TMPEGENC Audio Out of Sync!

[shin_zer]

I have encoded nearly +60 Movies in Tmpegenc and this is the first time it happens this to me. THe audio at first seems fine but later it is almost 5 secs faster.

I think is because of the AVI fps, that is 25, and the VCD is Ntsc 29,97 if i am not wrong. I used "Audio Edit" and 400% of volume. Is this the true problem?

What can i do! Anything instead Converting to PAL!

[FulciLives]

I have encoded nearly +60 Movies in Tmpegenc and this is the first time it happens this to me. THe audio at first seems fine but later it is almost 5 secs faster.

I think is because of the AVI fps, that is 25, and the VCD is Ntsc 29,97 if i am not wrong. I used "Audio Edit" and 400% of volume. Is this the true problem?

What can i do! Anything instead Converting to PAL!

You need to read some of the threads on here about converting PAL to NTSC. Bascially if your PAL AVI is PROGRESSIVE then the best method is to encode it at 23.976fps and you must check the "DO NOT FRAME RATE CONVERSION" setting in TMPGEnc. Then you need to process the audio seperately using BeSweet which can convert the original audio from 25fps to 23.976fps otherwise you will have synch problems.

- John "FulciLives" Coleman

[roach76]

That is exactly the problem. Try using the AWESOME tool BeSweet, a freeware program that allows you to change your audio framerate to match your videos. Also when you set your volume to 400%, are you normalizing it? You shouldn't set it to anything above 100% unless you normalize, because you can clip the audio's wave and distort the sound.

Also I personally would never select the 'DO NOT FRAME RATE CONVERSION' this would cause your video to stay at 25fps. Then FulciLives says to convert the audio's frame rate to 23.976. As you can see 25 and 23.976 = audio sync problems. You could untick that option then use BeSweet to fix the audio then both would be at 23.976 (if the video is progressive like FulciLives said).

I would and I know you said you didn't want to, if your player can, leave it at PAL. 99% of all new players play PAL and NTSC, and then you won't have these problems.

[FulciLives]

Also I personally would never select the 'DO NOT FRAME RATE CONVERSION' this would cause your video to stay at 25fps. Then FulciLives says to convert the audio's frame rate to 23.976. As you can see 25 and 23.976 = audio sync problems. You could untick that option then use BeSweet to fix the audio then both would be at 23.976 (if the video is progressive like FulciLives said).

I'm sorry but this comment is not correct in regard to DO NOT FRAME RATE CONVERSION. When you input a 25fps PAL source BUT you select a NTSC template you MUST check mark DO NOT FRAME RATE CONVERSION and encode as 23.976fps PROGRESSIVE with 3:2 pulldown. The frame rate will be 23.976fps but it merely slows things down from 25fps to 23.976fps. If you do not check mark DO NOT FRAME RATE CONVERSION then you will still have a 23.976fps NTSC video but TMPGEnc will actually drop frames to achieve this which results in choppy playback.

- John "FulciLives" Coleman

P.S.
For more info on doing PAL to NTSC conversions please see the following two links:

http://www.geocities.com/xesdeeni2001/StandardsConversion/

https://www.videohelp.com/forum/viewtopic.php?t=160433&highlight=

Good Luck

- John "FulciLives" Coleman

*** EDIT ***
Please note that everything I have said is more or less assuming a PROGRESSIVE PAL source. If you have an interlaced PAL source then there is another way to do the conversion that works better ... see the links above for more details.

[roach76]

You could be right, but I was going off TMPGEnc's Help File that came with the program.....

'Do not convert frame rate'

Enable this to disable frame rate conversion. This is normally a bad thing because it will cause a film's audio and video to become out of sync if the source frame rate different from the selected output frame rate.

Normally, this is not enabled.

[FulciLives]

You could be right, but I was going off TMPGEnc's Help File that came with the program.....

'Do not convert frame rate'

Enable this to disable frame rate conversion. This is normally a bad thing because it will cause a film's audio and video to become out of sync if the source frame rate different from the selected output frame rate.

Normally, this is not enabled.

Read that again carefully. That is NOT what you want to do when doing PAL (25fps) to NTSC (23.976fps) conversions.

Let me explain ... FILM is 24fps so PROGRESSIVE NTSC is about the same (23.976fps) but PAL is 25fps so the film source (24fps) is simply "sped" upto 25fps for PAL so to convert it back to FILM/NTSC you have to slow it down to 23.976fps and this is what happens in TMPGEnc when you check the DO NOT FRAME RATE CONVERSION option. If you don't check that option then TMPGEnc will drop and/or blend frames to achieve the 23.976fps frame rate RATHER THAN just slowing it down from 25fps to 23.976fps

The way TMPGEnc does it the original PAL audio will match the new NTSC video but you get choppy video playback. The method I described gives you a properly converted PAL to NTSC video but you must then slow down the audio (with BeSweet) since the NTSC is now LONGER than the original PAL since we simply changed the frame rate from 25fps to 23.976fps

Hopefully that makes more sense now

- John "FulciLives" Coleman

[roach76]

I think I understand what you're saying...

If I don't select that option, then say TMPGEnc will skip say the 25th frame every second and leave that out of the final video. You'll have a 24fps (23.976) video but it will still run for the same time and there will be audio problems because when multiplexed it becomes choppy because it's a different frame rate. But this option can't be selected because BeSweet doesn't drop frames in the audio, it slows it down. Then you'll have sync problems.

If I do select that option, then the first second of the video will have the first 24fps, then the 25th frame will be the first frame in the next second and this will continue throughout the video stream, but the movie will now run slightly (4%) longer than previously but the video's length now runs for the correct time as originally intended. This method then matches BeSweet's method and then everything is in sync and running for the correct length.

Is this right?

[FulciLives]

I think I understand what you're saying...

If I don't select that option, then say TMPGEnc will skip say the 25th frame every second and leave that out of the final video. You'll have a 24fps (23.976) video but it will still run for the same time and there will be audio problems because when multiplexed it becomes choppy because it's a different frame rate. But this option can't be selected because BeSweet doesn't drop frames in the audio, it slows it down. Then you'll have sync problems.

If I do select that option, then the first second of the video will have the first 24fps, then the 25th frame will be the first frame in the next second and this will continue throughout the video stream, but the movie will now run slightly (4%) longer than previously but the video's length now runs for the correct time as originally intended. This method then matches BeSweet's method and then everything is in sync and running for the correct length.

Is this right?

BINGO !!!

You got it

- John "FulciLives" Coleman

[roach76]

Woohoo. Thanks for explaining that, and yet through the forums I learn another thing!