[mythtv-users] Still little luck with nuvexport

Brad Templeton brad+myth at templetons.com
Mon May 30 19:46:16 UTC 2005


Still trying to figure out a good path to working nuvexport.  Trying
mpeg2cut, I continue to get the strange behaviour where it writes
out about 1.5gb of output quickly (which is not just to the first
commercial break, it has a couple of breaks in it) and then seems to
output nothing for a very long time.

Eventually it dies with the diagnostic shown below.


This is a 720p HDTV recording, mp2 of course., 


Encode started:  Mon May 30 11:54:48 2005
mpeg2cut v177
Using mode Xvfb
Filename "/video/myth/(redacted).nuv"
OutFile "./(redacted).mpg"
Last Frame 868349
Cutlist "4515-57929 74539-112907 126829-151550 169295-195424 212121-239166 253319-294606 313052-354939 371779-405634 423274-448570 466257-498448 517808-552556 571222-608292 628050-671936 689756-718880 737434-789714 807386-856100 868330-"
Finding the AV Offset to use with lvemux: 0 (not detected)
Indexing the file with avidemux2
Cutting out commercials with avidemux2
./mpeg2cut: line 162: 28224 Aborted                 nice -n 19 avidemux2 --load-workbench ${BASENAME}.cut --audio-codec MP2 --save-raw-video ${BASENAME}.m2v --save-raw-audio ${BASENAME}.mp2 --quit 2>/dev/null >/dev/null
Remultiplexing video
GOP timestamps will be rebuild   
ERROR: opening A/V streams (0/1)
Cleaning up
rm: cannot remove `2007_(redacted).mp2': No such file or directory

Encode finished:  Mon May 30 12:35:22 2005
Encode lasted: 40m 34s



Attempts to actually transcode also fail.  In this case transcode without
scale, no deinterlace (of course), no denoise, one pass, no crop.

    a) With mencoder, immidiate failure (bug already in tracker)
    b) with transcode->xvid -- resulting video unplayable, pretends
       to play but shows blank screen
    c) ffmpeg->xvid -> Unusably slow -- 4fps (on 60fps show)
    d) ffmpeg->divx -> 20fps (tolerable) but audio goes way out of sync
            by end.


Anybody got some examples of parameters to use for transocding 720p
mp2s, with cutlist that have good results?  I have been able to do it
myself in mencoder just fine, but that's without cutlist.  If I could
get a working mpeg2cut I could then transcode with mencoder.

Also, anybody played with doing inverse telecine on 720p recordings
and the right parameters to use for it?   Film (24fps) transferred
to 60fps 720p doesn't have interlace to worry about but it does do
lots of frame duplciation which one might as well remove in a transcode.


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