On Sun, 2005-04-24 at 09:43 -0700, Steven M. Schultz wrote:
> 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?
>
the reason why i'm converting to letter box its because i don't know if
using mpeg2enc with -n n -F 4 -a 3 will give me a 16:9 dvd file with
support to ntsc playback, i just have to give it a shoot ;)
> > 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:
Yes u were right after checking the frame rate i realize that was in
23.97, by the way here's the output:
VIDEO: [XVID] 640x360 24bpp 23.976 fps 945.9 kbps (115.5 kbyte/s)
to reach the 30 fps seems to be i good idea to use a 3:2 pulldown,
thanks a lot i never would realize how to change the fps without having
the audio problem
>
> 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.
here's the other output:
YUV4MPEG2 W640 H360 F23975999:1000000 Ip A0:0
obviusly this is the first line of the yuv header but i dont know what
this means
>
> Cheers,
> Steven Schultz
Problably i'm asking too much but if i would like to do a pal compilant,
how i would do it from ntsc and telecine sources?
-------------------------------------------------------
SF email is sponsored by - The IT Product Guide
Read honest & candid reviews on hundreds of IT Products from real users.
Discover which products truly live up to the hype. Start reading now.
http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click
_______________________________________________
Mjpeg-users mailing list
Mjpeg-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/mjpeg-users
