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 __________________________________ Do you Yahoo!? Yahoo! Mail SpamGuard - Read only the mail you want. http://antispam.yahoo.com/tools ------------------------------------------------------- SF.Net is sponsored by: Speed Start Your Linux Apps Now. Build and deploy apps & Web services for Linux with a free DVD software kit from IBM. Click Now! http://ads.osdn.com/?ad_id=1356&alloc_id=3438&op=click _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users