Re: transcode - mplex - a/v sync problem
Scrive William Brown <wbrown@accesscomm.ca>:
> Hi:
>
> Having some trouble here syncing audio/video on dvd creations...
>
> First of all, here's a list of the tools I'm using:
> AMD64 sid
> jpg-6b (manual compile/install)
> lame-3.96-1 (manual compile/install)
> mjpegtools-1.8.0 (manual compile/install)
> transcode-1.0.0 with diff 6 applied.
>
> I'm using transcode to get from .avi to audio mpeg2 and video ac3 stream
> files. Then I'm using mplex from the mjpegtools package to try to put
> them back together again. The only caveat with the install of the above
> packages, is that mjpegtools-1.8.0 detected my cpu as a "k8" and then
> gcc crapped out. I changed the return value in the cpuinfo.sh script in
> that package to return "athlon64" rather than "k8" and it compiled ok,
> oddly indicating a processor type of athlon-xp. That aside, the package
> binaries seem to run ok.
>
> So, I took a 4 minute clip from an .avi movie and tried to transcode and
> mplex it. I tried at least a dozen times with differing switches and
> changes, and I still can't get the video and audio synced. Here's how
> it looked:
>
> First, here is my transcode line:
>
> transcode -i movie.avi -y ffmpeg --export_prof dvd-ntsc --export_asr=2
> -o movie -m movie.ac3 --export_fps 29.92 -c 00:07:00-00:11:00
>
> transcode v1.0.0 (C) 2001-2003 Thomas Oestreich, 2003-2004 T. Bitterberg
> libdvdread: Encrypted DVD support unavailable.
> ************************************************
> ** **
> ** No css library available. See **
> ** /usr/share/doc/libdvdread3/README.Debian **
> ** for more information. **
> ** **
> ************************************************
> libdvdread: Can't open file VIDEO_TS.IFO.
> [transcode] (probe) suggested AV correction -D 0 (0 ms) | AV 0 ms | 0 ms
> [transcode] auto-probing source movie.avi (ok)
> [transcode] V: import format | XviD RIFF data, AVI (V=ffmpeg|A=mp3)
> [transcode] V: import frame | 600x352 1.70:1
> XXX: zoom=yes pre_clip=yes
> [transcode] V: pre clip frame | 600x468 (-58,0,-58,0)
> [transcode] V: zoom | 720x480 1.99:1 (Lanczos3)
> [transcode] V: bits/pixel | 0.217
> [transcode] V: decoding fps,frc | 23.976,1
> [transcode] V: Y'CbCr | YV12/I420
> [transcode] A: import format | 0x55 MPEG layer-3 [48000,16,2] 121
> kbps
> [transcode] A: export format | 0x55 MPEG layer-3 [48000,16,2] 128
> kbps
> [transcode] V: encoding fps,frc | 29.970,4
> [transcode] A: bytes per frame | 6408 (6406.400000)
> [transcode] A: adjustment | -1600@1000
> [transcode] V: IA32/AMD64 accel | sse3 (sse3 sse2 sse 3dnowext 3dnow
> mmxext mmx asm C)
> tc_memcpy: using amd64 for memcpy
> [transcode] V: video buffer | 10 @ 720x480
> [import_mp3.so] v0.1.4 (2003-08-04) (audio) MPEG
> [import_ffmpeg.so] v0.1.12 (2004-05-07) (video) ffmpeg: MS
> MPEG4v1-3/MPEG4/MJPEG
> [export_ffmpeg.so] v0.3.13 (2004-08-03) (video) FFmpeg0.4.9-pre1b4756 |
> (audio) MPEG/AC3/PCM
> [import_mp3.so] MP3->PCM
> [import_mp3.so] tcextract -a 0 -i "movie.avi" -x mp3 -d 0 | tcdecode -x
> mp3 -d 0 -z 48000
> tc_memcpy: using amd64 for memcpy
> [export_ffmpeg.so] Using FFMPEG codec 'mpeg2video' (FourCC 'mpg2', MPEG2
> compliant video).
> [export_ffmpeg.so]: INFO: Selected dvd profile, ntsc video type for video
> [export_ffmpeg.so]: INFO: Set interlacing to bottom-first
> [export_ffmpeg.so]: INFO: Set frame rate to 29.97
> [export_ffmpeg.so]: INFO: Set video bitrate to 5000
> [export_ffmpeg.so]: INFO: Set GOP size to 18
> [export_ffmpeg.so] Reading configuration from
> '/home/bill/.transcode/ffmpeg.cfg'
> [export_ffmpeg.so] Config section 'mpeg2video' not found in
> '/home/bill/.transcode/ffmpeg.cfg'
> [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 0.888889
> [export_ffmpeg.so]: INFO: Selected dvd profile for audio
> [export_ffmpeg.so]: INFO: Resampling filter inactive
> [export_ffmpeg.so]: INFO: Set number of audio channels to 2
> [export_ffmpeg.so]: INFO: Set number of audio bits to 16
> [export_ffmpeg.so]: INFO: No audio resampling necessary, using 48000 Hz
> [export_ffmpeg.so]: INFO: Set audio bit rate to 224 kbps
> [export_ffmpeg.so]: INFO: Set audio codec to ac3
> skipping frames [000000-010069], 238.34 fps, EMT: 0:06:59, ( 0| 0| 0)
> [mpeg2video @ 0x2aaaad4032b0]rc buffer underflow
> encoding frame [15823], 29.05 fps, 100.0%, ETA: 0:00:00, ( 0| 0| 8)
> clean up | frame threads | unload modules | cancel signal | internal
> threads | done
> [transcode] encoded 5754 frames (0 dropped, 0 cloned), clip length 239.99 s
>
> I've done alot of reading and browsing, and the only thing I see here
> that might be an issue is the missing call in [import_mp3.so] to
> tcdemux, which I have seen in an example transcode call I found on a web
> page example somewhere. Not sure if that's an issue, or if the latest
> transcode just doesn't need it.
