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TarChul
n00b
Joined: 30 Dec 2004
Posts: 20
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 Posted: Wed Jan 11, 2006 10:26 am Post subject: mencoder constant audio delay (ffmpeg related?) |
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hi,
whenever i try to encode dvds to mpeg4 with mencoder, i can see a constant audio delay of about 200-500 ms. i tried reemerging mplayer, ffmpeg, even my whole system (during a recent upgrade to gcc 3.4). nothing helped.
it doesn't matter if i reencode to mp3 with lame or use -oac copy. i haven't tried a different video codec, but since the sound problem seems to be the same regardless of the audio encoding, my guess is it's a video codec problem.
| Code: |
cat vob/020/foobar-00* | mencoder -noskip -vf crop=696:424:12:78,hqdn3d=2:1:2,scale=640:288 -oac copy -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=1800:v4mv:mbd=2:trell:cmp=3:subcmp=3:mbcmp=3:autoaspect:vpass=1 -o /dev/null -aid 129 -
cat vob/020/foobar-00* | mencoder -noskip -vf crop=696:424:12:78,hqdn3d=2:1:2,scale=640:288 -oac copy -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=1800:v4mv:mbd=2:trell:cmp=3:subcmp=3:mbcmp=3:autoaspect:vpass=2 -o baz.avi -aid 129 - |
my mplayer (latest stable) is now compiled with custom-cflags (-O2 -march=pentium-m, -pipe, -fomit-frame-pointer, nothing fancy), but this didn't change anything either.
ffmpeg-0.4.9_p20051216
mplayer-1.0_pre7-r1
i also tried transcode, seems to have similar results.
for now i'm muxing into the matroska container where i can set the audo delay before muxing. but i'd also like to create regular avis.
all help is appreciated |
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Attila
Tux's lil' helper
Joined: 28 Feb 2003
Posts: 93
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| Posted: Thu May 04, 2006 5:21 pm Post subject: |
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Hiho,
I have the same problem with some DVD's - first i thought i made something wrong, but i found out this depends on the DVD ...
I use transcode with the "-D" option (in my case "-D -25")
Atti |
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moob7
Tux's lil' helper
Joined: 22 Jan 2006
Posts: 80
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| Posted: Sun May 14, 2006 2:53 am Post subject: Re: mencoder constant audio delay (ffmpeg related?) |
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| TarChul wrote: | hi,
whenever i try to encode dvds to mpeg4 with mencoder, i can see a constant audio delay of about 200-500 ms. i tried reemerging mplayer, ffmpeg, even my whole system (during a recent upgrade to gcc 3.4). nothing helped.
it doesn't matter if i reencode to mp3 with lame or use -oac copy. i haven't tried a different video codec, but since the sound problem seems to be the same regardless of the audio encoding, my guess is it's a video codec problem.
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Interesting. I found this thread because I am having a similar probelm: I get a (nearly) constant delay of 100 to 200 ms). What is interesting is that I did not have this problem until this week when I did an emerge world. So something in the lavc codec libraries and/or mencoder may have changed and gone wacky. I suppose we should both try emerging an older version of mencoder and <??other packages??>.  |
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