Hi,
Sorry for the wide distribution. I'm getting strange
video artifacts in some ( not all ) of the DVDs that
I've burned. I'm hoping someone has seen something
similiar and can give my some insight into the
possible problem.
I'm capturing video from my Satellite dish using
MythTV. Using the MPEG4 .nuv file format captured
at 640x480. I process the files using mythtranscode,
ffmpeg, yuvdenoise, yuvscaler, mpeg2enc, and tcmplex.
I'm upscaling to 720x480 video and 48Khz audio.
Resulting file is put through dvdauthor, mkisofs, and
growisofs to actually burn to a DVD+R.
Playing my burned DVD in my standalone DVD player, it
will start out fine for around 30 minutes before
having
problems ( 27,30, 34, and 40 minutes in the 4
effected)
Problems are mostly a horizontal line across the
screen that is maybe 5 percent of the total screen
height. How far above the bottom of the screen
varies.
This garbled line will exist maybe a second or two,
then disappear for 6 - 10 seconds, then reapear
somewhere else.
On two of the recordings I also get rectangles that
go black for a second or two, then go back to the
having a picture in them. On a 27 inch screen the
rectangles are about 1/2 inch wide by 1/4 inch high.
Facts:
1) All recordings captured at same resolution,
bitrates, etc.
2) All transcoding done with exact same options and
settings. I have played with increasing max
bit rate, but it has no effect.
3) Effecting a few, but not all of my recordings.
4) Doing transcoding on three different computers.
A 2.4 Ghz Pentium 4 system which is also my
NFS file server for the others two. A 1Ghz Pentium
4 system, and a 2Ghz Pentium 4 Laptop. I'm trying
to see if transcoding the same movie on all three
systems gives me the same problem.
5) The first time I saw this problem, I re-transcoded
at a higher bitrate. Problem was still evident,
but started about 3 minutes longer into the
program.
6) I've burned a LOT of 30 minute programs ( 20
minutes
with commercials removed ) without seeing this
problem. It has only occured in longer programs.
7) Playing the transcoded file ( before burning ) with
Mplayer I don't see the artifacts. Its like they
aren't in the MPEG 2 source files.
8) Three out of the four movies experience problems
with GMplayer's skip controls. I play the movie
file ( not on DVD, yet ) and try to skip ahead
one minute. It won't do it.
9) MPlayer uses the libmpeg2 codec to play the MPEG2
output file from the transcoding process.
10) I can play the first ~30 minutes on my DVD Player
just fine. I can fast forward. But, when the
artifacts start, fast forward stops working. It
just freezes.
11) I'm using a Sony DVD+/-RW DRU-530A burner. Its
rated at 8X. I'm using Memorex 2.4X DVD+R
media.
12) When I burn, I stop everything else on the
computer.
13) I am using Redhat 9.
14) I can provide version numbers of all the sofware
I'm using and all the options for each command
if that will help.
Has anyone seen anything similiar to this? Is it
possible that my computer is overheating and screws up
the calculations? Could one of my computers have
a hardware problem that is manifesting itself this
way? Is it my DVD burner?
Any help much appreciated.
Mike
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