Hi,
I'm trying to convert a video with transcode [1] plus mplayer [2], but have
some problems.
Basically, I refer to the wiki,
transcode -H0 \ <- tells transcode not to probe
-i your_movie_file \
-x mplayer,mplayer \
-f 23.976,1 \ <- framerate of input video stream
-g 640x352 \ <- geometry of input video
-n 0x1 \ <- mplayer will feed transcode raw pcm
-e 44100,16,2 \ <- samplerate, bit-depth, and channels in source
audio
-y ffmpeg \ <- use lavc for encoding
--export_prof dvd-pal \
--import_asr 3 \ <- always set the import aspect ratio to be equal
to the export asr that you are going to target!
--export_asr 3 \
-D0 \
-N 0x2000 \
-b 384 \
-m new_movie_name.ac3 \
-o new_movie_name
and provided/substitute all the above parameters to transcode using my own
video values, from the 'mplayer -identify' output:
-H0 -f 24.000,2 -g 608x256 -n 0x1 -e 44100,16,2 --import_asr 2 -D0
The whole transcode command and process log is at [3].
My first question is about transcode scaling. I used to use
'--export_prof dvd -Z 704x480,fast --export_asr 2' to let transcode figure
out how to zoom automatically. But it does not work with mplayer -- the
whole video zoomed to 704x480 without and top/bottom black-band, the aspect
ratio is lost. The result is the same whether I specify the
'--import_asr 2' parameter or not.
transcode v1.0.2 (C) 2001-2003 Thomas Oestreich, 2003-2004 T. Bitterberg
[transcode] V: AV demux/sync | (4) initial PTS / enforce frame rate
[transcode] V: import frame | 608x256 2.38:1 encoded @ 4:3
XXX: zoom=yes pre_clip=no
[transcode] V: fast resize | Using -B 0,0,8 -X 28,12,8
[transcode] V: new aspect ratio | 704x480 1.47:1 (-X)
How should I inform transcode to do proper scaling in this case?
The biggest problem is A/V sync. I have to confess I always have A/V sync
problem with transcode + mplayer before. Now that I think I know transcode
well enough, I want to give it a try yet another time.
As you can see, I've applied every parameter that I could think of:
-n 0x1 -e 44100,16,2 -N 0x2000 -E 48000,16,2 -b 224 -J resample
yet, I still have A/V sync problem: at 0:2:0 spot, the audio is already
lagged 7~8 seconds, and the problem get worse and worse.
I really appreciate someone can help me out.
thanks a lot
[1]Package: transcode
Version: 2:1.0.2-0.11
Versions of packages transcode depends on:
ii libavcodeccvs51 3:20060814-0.3 library to encode decode multimedi
ii libavutilcvs49 3:20060814-0.3 avutil shared libraries
[2]Package: mplayer
Version: 1:1.0-rc1-0.0
Package: ffmpeg
Version: 3:20060814-0.3
Versions of packages ffmpeg depends on:
ii libavcodeccvs51 3:20060814-0.3 library to encode decode multimedi
ii libavutilcvs49 3:20060814-0.3 avutil shared libraries
[3]transcode command and process log
transcode -i "test.wmv" --ext none,none -x mplayer,mplayer --export_prof dvd
-Z 704x480,fast --export_asr 2 -M 4 -s 2 -H0 -f 24.000,2 -g 608x256 -n 0x1
-e 44100,16,2 --import_asr 2 -D0 -o "test-.m2v" -m "test-.mpa"
--video_max_bitrate 3600 -y ffmpeg -F mpeg2video -N 0x2000 -E 48000,16,2
-b 224 -J resample
transcode v1.0.2 (C) 2001-2003 Thomas Oestreich, 2003-2004 T. Bitterberg
[transcode] V: AV demux/sync | (4) initial PTS / enforce frame rate
[transcode] V: import frame | 608x256 2.38:1 encoded @ 4:3
XXX: zoom=yes pre_clip=no
[transcode] V: fast resize | Using -B 0,0,8 -X 28,12,8
[transcode] V: new aspect ratio | 704x480 1.47:1 (-X)
[transcode] V: bits/pixel | 0.222
[transcode] V: decoding fps,frc | 24.000,2
[transcode] V: Y'CbCr | YV12/I420
[transcode] A: import format | 0x1 PCM [44100,16,2]
[transcode] A: export format | 0x2000 AC3 [48000,16,2] 224 kbps
[transcode] V: encoding fps,frc | 24.000,2
[transcode] A: bytes per frame | 7352 (7350.000000)
[transcode] A: adjustment | [EMAIL PROTECTED]
[transcode] A: rescale stream | 2.000
[transcode] V: IA32/AMD64 accel | sse2 (sse2 sse 3dnowext 3dnow mmxext mmx asm
C)
tc_memcpy: using sse for memcpy
[transcode] V: video buffer | 10 @ 704x480
[import_mplayer.so] v0.0.5 (2003-03-10) (video) rendered by mplayer | (audio)
rendered by mplayer
[filter_resample.so] v0.1.4 (2003-08-22) audio resampling filter plugin
[filter_resample.so] options=(null)
[export_ffmpeg.so] v0.3.13 (2004-08-03) (video) Lavc51.11.0 | (audio)
MPEG/AC3/PCM
[import_mplayer.so] mplayer -hardframedrop -vo null -ao pcm:nowaveheader -ao
pcm:file="/tmp/mplayer2transcode-audio.EH6Wyf" "test.wmv" > /dev/null 2>&1
[import_mplayer.so] mplayer -benchmark -noframedrop -nosound -vo yuv4mpeg
"test.wmv" -osdlevel 0 > /dev/null 2>&1
[import_mplayer.so] tcextract -i ./stream.yuv -x yv12 -t yuv4mpeg
[export_ffmpeg.so] Using FFMPEG codec 'mpeg2video' (FourCC 'mpg2', MPEG2
compliant video).
[export_ffmpeg.so]: INFO: Selected dvd profile, general video type for video
[export_ffmpeg.so]: WARNING: Interlacing parameters unknown, select video type
with profile
[export_ffmpeg.so]: INFO: Set interlacing to unknown
[export_ffmpeg.so]: INFO: Set frame rate to unknown
[export_ffmpeg.so]: INFO: Set video bitrate to 5000
[export_ffmpeg.so]: INFO: Set GOP size to 15
tc_memcpy: using sse for memcpy
[export_ffmpeg.so] Reading configuration from '/home/tong/.transcode/ffmpeg.cfg'
[export_ffmpeg.so] Reading config section 'mpeg2video' from
'/home/tong/.transcode/ffmpeg.cfg'
[export_ffmpeg.so] Option 'lmax' has a value that is too high (10000.000000 >
255.000000).
[export_ffmpeg.so] Option 'ibias' has a value that is too high (999999 > 512).
[export_ffmpeg.so] Option 'pbias' has a value that is too high (999999 > 512).
[export_ffmpeg.so]: INFO: Starting 1 thread(s)
[export_ffmpeg.so]: INFO: Display aspect ratio calculated as 1.333333
[export_ffmpeg.so]: INFO: Sample aspect ratio calculated as 0.909091
[mpeg2video @ 0xb556bee8]removing common factors from framerate
[export_ffmpeg.so]: INFO: Selected dvd profile for audio
[export_ffmpeg.so]: INFO: Resampling filter already active
[export_ffmpeg.so]: INFO: No audio resampling necessary
[mpeg2video @ 0xb556bee8]rc buffer underflow
thanks
--
Tong (remove underscore(s) to reply)
http://xpt.sourceforge.net/
