David Shay wrote:
----- Original Message ----- From: "Brad Templeton" <[EMAIL PROTECTED]>
=> Or you could write a script to transcode/down-rez the HD version and
keep it in videos. It will look much better than any version recorded
off something like a pvr-250, and may look better than a version recorded
off the SDTV digital subchannel, if that's what you are doing.
I am recording the SD versions on a pvr-250.
Well, I've tried various ways to transcode/downres the shows from the HD
channels and I can get that working well enough for actual Mythfrontends.
My problem is that I am also using some Hauppauge MediaMVP psuedo-frontends
and I can't seem to get a working mencoder or other command to transcode
down and play correctly, i.e. with correct A/V sync and the ability to skip
forward/backward correctly. Yeah, that's really an issue for the MVP list,
but that's why it's not a real suitable solution at the moment. Anyone care
to share there favorite command lines to downres HDTV content?
David,
You can use projectX to demux the video and audio then use transcode on the video, then avimerge to remux them:
my transcode parameters are as follows (two pass for best quality lowest file size)
transcode --nice +10 -y ffmpeg -F mpeg4 -Z 640x,fast ***
*** optionally, --export_asr [23] (2=4:3 3=16:9) -w nnnn (bitrate) -R [123] (multi-pass, single pass, etc) -I [34] (deinterlacing)
Here is what I would do for 1920x1080i
1) use projectx to demux and fix out of order packets (resulting in *.mpv *.ac3)
2) use transcode to transcode the video down
first pass:
transcode --nice +10 -y ffmpeg -F mpeg4 -Z 640x,fast -I 4 --export_asr 3 -R 1 -w 2000 -i filename.mpv -o /dev/null
second pass:
transcode --nice +10 -y ffmpeg -F mpeg4 -Z 640x,fast -I 4 --export_asr 3 -R 2 -w 2000 -i filename.mpv -o outputfile.nosound.avi
3) use avimerge to multiplex the ac3 back into the avi
avimerge -i filename.ac3 outputfile.nosound.avi -o outputfile.avi
Then I move the file over to my videos directory for MythVideo to playback (using mplayer).
Ways to speed up the transcoding process:
1) don't deinterlace (delinterlace on playback using mplayer -vf pp=lb)
2) do single pass, and bump the bitrate up
3) don't resize (if disk space is the issue, you can just re-encode to MPEG4 HD at about 5k bitrate.)
-- John Sturgeon <>< http://www.sturgeonfamily.com/mythtv.php
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