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[libdv-dev] dvavi destroys audio/video sync
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From: Bradley R. <b_r...@ya...> - 2003-05-05 12:52:02
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I've been struggling in trying to devise a way to 'play' videos
of various types - mpeg, DivX, etc - down to my camcorder via its
IEEE1394 interface. Basically I'm using MPlayer's 'mencoder'
program to convert these videos into digital video AVI-type-2 files,
converting those files into raw-dv using libdv's 'dvavi' and then
using dvconnect to transfer the digital video down to the camcorder.
In all cases I'm finding that 'dvavi' drastically loses synchronization
between audio and video. With 11 test files of various types -
DivX, Mpeg-1, Mpeg-2, ASF - 'dvavi' completely garbles the video on
6 of them (which I'm not too worried about - low-quality ASF and the
like), plays the audio 'way out in front' of the video for 4 and
vice-versa for one. I'm using mplayer and playdv to play the raw-dv
file and also using dvconnect to download it to the camcorder as a
triple-check.
I can use dvgrab to take dv-type-2 from my camcorder and use dvavi to
convert that to raw-dv, and in that case dvavi *doesn't* disrupt the
A/V synchronization. So I'm hoping there's some parameter somewhere
which someone can tell me to adjust to make this work.
I'm using MPlayer's mencoder to produce AVI-type-2 files as follows:
mencoder [-srate 48000] -vop scale=720:576 -ovc libdv -oac pcm
-o out.avi video.mpg
(on some tests I resample the audio to go from 44100Hz to 48000Hz, as
suggested by Drew Perttula in this list. It makes no difference as to
the loss of synchronization in the resulting raw-dv file).
When I run dvavi to produce a raw-dv file suitable for dvconnect from
the output of mencoder I get this output on stderr:
Found audio channel: format: ft=1
Opening audio source with:
Channels: 2
Frequency: 48000
Bytes per second: 192000
Byte alignment: 4
Bits per sample: 16
AVI: Short read!
I've appended the output of an 'mplayer -identify out.avi' at the end
of this message to show the details of the AVI-type-2 file that mencoder
produces for input to dvavi.
I'd appreciate anyone's help on this; it's got me beat. If I could fix
this the whole project will work - without it I can't see any way of
doing this (under Linux, anyway). I've exhausted all other avenues that
I know of to (somehow!) get my videos through to the camcorder -
transcode, avidemux, libdv, etc.
Thanks,
Brad Rosser
b_rosser at yahooNOSPAM dot com
-- identify of AVI-2 file; dvavi loses sync on producing DV from it --
MPlayer 0.90rc5-2.95.3 (C) 2000-2003 Arpad Gereoffy (see DOCS)
CPU: Intel Celeron 2/Pentium III Coppermine,Geyserville (Family: 6, Stepping:
6)
Detected cache-line size is 32 bytes
CPUflags: MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 0
Compiled for x86 CPU with extensions: MMX MMX2 SSE
Reading config file /usr/local/etc/mplayer/mplayer.conf: No such file or
directory
Reading config file /u/root/.mplayer/config
Reading /u/root/.mplayer/codecs.conf: can't open
'/u/root/.mplayer/codecs.conf': No such file or directory
Reading /usr/local/etc/mplayer/codecs.conf: 50 audio & 136 video codecs
font: can't open file: /u/root/.mplayer/font/font.desc
Font /usr/local/share/mplayer/font/font.desc loaded successfully! (206 chars)
Using Linux hardware RTC timing (1024Hz).
Can't open input config file /u/root/.mplayer/input.conf : No such file or
directory
Can't open input config file /usr/local/etc/mplayer/input.conf : No such file
or directory
Falling back on default (hardcoded) input config
Playing wish_1.avi
AVI file format detected.
VIDEO: [dvsd] 720x576 24bpp 23.98 fps 27620.2 kbps (3371.6 kbyte/s)
Clip info:
Software: MEncoder 0.90rc5-2.95.3
==========================================================================
Opening audio decoder: [pcm] Uncompressed PCM audio decoder
AUDIO: 48000 Hz, 2 ch, 16 bit (0x10), ratio: 192000->192000 (1536.0 kbit)
Selected audio codec: [pcm] afm:pcm (Uncompressed PCM)
==========================================================================
ID_FILENAME=wish_1.avi
ID_VIDEO_FORMAT=dvsd
ID_VIDEO_BITRATE=27620232
ID_VIDEO_WIDTH=720
ID_VIDEO_HEIGHT=576
ID_VIDEO_FPS=23.976
ID_VIDEO_ASPECT=0.0000
ID_AUDIO_CODEC=pcm
ID_AUDIO_FORMAT=1
ID_AUDIO_BITRATE=1536000
ID_AUDIO_RATE=48000
ID_AUDIO_NCH=2
ID_LENGTH=59
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