame rate problem. Sound is at
24 frames/sec and video was being reencoded at 29.9 fps. The farther into the movie the further off it got. Try changing the frame rate in TMPG.

[porto]

Hi,

I had exact the same probs with my divx to mpeg1 conversions; lipsync starts fine but within some minutes it shifted out of sync with at the end an 1 to 3 seconds difference between the streams... very shitty...

I kinda sorted out this prob by:

1. read the DivX stream into VirtualDub;

2. select in the first scrollmenu: Save Wave..., give it a name and up you go;

3. read the DivX stream into Premiere (premiere won't recognize the audiostream so steps 1 and 2 were necessary for audio in your mpeg-1 stream... and that gives the movie more excitement, not?!)
(ATT: IMMEDIATELY CLICK ON THE DIVX AUDIOSTREAM AND -=DELETE=- IT !! Trying to play the stream will CRASH premiere.... well, my premiere does anyway... <sigh&gt;

4. open in premiere the just made .WAV file and put it on the audiopart of the timeline beneath the videostream;

5. well, I guess you know how premiere works from this part, it's from now just the same as with any other
.AVI (or whatever format) stream. --> split the movie, save the projects and encode the damn things!

One little encoding suggestion: make use of TMPGenc with the avisynth frameserver plugin for premiere.... I tried Xing and LSX but TMPGenc produces a MUCH sharper and smoother image (settings: 352*288, high quality, fullscreen). 1 hour encodes in 5 hours (P3 700) but WHAT THE HELL?! if you're smart, it does the encoding at night or when you're on your job or at school.

GOOD LUCK and post some experiences.....!


ps. sorry for my bad english, i'm Dutch! <duh!>

[next]

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On 2001-08-08 03:32:23, arminio wrote:
I tried using MPEG2VCR but result was worser lipsync. I should try mux/demuxing with TMPEGEnc ... but I am afraid this won't help either !
</BLOCKQUOTE></FONT></TD></TR><TR><TD><HR size=1 color=black></TD></TR></TABLE>

Mpeg2vcr is one of only a few programs that can fix this problem. When you mux you have an option to offset the audio. I'm able to get perfect A/V sync using this option.

[arminio]

Hey guys - you didn't read too carefully !
The thing is: original DivX is perfectly synchronized. I tried everything - from useage of exteral WAV (made with VirtualDub - really WAV not MP3 with WAV extension), by muxing with MPEG2VCR (A/V synth option can't help because lipsync is progressive).

Only thing I didn't try is useage of Premiere ...

[bbb]

Tell us your Tmpgenc settings that you used to covert from divx to vcd.

Did you use Tmpgenc beta 12, 12a, 12i? Did you use lame as the sound encoder? Try the latest versions of tmpgenc and lame; it helps.

Did you use inverse telecine? If so, what type of telecine option? You might try reencoding without inverse telecine to increase your chances of getting sync. The reason is because some divx are encoded with very nonstandard framerates like 18 fps with 50 internal fps. You should avoid IVTC with divx sources to avoid these hassles.

[arminio]

I use TMPEGEnc 12e. I use standard VCD settings with only changes in option "motion search precision" - I set it to HIGH QUALITY (SLOW).
So, Inverse telecine is off. Also, I use TMEPENC internal audio converter and external (extracted and plain) WAV as source.

DivX I convert is 25 FPS with 44,1 kHZ audio



<font size=-1>[ This Message was edited by: arminio on 2001-08-09 13:47:28 ]</font>

[herzet]

I had the same problem with a 2cd divx, in the beginning it was perfect in sync and after 6 min it went out of sync I've been busy with it for 3 days now and I found a solution, hope this will work for you also.

first open the divx in vdub]
the hit ctrl-r there wil popup a box called video frame rate control, then select: Change so video and audio durations match, then ok.

Then run auxsetup.exe (located in your vdub dir), select install handler and then ok
goto file -> start frame server click start and select a filename like test.vdr and save it.This wil porvide you with a box called: Frameserver mode - VirtualDub, check
at the bottom of the box if you have: Frameclients installed: AVIFile only, if so
then start TMPenc load your svcd or vcd template after that
select for your video AND audio source test.vdr and finally
hit start.

I hope this is the solution for your problem, it worked for me so you never know

Cheers.

[drewid]

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On 2001-08-10 03:07:29, herzet wrote:
I had the same problem with a 2cd divx, in the beginning it was perfect in sync and after 6 min it went out of sync I've been busy with it for 3 days now and I found a solution, hope this will work for you also.

first open the divx in vdub]
the hit ctrl-r there wil popup a box called video frame rate control, then select: Change so video and audio durations match, then ok.

Then run auxsetup.exe (located in your vdub dir), select install handler and then ok
goto file -> start frame server click start and select a filename like test.vdr and save it.This wil porvide you with a box called: Frameserver mode - VirtualDub, check
at the bottom of the box if you have: Frameclients installed: AVIFile only, if so
then start TMPenc load your svcd or vcd template after that
select for your video AND audio source test.vdr and finally
hit start.

I hope this is the solution for your problem, it worked for me so you never know

Cheers.

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when doing this do you need to rip the audio stream
sperately or just use the divx audio stream if it is in sync?

<font size=-1>[ This Message was edited by: drewid on 2001-08-12 20:53:03 ]</font>

[Dev]

Some computers do this I think just because thats the way they are, no amount of cajoling will help them. Mine included. So i fix the problem by converting my movies in 20-30 minute blocks, then you dont notice the lip sync probs because by the time it gets noticable, it switches back to in sync again

Use the 'source range' command to do this. Its primitive, but if you can't get it to work any otehr way, your stuck with it. You could probably rejoin all the mpegs at the end if you want, or just have a VCD with chapters.

[wildcatfan]

I had this problem doing blade runner. Finally I had to load the file into vdub then use it to downsample the audio to 44.1Khz then encode the audio or else totally out of sync. Try loading it into vdub and saving a new wav file (using full processing mode) and then encode and see if it helps..

Michael

[arminio]

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On 2001-08-13 00:34:14, wildcatfan wrote:
I had this problem doing blade runner. Finally I had to load the file into vdub then use it to downsample the audio to 44.1Khz then encode the audio or else totally out of sync. Try loading it into vdub and saving a new wav file (using full processing mode) and then encode and see if it helps..
Michael
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Thanx but that's the way I did it in the first place (BTW; audio was in 44.1 so no need to resample). Full extracted WAV was 500 MB and used as external audio during encoding but without success. Mabye this problem really is due to PC ?

[herzet]

I use the divx audio stream drewid

[wildcatfan]

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On 2001-08-13 01:49:40, arminio wrote:
Thanx but that's the way I did it in the first place (BTW; audio was in 44.1 so no need to resample). Full extracted WAV was 500 MB and used as external audio during encoding but without success. Mabye this problem really is due to PC ?
</BLOCKQUOTE></FONT></TD></TR><TR><TD><HR size=1 color=black></TD></TR></TABLE>

Correct I saw that, but using VDub in full processing mode makes it resample the file anyways instead of just direct copying, just thought it might help.

Michael