[mythtv-users] Transcoding: Audio/Video Sync
Matt Vollmar
matt at vollmars.com
Tue Dec 7 17:36:43 UTC 2004
OK, I know this has been hashed around a bunch on this list, and I
searched for anything that might help, but I couldn't find something to
address this issue (I'm sure I didn't search long enough). I transcoded
(manually from the command line) a movie last night, and looked at it
today to find an ever so slow loss of sync between audio and video. The
video ends up about .5 seconds faster by the end of the movie. In the
original, it is not thus. Is there a way for me to fix this? Here is
the command line stuff I use:
mythtranscode --showprogress -p autodetect -c 1073 -s
2004-11-25-12-00-00 -f . 2>&1 > /dev/null
ffmpeg -f rawvideo -s 480x480 -r 29.97 -i ./vidout -y -f s16le -ar 32000
-ac 2 -i ./audout -b 1152 -vcodec mpeg1video -s 640x480 -hq -deinterlace
-qmax 3 -qmin 13 -ar 44100 -aspect 4:3 "./You_Only_Live_Twice.mpg"
It is possible that some of my parameters are not correct. I got these
from someone who said they were good quality, which they are very
acceptable. Plus, it transcodes at just a hair slower than real-time,
so that part rules. Should I use fifosync on the mythtranscode command
line or what? Should I not deinterlace?
Thanks for any help,
Matt
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