x264 - audio delay?

[SirCanealot]

Hi, all.

I'm currently encoding something from miniDV to x264, blah-blah, blah, blah.

Basically, I'm wondering what I shoul do about the audio delay that x264 leaves you with when encoding via VirtualDub(mod) when using B-Frames. The problem isn't too bad if you only use one B-Frame, but it becomes quite bad at 2-3.

I figured I could delay the audio in VirtualDub, but I couldn't work out what the exact values should be (no maths skills! :D).

Or is there a better way of getting rid of the audio delay these days?

There MUST be a simple solution - I mean, lots of people use H.264.

If audio delay is the best thing to do, would someone mind telling me what values I should punch into VirtualDub per B-Frame when running at 24 and 30fps?

Thanks, all~

[ChronoCross]

remember that x264 takes more system power to decode. what are your system specs and what are you using to decode the video? What are you using for audio?

[Koti]

1000ms/23.976=41.708 delay per frame - using 3b's in x264 avi results the 1st keyframe at a 3 frame delay
41.708*3=125ms

This seems to work for me for correction of audio synch in avi with x264 bframes but could be wrong , anyone else ?

(ps) I used avimux (http://www-user.tu-chemnitz.de/~noe/Video-Zeug/AVIMux%20GUI/index-eng.html) to mux audio

[bond]

first of all you will always get a 1 frame delay in .avi when using b-frames, no matter how many b-frames in a row you use

when using b-frames as references/b-pyramid you will get always 2 frames delay in .avi, no matter how many b-frames you use

[Koti]

http://img273.echo.cx/img273/3250/avimux8yo.png (http://www.imageshack.us)

All files were with x264 w/ b-refs (except the one with 1 B frame)
Reported 1st keyframe by AVIMux seems to equal # of b's selected in encode.
This is where I got the idea of number of b's = Delay

ps: haven't muxed any audio with x264 with over 3 bframes in avi since b-refs were introduced.

(edit) Upon further thought I am thinking back to before b-refs and muxing avi. B-refs would have fixed the delay as how Bond mentioned.

(more edit) Yep I was spacin :stupid: - back to my beer :D :D
Thx :)