[Mjpeg-users] Video Artifacts Transcoding MythTV .nuv files to DVD
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=1356alloc_id=3438op=click ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
Re: [Mjpeg-users] 1.6.1.93: Bad quality
Hi all, It looks like there is, someplace, a mismatch problem lurking in the Arithmetic routines. Basically, different rounding between the (internal) decoding done in mpeg2enc for calculating the difference between the image to encode and the decoding of its predecessor and what is happening in the MPEG decoders. I really really need a short sequence the shows the Problem because otherwise it is almost impossible to track down precisely. Andrew --- 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=1356alloc_id=3438op=click ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
Re: [Mjpeg-users] Video Artifacts Transcoding MythTV .nuv files to DVD
HI, 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? Well computer hardware Problems definately aren't the cause. It *could* be a bad burn (errors on the DVD). The kind of problems you're seeing are the kind of thing that shows up when the player can't read the MPEG data without errors. The type of problem you're having would also be pretty weird for a Bug in the encoding/authoring tools. cheers, Andrew --- 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=1356alloc_id=3438op=click ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
[Mjpeg-users] Re: [Dvdauthor-users] Video Artifacts Transcoding MythTV .nuv files to DVD
--- Scott T. Smith [EMAIL PROTECTED] wrote: On Tue, 2004-02-24 at 00:05, Mike Smith wrote: 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? for a given video, is the problem always in the same place? i.e. if for a given TV show, does it start at 27 minutes on the clock no matter what you do for the first 26 minutes? if you stick the disc in and immediately fast forward to 26 minutes into the show, will it show up a minute later? Yes, its starts in the same place. If I reburn the .iso file, it starts in the same place. If I remove the .iso file and iso directory and start at the dvdauthor step, the problem starts in the same place. I re-transcoded the first program that showed this problem. I used a higher maximum bitrate, thinking that was the problem. The artifacts started a minute or two later. does mplex complain about buffer underruns? (are you sure it is using the correct vbr buffer size?) I'm using tcmplex. I just reran the tcmplex step and captured the output in a file. The ONLY mention of buffer is: Vbf buffer size : 229376 bytes Here's the summary info for the video portion: INFO: Found 160828 picture headers, stream bit offset 12008418328. INFO: Video stream information INFO: Stream length : 1501052291 INFO: Total time (seconds) : 5366 INFO: Sequence start : 10825 INFO: Sequence end : 3 INFO: No. Pictures : 160828 INFO: No. Groups : 10825 INFO: No. I Frames : 10825 avg. size 29742 bytes INFO: No. P Frames : 42918 avg. size 11073 bytes INFO: No. B Frames : 107085 avg. size 6573 bytes INFO: No. D Frames : 0 avg. size 0 bytes INFO: Horizontal size : 720 INFO: Vertical size : 480 INFO: Aspect ratio : 0.6735 INFO: Picture rate : 29.970 frames/sec INFO: Bit rate : 375000 bytes/sec (300 bits/sec) INFO: Computed avg rate : 28 bytes/sec (224 bits/sec) INFO: Computed max rate : 423400 bytes/sec (3387200 bits/sec) INFO: Vbv buffer size : 229376 bytes INFO: CSPF : 0 INFO: INFO: Scanning audio stream for access units information ThOe: layer=1 bit_rate=384 freq=48.00 slots=144 try running ogle instead of mplayer on the resulting burned DVD to try to mimic the problem. Scott __ 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=1356alloc_id=3438op=click ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
[Mjpeg-users] multiple dc10+ cards
Setting up a system with two dc10+ cards, one for capture and the other for playback. I was hoping someone could give me a tip on how to configure lavrec lavplay to access the different cards. The system will be in consent record while letting the user playback any of the captured segments without shutting off the lavrec function. I've seen the LAV_VIDEO_DEV env variable, but I'm unsure how to set it to two different cards. I came across the -zrdev option in MPlayer, does anything like that exist in lavtools? Thank-you --- 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=1356alloc_id=3438op=click ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
