Hi! I have a DV stream that I'm trying to encode for DVD. I have an NTSC
DV camera, and it shoots in 30000/1001. I can encode it perfectly well
into 30000:1001 MPEG-2.
As an experiment, I wanted to make a 24000/1001 encoding (I didn't
really care about the output quality, I just was curious). When I
encode, I use mplayer to pipe the video's yuv stream to a named fifo
(stream.yuv). While that is going on the background, I cat the fifo
through yuv2fps and then to mpeg2enc.
After reading mpeg2enc's man page, I decided that changing -F 4 to -F 1
and adding -p would work. However, I was wrong and mpeg2enc changed the
frame rate number to 4 (30000/1001) when it started. The man page gave
me the impression that -p would work for 24fps _source_ material and
tell the decoder to do pulldown at playtime. yuv2fps changed the
framerate to 24000/1001, but mpeg2enc still encoded at 30000/1001.
By removing -p, I got things to work and mpeg2enc kept the source's
24000:1001 frame rate. What am I not understanding about using -p?
Thanks,
Joe
====================================
From mpeg2enc's man page:
-F|--frame-rate num
Set the frame-rate of the output-stream. By default, this
value is
inferred from the input header. Currently only the standard
MPEG rates
are supported. Eventually more-or-less arbitrary rates will be
possible.
0 - illegal
1 - 24000.0/1001.0 (NTSC 3:2 pulldown converted FILM)
2 - 24.0 (NATIVE FILM)
3 - 25.0 (PAL/SECAM VIDEO / converted FILM)
4 - 30000.0/1001.0 (NTSC VIDEO)
5 - 30.0
6 - 50.0 (PAL FIELD RATE)
7 - 60000.0/1001.0 (NTSC FIELD RATE)
8 - 60.0
-p|--3-2-pulldown
Setting -p only makes sense for 24frame/sec Movie source
material. It
sets flags in the output stream that tell the decoder to play
the movie
as NTSC 60field/sec video using "3:2 pulldown". This is
vastly more
efficient than encoding as 60field/sec video. The classic
application is
to transcode a PAL-encoded movie (24fps played too fast at 25
fps!) into
NTSC (see the -f flag).
====================================
Doesn't work:
cat stream.yuv | yuvfps -r 24000:1001 -v 1 | nice -n 0 mpeg2enc -S 4500
-B 304 -a 2 -f 8 -b 7840 -g 4 -G 9 -D 10 -F 1 -p -v 1 -n n -4 2 -2 1 -q
5 -H -o "ntscfilm-test.m2v"
result:
INFO: [yuvfps] yuv2fps (version 0.1) is a general frame resampling
utility for yuv streams
INFO: [yuvfps] (C) 2002 Alfonso Garcia-Patino Barbolani
<[EMAIL PROTECTED]>
INFO: [yuvfps] yuvfps -h for help, or man yuvfps
++ WARN: [yuvfps] Original framerate: 29970029:1000000, Normalized
framerate: 30000:1001
++ WARN: [yuvfps] Converting from 30000:1001 to 24000:1001
INFO: [mpeg2enc] SETTING EXTENDED MMX for MOTION!
INFO: [mpeg2enc] SETTING MMX for TRANSFORM!
INFO: [mpeg2enc] SETTING EXTENDED MMX for PREDICTION!
INFO: [mpeg2enc] Selecting DVD output profile
INFO: [mpeg2enc] Progressive input - selecting progressive encoding.
++ WARN: [mpeg2enc] 3:2 movie pulldown with frame rate set to decode
rate not display rate
++ WARN: [mpeg2enc] 3:2 Setting frame rate code to display rate = 4
(29.970 fps)
INFO: [mpeg2enc] Encoding MPEG-2 video to ntscfilm-test.m2v
INFO: [mpeg2enc] Horizontal size: 720 pel
INFO: [mpeg2enc] Vertical size: 480 pel
INFO: [mpeg2enc] Aspect ratio code: 2 = 4:3 display
INFO: [mpeg2enc] Frame rate code: 4 = 30000.0/1001.0 (NTSC VIDEO)
INFO: [mpeg2enc] Bitrate: 7840 KBit/s
INFO: [mpeg2enc] Quality factor: 5 (Quantisation = 5) (1=best, 31=worst)
INFO: [mpeg2enc] Field order for input: none/progressive
INFO: [mpeg2enc] New Sequence every 4500 Mbytes
INFO: [mpeg2enc] Assuming non-video stream of 304 Kbps
INFO: [mpeg2enc] Search radius: 16
INFO: [mpeg2enc] GOP SIZE RANGE 4 TO 9
INFO: [mpeg2enc] Setting colour/gamma parameters to "NTSC"
INFO: [mpeg2enc] Progressive format frames = 1
INFO: [mpeg2enc] 3:2 Pulldown selected frame decode rate = 23.976 fps
INFO: [mpeg2enc] Setting hi-res intra Quantisation matrix
INFO: [mpeg2enc] Buffering 21 frames
====================================
Works:
cat stream.yuv | yuvfps -r 24000:1001 -v 1 | nice -n 0 mpeg2enc -S 4500
-B 304 -a 2 -f 8 -b 7840 -g 4 -G 9 -D 10 -F 1 -v 1 -n n -4 2 -2 1 -q 5
-H -o "ntscfilm-test-no-p.m2v"
result:
INFO: [yuvfps] yuv2fps (version 0.1) is a general frame resampling
utility for yuv streams
INFO: [yuvfps] (C) 2002 Alfonso Garcia-Patino Barbolani
<[EMAIL PROTECTED]>
INFO: [yuvfps] yuvfps -h for help, or man yuvfps
++ WARN: [yuvfps] Original framerate: 29970029:1000000, Normalized
framerate: 30000:1001
++ WARN: [yuvfps] Converting from 30000:1001 to 24000:1001
INFO: [mpeg2enc] SETTING EXTENDED MMX for MOTION!
INFO: [mpeg2enc] SETTING MMX for TRANSFORM!
INFO: [mpeg2enc] SETTING EXTENDED MMX for PREDICTION!
INFO: [mpeg2enc] Selecting DVD output profile
INFO: [mpeg2enc] Progressive input - selecting progressive encoding.
INFO: [mpeg2enc] Encoding MPEG-2 video to ntscfilm-test-no-p.m2v
INFO: [mpeg2enc] Horizontal size: 720 pel
INFO: [mpeg2enc] Vertical size: 480 pel
INFO: [mpeg2enc] Aspect ratio code: 2 = 4:3 display
INFO: [mpeg2enc] Frame rate code: 1 = 24000.0/1001.0 (NTSC 3:2
pulldown converted FILM)
INFO: [mpeg2enc] Bitrate: 7840 KBit/s
INFO: [mpeg2enc] Quality factor: 5 (Quantisation = 5) (1=best, 31=worst)
INFO: [mpeg2enc] Field order for input: none/progressive
INFO: [mpeg2enc] New Sequence every 4500 Mbytes
INFO: [mpeg2enc] Assuming non-video stream of 304 Kbps
INFO: [mpeg2enc] Search radius: 16
INFO: [mpeg2enc] GOP SIZE RANGE 4 TO 9
INFO: [mpeg2enc] Setting colour/gamma parameters to "NTSC"
INFO: [mpeg2enc] Progressive format frames = 1
INFO: [mpeg2enc] Setting hi-res intra Quantisation matrix
INFO: [mpeg2enc] Buffering 21 frames
-------------------------------------------------------
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