[mythtv-users] 1920x1080 transcode adds "grey bar"

[Randall Hopper]

     When Myth transcodes 1920x1080i programs to MPEG-4, it incorrectly
adds a "grey bar" at the bottom of the transcoded video.

     How do I fix/suppress this?

     Note that when mythtranscode starts, it reports the source .mpg to be
1920x__1088__.  That's incorrect.  It's 1920x1080, per mytharchivehelper
and mplayer.

Thanks,

Randall

P.S. I realize this probably has something to do with MPEG-4's 16x16
     macroblocks and 1080 requiring 8 more lines to be divisible by 16.
     But it still shouldn't encode a grey bar.

Other info:

Myth 0.20.2

------------------------------------------------------------------------------
mythbackend.log:
------------------------------------------------------------------------------
  2007-11-04 11:04:22.057 JobQueue: Transcode Starting for <PROGRAM>: 3.3 GB (Low Quality)
...
2007-11-04 11:04:25.105 AFD: Opened codec 0x735710, id(MPEG2VIDEO) type(Video)
2007-11-04 11:04:25.146 AFD: Opened codec 0x735ae0, id(AC3) type(Audio)
2007-11-04 11:04:25.235 Resizing from 1920x1088 to 720x480
...
  2007-11-04 11:32:35.436 JobQueue: Transcode Finished: <PROGRAM>: 560.1 MB (Low Quality)

------------------------------------------------------------------------------
SOURCE MPG FILE
------------------------------------------------------------------------------

> mytharchivehelper --getfileinfo 1051_20071017195800.mpg.old testfile.mpg 0
2007-11-04 13:30:40.331 Opening 1051_20071017195800.mpg.old
0: start_time: 7349.196 duration: 345.192
1: start_time: 7349.157 duration: 345.197
stream: start_time: 81657.296 duration: 3835.907 bitrate=15847 kb/s
Input #0, mpegts, from '1051_20071017195800.mpg.old':
  Duration: 01:03:55.9, start: 81657.296133, bitrate: 15847 kb/s
  Stream #0.0[0x31]: Video: mpeg2video, yuv420p, 1920x1080, 65000 kb/s, 29.97 fps(r)
  Stream #0.1[0x34]: Audio: ac3, 48000 Hz, 5 channels, 384 kb/s
2007-11-04 13:30:40.376 duration = 3835

------------------------------------------------------------------------------
TRANSCODED MPG FILE
------------------------------------------------------------------------------

> mytharchivehelper --getfileinfo 1051_20071017195800.nuv testfile.mpg 0
2007-11-04 13:32:09.514 Opening 1051_20071017195800.nuv
0: start_time: 0.000 duration: 5.681
1: start_time: 0.000 duration: 5.681
stream: start_time: 0.000 duration: 5680.569 bitrate=1411 kb/s
Input #0, nuv, from '1051_20071017195800.nuv':
  Duration: 01:34:40.5, start: 0.000000, bitrate: 1411 kb/s
  Stream #0.0: Video: mpeg4, yuv420p, 640x480, 29.97 fps(r)
  Stream #0.1: Audio: mp3, 48000 Hz, stereo, 1411 kb/s
2007-11-04 13:32:09.521 duration = 5680