>
> Here's what the mplex call looked like:
>
> mplex -f8 -o movie.mpeg movie.mpeg.ac3 movie.mpeg.m2v
> INFO: [mplex] mplex version 1.8.0 (2.2.4 $Date: 2005/08/28 17:50:54 $)
> INFO: [mplex] File movie.mpeg.ac3 looks like an AC3 Audio stream.
> INFO: [mplex] File movie.mpeg.m2v looks like an MPEG Video stream.
> INFO: [mplex] Video stream 0: profile 8 selected - ignoring
> non-standard options!
> INFO: [mplex] Found 1 audio streams and 1 video streams
> INFO: [mplex] Selecting dvdauthor DVD output profile
> INFO: [mplex] Multiplexing video program stream!
> INFO: [mplex] Scanning for header info: AC3 Audio stream 00
> (movie.mpeg.ac3)
> INFO: [mplex] AC3 frame size = 896
> INFO: [mplex] AC3 AUDIO STREAM:
> INFO: [mplex] Bit rate : 28672 bytes/sec (224 kbit/sec)
> INFO: [mplex] Frequency : 48000 Hz
> INFO: [mplex] Scanning for header info: Video stream e0 (movie.mpeg.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 : 9000000 bits/sec
> INFO: [mplex] Vbv buffer size : 229376 bytes
> INFO: [mplex] CSPF : 0
> INFO: [mplex] SYSTEMS/PROGRAM stream:
> INFO: [mplex] rough-guess multiplexed stream data rate : 9419800
> INFO: [mplex] target data-rate specified : 10080000
> INFO: [mplex] Setting specified specified data rate: 10080000
> INFO: [mplex] Run-in Sectors = 89 Video delay = 13019 Audio delay =
> 16022
> INFO: [mplex] New sequence commences...
> INFO: [mplex] Audio bd: buf= 0 frame=000000 sector=00000000
> INFO: [mplex] Video e0: buf= 0 frame=000000 sector=00000000
> INFO: [mplex] STREAM e0 completed @ frame 5752.
> INFO: [mplex] STREAM bd completed @ frame 5998.
> INFO: [mplex] Multiplex completion at SCR=17244452.
> INFO: [mplex] Audio bd: buf= 14336 frame=005998 sector=00002667
> INFO: [mplex] Video e0: buf= 75005 frame=005752 sector=00027949
> INFO: [mplex] AUDIO_STATISTICS: bd
> INFO: [mplex] Audio stream length 5375104 bytes.
> INFO: [mplex] Frames : 5999
> INFO: [mplex] BUFFERING min 35 Buf max 2723
> INFO: [mplex] VIDEO_STATISTICS: e0
> INFO: [mplex] Video Stream length: 56280024 bytes
> INFO: [mplex] Sequence headers: 324
> INFO: [mplex] Sequence ends : 0
> INFO: [mplex] No. Pictures : 5753
> INFO: [mplex] No. Groups : 324
> INFO: [mplex] No. I Frames : 324 avg. size 26712 bytes
> INFO: [mplex] No. P Frames : 5430 avg. size 8769 bytes
> INFO: [mplex] No. B Frames : 0 avg. size 0 bytes
> INFO: [mplex] Average bit-rate : 2344800 bits/sec
> INFO: [mplex] Peak bit-rate : 8533200 bits/sec
> INFO: [mplex] BUFFERING min 16 Buf max 220410
> INFO: [mplex] MUX STATUS: no under-runs detected.
>
> I don't have mplayer installed because all my video tools are console
> based. I run my system primarily as a server, and prefer not to have an
> X environment. I've tried the offset parameter to mplex to no avail.
> I've tried different values with mplex -O; from 3011 (which would make
> the line:
> INFO: [mplex] Run-in Sectors = 89 Video delay = 13019 Audio delay = 16022
> match delay = 16022) to numbers that generate "data arriving too late."
> errors. I've tried the tcprobe utility to get "shift" or sync info, but
> I don't see any in there.
>
> [tcprobe] MPEG program stream (PS)
> [tcprobe] summary for movie.mpeg, (*) = 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=9000 kbps
> audio track: -a 0 [0] -e 48000,16,2 [48000,16,2] -n 0x2000 [0x2000]
> PTS=0.1780, bitrate=224 kbps
> -D 0 --av_fine_ms 0 (frames & ms) [0] [0]
>
> My best guess from the tcprobe output is that the Point Time Stamp is
> the same for audio and video, which would tend to infer that it is out
> of sync prior to being separated with transcode... maybe?
>
> Despite all my efforts, these streams aren't getting synced, they are
> roughly 1m20s out. Yes, 80 seconds. The audio is lagging behind the
> video.
>
> Any DVD authoring gurus have any sage advice?
try ffmpeg, in the meanwhile, i'm gonna read all mail above
ffmpeg -i input -target [ntsc or pal]-dvd output.mpg
;-)
vale
>
> Thanks.
>
>
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