[MEncoder-users] Audio Sync issues

[Rolf Ernst]

On Mon, Sep 19, 2011 at 1:48 PM, Jeff Cranmer <jeff at lotussevencars.com>wrote:

>
> > >
> > I would cut "-af lavcac3enc=0:48 -channels 2" and put in "-oac lavc
> > -lavcopts acodec=ac3"
> >
> > BTW Rolf, where is YAMF and is it related to YAMB?
> >
> > Bill
> >
>
> Hmm - still a silent video.
>
> Evidently, it's converting something, but it must be a blank audio track
> instead of the one with the actual soundtrack on it.
>
> Here's the output from the command
> mencoder tempvid2.avi -o test.avi -ffourcc XVID -vf harddup -ovc lavc
> -oac lavc -lavcopts
> vcodec=mpeg4:acodec=ac3:abitrate=48:threads=8:vbitrate=1000:cmp=2:subcmp=2:trell=yes:v4mv=yes:mbd=2:aspect=16/9
> -noskip -mc 0
>
> MEncoder dev-SVN-r33321-4.5-openSUSE Linux 11.3 (x86_64)-Packman (C)
> 2000-2011 MPlayer Team
> success: format: 0  data: 0x0 - 0x29d24f18
> AVI file format detected.
> [aviheader] Video stream found, -vid 0
> [aviheader] Audio stream found, -aid 1
> VIDEO:  [h264]  720x480  24bpp  23.976 fps  601.6 kbps (73.4 kbyte/s)
> [V] filefmt:3  fourcc:0x34363268  size:720x480  fps:23.976
> ftime:=0.0417
> ==========================================================================
> Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
> AUDIO: 48000 Hz, 2 ch, s16le, 128.0 kbit/8.33% (ratio: 15996->192000)
> Selected audio codec: [ffaac] afm: ffmpeg (FFmpeg AAC (MPEG-2/MPEG-4
> Audio))
> ==========================================================================
> Opening video filter: [expand osd=1]
> Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1
> Opening video filter: [harddup]
> ==========================================================================
> Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
> Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264)
> ==========================================================================
> Forcing output FourCC to 44495658 [XVID].
> Encoder requires input not properly supported.Try using e.g. 'ac3_fixed'
> instead of 'ac3' as codec
> [ac3 @ 0xb8a480]No channel layout specified. The encoder will guess the
> layout, but it might be incorrect.
> Unsupported PixelFormat 61
> Unsupported PixelFormat 53
> Pos:   0.0s      2f ( 0%)  0.00fps Trem:   0min   0mb  A-V:0.000 [0:0]
> Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.
> videocodec: libavcodec (720x480 fourcc=44495658 [XVID])
> [VE_LAVC] High quality encoding selected (non-realtime)!
> Writing header...
> ODML: vprp aspect is 16:9.
> Setting audio delay to 0.096s.
> Writing header...
> ODML: vprp aspect is 16:9.
> Setting audio delay to 0.096s.
> ^CPos: 111.9s   2686f ( 1%) 26.84fps Trem: 100min 869mb  A-V:0.000
> [1006:48]
>
> Flushing video frames.
> Writing index...
> Writing header...
> ODML: vprp aspect is 16:9.
> Setting audio delay to 0.096s.
>
> Video stream: 1006.459 kbit/s  (125807 B/s)  size: 14083533 bytes
> 111.945 secs  2686 frames
>
> Audio stream:   48.000 kbit/s  (6000 B/s)  size: 674496 bytes  112.416
> secs
>
>
> YAMF = 24hourloop.com. x264 and VP8. Putting in some MPEG2 now.

http://24hourloop.com/downloads/cat_view/18-code

-- 
/re

A foolish consistency is the hobgoblin of little minds.

Ralph Waldo Emerson