[MEncoder-users] Audio sync problems with HDV footage while performing an inverse telecine

[Eric Wescott]

Thanks for the suggestion. I ran a few tests and here is the results

mencoder Tape015-0008.m2t -noskip -fps 30000/1001 -vf
pullup,softskip,harddup,scale=1920:1080 -ofps 24000/1001 -ovc lavc -lavcopts
vcodec=ffvhuff:autoaspect -oac pcm -o Tape015-0008.avi
Slate clap seems in sync but everything else is off about ~300ms

mencoder Tape015-0008.m2t -mc 0 -noskip -fps 30000/1001 -vf
pullup,softskip,harddup,scale=1920:1080 -ofps 24000/1001 -ovc lavc -lavcopts
vcodec=ffvhuff:autoaspect -oac pcm -o Tape015-0008a.avi
Slate clap off but everything else seems okay

mencoder Tape015-0008.m2t -mc 0 -noskip -fps 30000/1001 -vf
pullup,softskip,harddup,scale=1920:1080 -ofps 24000/1001 -ovc lavc -lavcopts
vcodec=ffvhuff:autoaspect -oac pcm -delay -0.222 -o Tape015-0008b.avi
Slate clap is okay, starts off okay but then loses it's sync

mencoder Tape015-0008.m2t -mc 0 -noskip -fps 30000/1001 -vf
pullup,softskip,harddup,scale=1920:1080 -ofps 24000/1001 -ovc lavc -lavcopts
vcodec=ffvhuff:autoaspect -demuxer lavf -oac pcm -o Tape015-0008c.avi
Slate clap is off but everything else seems okay

mencoder Tape015-0008.m2t -mc 0 -noskip -fps 30000/1001 -vf
pullup,softskip,harddup,scale=1920:1080 -ofps 24000/1001 -ovc lavc -lavcopts
vcodec=ffvhuff:autoaspect -demuxer lavf -oac pcm -delay -0.222 -o
Tape015-0008d.avi
Slate clap is off but everything else seems okay

The slate being off isn't a HUGE deal as it's sync sound from the camera but
I'm confused as to why it would start out of sync and then return to
normal... Any idea how long it takes to get back into sync? I'm concerned if
we have a faster slate and action called sooner in other clips if it will
start out of sync...

Thanks for the help

Eric Wescott

On Mon, May 3, 2010 at 10:54 PM, Andrew Berg <bahamutzero8825 at gmail.com>wrote:

> On 5/3/2010 1:22 AM, Eric Wescott wrote:
> > Any suggestions?
> Try adding -demuxer lavf. Using the lavf demuxer has been necessary (at
> least for me) when the input is in an MPEG-TS container.
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