Framerate problem...

[TheDJ®]

HI,

I am trying to convert the framerate of audio from 23.976fps to 25fps. I am using besweet to do this, and not having any success, i have used this same method before and it has worked.

I have converted the video to 25fps, but when i convert the audio to 25fps, the length does not match the video, so this will obviously cause audio sync probs.

I have tried extracting the audio as an mp3 & wav, i get same results both ways. The original audio has been encoded with mp3.

In bewsweet i choose NTSC (23.976) > PAL (25), select mp2, i dont select downconvert sample rate coz the audio is already 48Khz, Hip is checked (MPA Decoder), in SSRC output rate is set to 48Khz and in 2Lame Input sample rate is 48Khz, output options stereo, 192kbps

Any idea's plz peeps?

Thx

TheDJ®

[mats.hogberg]

Yes:
Extract audio track with VirtualDub, direct stream copy, save wav.
Rename xyz.wav to xyz.mp3
Convert to wav with good mp3 to wav decoder (CDEx?)
Squeeze wav to 25 fps duration with WavWorks. Encode with 25 fps AVI as video source, squeezed WAV as audio source.

/Mats
(This ought to work, provided you just changed the frame rate in the AVI after extracting wav with AVIFrate (or similar method).)

[TheDJ®]

Hi Mats, thx for the reply.

I have downloaded both those programs, i encoded the mp3 to wav with Cdex.

But, When i downloaded WavWorks, there was no setup file? all i got was CLASS files? how are we meant to use this program?

Also, i forgot to mention that i am doing a DVD here, not AVI framerate conversion. I have already successfully converted the video only to DVD 25 fps, and now i just need to match the audio.

[FulciLives]

Get your sound into a normal WAV file. Then do the frame rate conversion using BeSweet going from WAV to WAV. Then convert the new PAL 25fps WAV to MP2 (since I guess that is your target final format).

BeSweet has trouble doing the frame rate thing with MP2. So you have to do it with WAV to WAV then convert to MP2.

- John "FulciLives" Coleman

P.S.
Please be sure to use the latest BETA versions of BeSweet and the BeSweet GUI.

[mats.hogberg]

OK, but I take it you just sped up the playing (from 23.976 to 25 fps) of the mpg a bit?
Yes, WavWorks is a Java app, but don't be fooled - it does its job faster than any other app I've tried.
If your system is Java enabled, you should be able to just double-click the .class file like an exe or anything, and Java (U need Sun's version - MS crippled old version won't do) will kick in and launch the app.

/Mats

[TheDJ®]

@FulciLives.....would u recommend direct stream copy of full processing? coz when i open file in VD it mentions improper VBR, and will cause sync problems.

With Nandub, i didnt get the error, but it wont let me do full processing with the audio, only direct stream.

Nevertheless, I've tried extracting the wav using VD @ fullprocessing mode (uncompressed), i put into Besweet, did wav to wav with 23.976 > 25fps, and it isnt changing the frame rate, the length of the audio is less than original and doesnt match the length of encoded video (25fps), as you can see below;

Source Video Length (23.976fps): 2 hours 58 mins

Target Video (25 fps): 3 hours 34 mins
Target Audio (25fps): 2 hours 51 mins.

I dont know why the target audio is coming out less, should match Target Video!

[FulciLives]

@FulciLives.....would u recommend direct stream copy of full processing? coz when i open file in VD it mentions improper VBR, and will cause sync problems.

With Nandub, i didnt get the error, but it wont let me do full processing with the audio, only direct stream.

Well I'm no expert with these "difficult" DivX/Xvid files but I was reading some stuff about this recently and from what I read it seems like the best method (which I've yet to test) would be to use VirtualDubMod and select DEMUX AUDIO and save it in the format that it is in (be it MP3 or AC-3 etc.)

This is from the HELP file that comes with VirtualDubMod:

Can I save the audio streams to files without WAV headers ?
Yes, just use Demux audio instead of Save WAV. If the stream type is said to be AC3 or MP3, the correspondant extension will be proposed when saving the file.

Once you get your MP3 try to use BeSweet to convert it to a WAV file.
Then convert that WAV to a new WAV doing the NTSC--->PAL framerate change. Then convert that final WAV into whatever your final format will be (which I think you said was MP2).

- John "FulciLives" Coleman

[TheDJ®]

Thx for the reply.

Getting same error message with VD-Mod, improper VBR....this will cause audio sync.

I'm still trying.....i wont give up!

[FulciLives]

Source Video Length (23.976fps): 2 hours 58 mins

Target Video (25 fps): 3 hours 34 mins
Target Audio (25fps): 2 hours 51 mins.

I dont know why the target audio is coming out less, should be more!

OK at first I guess I didn't read your entire post. Now that I have I'm confused!

If the original is 2 hours and 58 mins that is the same as saying 178 minutes. It is easier to work in total minutes when figuring out these frame rate changes. So if the video is 178 minutes at 23.976fps then when converted to 25fps it should have a running time of approximately 186 mintues or 3 hours 6 mins.

So where are you getting 3 hours 34 mins (214 minutes)?!?!?

That doesn't add up!

Also you say the original audio went from 2 hours 58 mins (or 178 minutes) to 2 hours 51 mins (or 171 minutes). That is only possible if you selected PAL 25fps ---> NTSC 23.976fps but you actually want to do NTSC 23.976fps ---> pal 25fps

So I think you just selected the wrong option there in BeSweet.

Also I just realized that 3 hours 34 mins (214 minutes) is the conversion from 29.970fps NTSC to 25fps PAL whereas you should be doing 23.976fps NTSC to 25fps PAL for a total final running time in PAL of 186 minutes (or 3 hours and 6 mins).

So if your video is really 214 minutes long you converted it incorrectly.

- John "FulciLives" Coleman

[TheDJ®]

...

[TheDJ®]

@FulciLives,

Thanks for doing all the calculations. I'm sure i converted the video at 23.976, but looks like i will have to do it again.

But i am still puzzled to why my audio isnt converting to 25fps.

I've done around 7 tests so far, doing direct stream/full processing mode, using VD & ND, and it still comes out to 171mins (2 hours 51 mins).

I used the preset in the latest version of Besweet (23.976 --> 25), but i noticed that you can add the fps manually under OTA options, so i also tried that. no joy! It wont convert to 25fps.

[TheDJ®]

[FulciLives]

Use the PRESET audio framerate option as opposed to the one in your picture.

Do NOT check mark the Downconvert Sample Rate.

I usually don't use Hybrid Gain so since you have that enabled that might be another cause for it not working correctly but I'm not sure.

Remember that when doing the framerate change certain settings that would otherwise work correctly can't be used. That's just the way it is.

Also ... there is a way to convert NTSC to PAL in such a way that the newly created PAL video will have the same running time as the original NTSC but will work properly on a 25fps PAL display. So if you can't get the audio to work you can convert from NTSC to PAL using this other method and it will match the original running time of the audio so that you don't have to do the frame rate change on the audio.

This method I'm speaking off is a bit tricky a requires using an AviSynth AVS script. I know lot of people don't like using AviSynth but really it's not all THAT difficult.

If you want I could post the AviSynth AVS script you would use if you tihnk you want to try it.

- John "FulciLives" Coleman

P.S.
Try the audio one more time and if for some reason it still does not work then post the logfile here that BeSweet creates. It's just a simple TXT file so you can just copy and paste it here.