On Tue, 15 Jun 2004 [EMAIL PROTECTED] wrote:
> come for me to burn it to DVD. I rendered my film to AVI/DV and
> then use lav2yuv to pipe it to mpeg2enc and mp2enc. Following that,
> I use mplex to create DVDauthor compatible output and there
> I run into my problem. Everything is 29.97 fps throughout, but
> after mplex I'm left with 23.976 fps. Here's what I think
> will be helpful. Any thoughts on the matter would be greatly
> appreciated. I'd prefer 29.97 (30) fps output for my final product.
I think the output is just fine...
> lav2yuv c0.avi01 | \
> mpeg2enc -I 0 -f 8 -q 5 -F 4 -V 230 -b 7500 -r 32 -2 1 -4 1 -H -n n -P -o
> c0.avi01.m2v
-F 4 is redundant if the input is already at ~30 fps. -P only
has effect if you're generating B frames and the default is -R 0
(no B frames). -f 8 implies "-V 230" and the video norm can be
inferred from the 720x480 frame size so -n n isn't needed.
What does the initial output of mpeg2enc say? Does it see the
input rate as 29.97? If not then that's where a problem might creep
in as the encoder is told to override the input stream rate.
When I have used "-r 32" or "-r 16" with mpeg2enc I have seen
artifacting (in some cases quite severe). If you're going to do that
I would suggest either adding "-R 2" or "--no-dualprime-mpeg2" to
the options (the latter will retain the bitrate savings of not
using B frames).
> [root]# mplex -f 8 -o c0.avi01.mpg c0.avi01.m2a c0.avi01.m2v
> INFO: [mplex] Scanning for header info: Video stream e0 (c0.avi01.m2v)
> INFO: [mplex] VIDEO STREAM: e0
> INFO: [mplex] Frame width : 720
> INFO: [mplex] Frame height : 480
> INFO: [mplex] Aspect ratio : 4:3 display
> INFO: [mplex] Picture rate : 29.970 frames/sec
> INFO: [mplex] Bit rate : 7500000 bits/sec
> INFO: [mplex] Vbv buffer size : 229376 bytes
30000/1001 is what mplex saw, so that's right.
> [root]# tcprobe -i c0.avi01.mpg
>
> [tcprobe] MPEG program stream (PS)
> [tcprobe] summary for c0.avi01.mpg, (*) = not default, 0 = not detected
> import frame size: -g 720x480 [720x576] (*)
> aspect ratio: 4:3 (*)
> frame rate: -f 23.976 [25.000] frc=1 (*)
> PTS=0.1780, frame_time=41 ms, bitrate=7500 kbps
I think tcprobe is dazed/confused ;) Have you tried something like
'mplayer' or 'xine' on the resulting file? I know mplayer will
print out a lot of info about a file when it starts up - that info
might be useful.
I've made quite a few DVDs and haven't seen mplex set the wrong frame
rate so it's quite a mystery where the 23.976 is coming from.
Cheers,
Steven Schultz
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