Pal to NTSC Problems with framerate conversion

[tans66]

I am using virtualdub to extract wav,load into Besweet,using preset 25->23.976 fps letting it transcode.But when I use it as audio input or to mux it later the audio is way out of sync(way ahead of video),like besweet did not convert,I have used Besweet several times for this successfully and I am pulling my hair out why it is letting me down now.Is there a program where I can check the audio framerate ? gspot & avicodec can't.
Thx for any feedback

[bugster]

Audio does not have a framerate like video, however, you can check the length and compare it to the original.
Going from 25 -> 23.976 it should get about 4% slowre/longer.

[FulciLives]

Hello

Did you consider that perhaps BeSweet is working correctly but that maybe you didn't convert the video correctly and hence the sync problems?

If BeSweet correctly did the PAL (25fps) to NTSC (23.976fps) conversion then the new NTSC created audio file will be approximately 4% longer than the original PAL audio source. So it is easy to open each up in any media player and compare the overall running time of the audio clips.

Also please note that the current STABLE VERSIONS of BeSweet and the BeSweet GUI do not properly do the framerate audio conversion ... you should be using the latest BETA versions of each. Also I have had success with frame rate changes going from AC-3 to AC-3 as well as AC-3 to WAV but I can't seem to get it to go from AC-3 to MP2 while doing the frame rate change. So if you need MP2 I would use BeSweet to go from AC-3 to WAV and then convert the WAV to MP2 (such as feeding it through TMPGEnc while converting the video).

Of course this is assuming you have an AC-3 source to begin with (all PAL to NTSC conversion I have done started with a PAL DVD source).

- John "FulciLives" Coleman

*** EDIT ***
OK I just read your post again and see you have a WAV for a source file. I would try doing the frame rate change going from WAV to WAV and then again going from WAV to MP2 (assuming you want MP2 in the end) and see which works better. I have a funny feeling that you will get better results going from the original WAV to a new WAV and then just feed the "corrected" WAV into TMPGEnc when encoding the video to get your MP2 sound.

[FulciLives]

Hello Again

As far as converting the video from PAL to NTSC you might want to take a look at the following thread:

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

Make sure you check out the WEBSITE LINK I make mention of early in the thread.

- John "FulciLives" Coleman

[tans66]

Hey thx all for reply.
Time of wav is 4% longer so besweet doing its job.Gonna play with ac3->wav,wav to mp2 see if that helps.Thx 4 threads going have to do some reading thx to Fulcilives.

[FulciLives]

Hey thx all for reply.
Time of wav is 4% longer so besweet doing its job.Gonna play with ac3->wav,wav to mp2 see if that helps.Thx 4 threads going have to do some reading thx to Fulcilives.

Just feed the corrected (frame rate changed) WAV into TMPGEnc when encoding the video. This way you can do a CBR recording and after a couple of minutes stop it to insure that you have everything set up ... if you audio is in synch then you know everything is going well ... restart using CBR or VBR or whatever. If it is out-of-synch then you know without having to do the whole video and the muxing the audio blah blah blah.

If you aren't used to converting PAL to NTSC with TMPGEnc then you might not get the correct settings right off the bat.

- John "FulciLives" Coleman