[FFmpeg-user] Audio sync issues when transcoding Hauppauge HDPVR content

tracey jaquith tracey at archive.org
Tue Jan 15 21:25:05 CET 2013

On Jan 15, 2013, at 11:35 AM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:

> Scott Naef <snaef1 <at> mail.brookdalecc.edu> writes:
>> I have tried several options in FFMPEG such as 
>> -async 1 but nothing I try seems to work.  I always 
>> end up with about 1.5 second delay in video from audio.
> Please provide a sample that is long enough to 
> easily (!) see the desync.
> And please provide the command line you tested 
> for transcoding (ideally for the sample you 
> provide) together with complete, uncut console 
> output.
> Carl Eugen
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> ffmpeg-user at ffmpeg.org
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Hi Scott,

I've had similar problems, and have posted recently with subject

confusion with "-vsync 1" / "-vsync cfr" and "-map" (to sync audio to video

to this forum.  We have a big TV archive that I run technically.

Try instead:
    -vsync 1
that's our smoking gun here.

(various attempts with args over years had various problems like these, for us, for various reasons, with our TV:
-vsync 0
-async 1
-muxdelay 5 -copyts -async 88200 -adrift_threshold 5 -dts_delta_threshold 5 

YMMV, but it might help you!

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