FPS

[Sakuya]

I have this AVI that has 23.976fps. What would happen if I converted to MPEG with 29.76fps? I mainly use the latter one so what would happen if I converted it using the same 23.976?

[ZippyP.]

If you keep it at the lower FPS then you get 20% more bitrate per frame and therefore better quality.

[Sakuya]

Will the audio get choppy playback? In this case, I have a VBR audio track. So I will be using VDub to extract the audio as a WAV and then go to TMPGEnc to select the video and audio source separately.

Last time I converted a 23.976 to the same frame rate and played on my TV, the audio was jerky. It had normal audio too. Why is that?

[jeex]

actually when it comes to mpeg decreasing the frame rate from 30 to 24 does not affect output size/quality, or vise versa.

[Sakuya]

But will it have the choppy audio? That's my main priority.

[ZippyP.]

FPS should not affect the audio, I recommend Goldwave for extracting VBR audio to wav.

[ZippyP.]

decreasing the frame rate from 30 to 24 does not affect output size/quality

I agree that it does not affect the size but it will give more bits per frame. I refer you to this post, third one down, from someone who knows more than I.

[Sakuya]

Thanks. I'll do a test convert to 23.976fps and see if it has jerky audio. If it does or if I have any future problems, I'll come back to this thread. Thanks again!

[Sakuya]

Ok, while converting in TMPGEnc, in the small window there, it was converting fine with pictures in the window but when I looked at it an hour later, all it has was a black screen (with slight macroblocking). I'm wondering if there is any problems? I ran it through in VDub and it doesn't seem to be corrupted and it plays fine. What's the problem? It's been black for over 1 minute since I looked at it..

Oh great, TMPGEnc closed automatically. What's the problem? Maybe I should convert it to 29.97fps for simplicity's sake?

Also, I did a test run and used Source Range to convert the middle portion and it played fine. But, the panning scenes were a bit...."eye-dazzling". Is there a way to make it smoother?

[Sakuya]

I've found more information about the source AVI file. It's encoded in Xvid. I installed an Xvid codec. I finally got the file to open in Virtual Dub. And right when it is opened, a black screen comes on with very large pixelly white letters saying:

Warning: Nothing to output
bframe decoder lag

What does that mean? When I extracted the WAV and listened to it, normally, there could be a slight pause before the opening theme song right? But it jumped right into the beginning of the song, as if some parts were cut...but I'm not sure if it was really cut or if it was an encoding problem. Anyone know how to fix so I can convert it to MPEG either at 23.976fps or 29.97fps?

[theDruid]

have you tried checking the file with gSpot (or one of the other avi codec info apps)?

does the file play okay in WMP, PowerDVD / WinDVD etc..?

cheers,
mcdruid.

[mats.hogberg]

Warning: Nothing to output
bframe decoder lag

What does that mean?

It means that the AVI is corrupt. If you have an obscene amount of spare time, start reading "How to remove bad frames" and start fixing it.

/Mats

[Sakuya]

In GSpot it said the file is complete and shows its data. It plays fine in WMP Classic without the black and white message. Will removing the bad frames involve cutting some video from the AVI? Won't the outcome be bad since it's missing a part of the movie?

[ZippyP.]

Will removing the bad frames involve cutting some video from the AVI? Won't the outcome be bad since it's missing a part of the movie?

I guess it all depends on how much of the film you lose. It may be
terrible or you might not even notice.

[mats.hogberg]

In GSpot it said the file is complete and shows its data. It plays fine in WMP Classic without the black and white message.

This does however not tell us much regarding the integrity of the AVI. Players are very tolerant, just skipping parts that can't be read, and GSpot mostly checks some header info.

Will removing the bad frames involve cutting some video from the AVI? Won't the outcome be bad since it's missing a part of the movie?

Depends on how much if the frames that are f*cked. Might be just one or two, and a missing 1/25 sec here and there wont be noticed. Could also be so bad that you have to cut out noticable amounts - Then, of corse, I'd scrap the project alltogether, or recreate the AVI from the source, if it's available.

/Mats

[Sakuya]

Even though in VDub, it has the black and white message, VDub MP3 found no bad frames! So I went to TMPGEnc to try to convert just the opening credits to MPEG at the same frame rate: 23.976.

After it's done, I viewed it on my computer using WMP Classic. It played fine. So I burned it to CD-RW to see how it would play on the DVD player (good thing it supports CD-RW ). As I suspected, the audio gets choppy just like last time I did a 23.976fps conversion! Why is this? It wasn't like that on the computer.

So should I convert the AVI file to 29.97fps this time even though it will lose some quality? What kind of quality will it lose? Will it still have choppy audio?