dnk wrote:
This is a fascinating problem to me. I have the same exact problem, but *only* with 720p. With 1080i I have no syncing issues at all. The process that I use is to use ProjectX to demux and fix any out of order packets, and error correct the video/audio as much as possible, then I transcode the video to mpeg4 (ffmpeg) *only* with transcode, then I use avimerge to merge the ac3 audio back into the mpeg4 video. It's a great process for keeping my original 5.1 ac3 track, and produces a nicely compressed video, but the syncing issue for 720p remains. As you said, the results never vary. Mine usually measures out at almost exactly 1 second / hour of video. I've even gone so far as to map the A/V sync buttons to a couple buttons on my remote, then every 7-8 minutes during playback, I give the video a little 'bump' of about 100ms.Pardon me if this has been discussed previously; I was not able to find any relevant posts.
For a few months, I have been trying to find a way to export ATSC .nuv files (from pcHDTV) to any format that would be easily portable for laptop viewing. nuvexport is the obvious tool for the job, and I have tried every possible export format. In every case, the audio and video become increasingly out of sync on playback. For playback, I have tried mplayer (linux), xine (linux), Media Player (win32), mplayer (win32), and several others, with zero success. The audio invariably gets ahead of the video. Within 30 minutes, the sync error is annoying (~.25-.5 seconds); withing 45-50 minutes, it is unwatchable (> 1 second).
Is there any way to get a properly synced export of HDTV ATSC .nuv files? Can anybody get usable, synchronized .mpg, .asf, Divx, Xvid, or other exports to work?
Starting with a .17 base (ATRPMS), I am using CVS versions for the frontend and backend and for nuvexport, updated every few days until current. The results never vary. Frontend running nuvexport is running Fedora Core 3 with all Fedora updates to kernel 2.6.10-1.770 on an Athlon XP 2500+ CPU.
D. Knisely
By the way, this has been happening for me ever since MythTV 0.15 and FC1, so I don't think it's a MythTV issue.
-- John Sturgeon <>< http://www.sturgeonfamily.com/mythtv.php
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