On Sun, 24 Apr 2005, Jean Carlos wrote:
> clients request to translate an a avi file to dvd) so i tried to make a
> dvd format compilant but the audio is not synced, and i dont know what
> im doing wrong, here is the method im using
I do have an idea what the problem _may_ be but I think we need a
little more information in addition to the proceedure you are using.
What type of avi file is it? By that I mean is it anime, a DVD
rip that someone made (and if so how did they make it - did they
do a 3;2 pulldown, etc).
> -----------------------------------------------------------------------
> for video:
> mkfifo stream.yuv
>
> cat stream.yuv | yuvdenoise | yuvscaler -M WIDE2STD -O DVD -n n |
> mpeg2enc -a 2 -n n -F 4 -s -f 8 -o video.m1v&
I see you are _forcing_ the output frame rate to 30000/1001 (NTSC VIDEO)
with "-F 4". Is the input movie REALLY at that rate? IF the input
video is already ~29.97... then you do not need -F 4. If HOWEVER
the input is really at ~23.976 ("-F 1" or "converted film") then
"-F 4" is the WRONG thing to do and that is why your video is playing
too quickly!
From the looks of it the source video is 16:9 (widescreen) - is there
a reason you're converting 'wide to standard' with 'WIDE2STD' rather
than creating a 16:9 DVD flle?
> mixing both:
> mplex -o dvd.mpg sound.mp2 video.m1v
> -----------------------------------------------------------------------
>
> it seems that somewhere its frame dropping cuz the video goes faster
> than the audio track
Actually I think the video is going faster because the input was
at "converted film" speed (24000/1001) frames/sec but you told
the encoder to set "NTSC VIDEO" (30000/1001).
What does MPlayer say about the file when you play it? There will
be a line something like this when MPlayer first starts playing:
VIDEO: MPEG2 720x480 (aspect 2) 29.970 fps 7500.0 kbps (937.5 kbyte/s)
If you see something like 23.97... then you shouldn't use "-F 4"
when encoding. You should replace send to mpeg2enc the 24000/1001
stream and then use "-p" to tell mpeg2enc to do a 2:3 pulldown.
The other item of interest would be the output of this command:
cat stream.yuv | head -n 1
Basically temporarily replace the denoising, scaling and encoding
with "head -n 1" so we can see what the YUV4MPEG2 header produced by
MPlayer looks like.
Cheers,
Steven Schultz
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