[mythtv-users] H264 conversion of interlaced MPEG2?

[Dave MythTV]

Hello everyone.

I'm running some tests, preparing to reconfigure my backend to transcode
certain shows from US-broadcast ATSC MPEG2 to H264 for hardware accelerated
playback on our various portable devices.  In doing this, I've been
experimenting with Mike Stucky's user job script:
https://www.mythtv.org/wiki/Transcode_Mpeg2_to_H264


However, I've hit a snag...  If I run this script on an MPEG2 file with
interlaced SD content, MythTV no longer recognizes the resulting H264 file
as being interlaced, and playback in the MythTV frontend shows interlacing
artifacts.

I know I could modify Mike's script to specifically deinterlace the content
before or during the H264 conversion... but I didn't think this would have
been necessary?   Shouldn't it be possible to convert interlaced MPEG2 to
interlaced H264, and continue using the frontend's deinterlacer?


Additional information:
'mediainfo' detects the input MPEG2 file as being interlaced, but shows the
output H264 file as being progressive scan.  So I think this might be an
issue with the ffmpeg conversion flagging (or encoding) the
non-deinterlaced output as progressive... and not an issue with MythTV's
player?


Thanks for the help.
- Dave
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