[mythtv-users] 0.21 video profiles not working as expected for live TV

[Matt Doran]

Hi there,

I'm using the following version:
    MythTV Version   : 16733
    Library API      : 0.21.20080304-1


I've previously been  using a basic profile that just used bob 
deinterlacing, and wanted to try the new deinterlacers.  So I started 
with the "high quality" profile, which uses yadif(x2) for SD content, 
and reverts back to linearblend for HD (>= 1920x1080).

I'm doing these tests using live TV and a DVB-T.  When I use this 
profile, it works as expected for SD content, choosing the profile for 
SD content with the yadif(x2).

However when I view a HD channel, it chooses the wrong profile (or at 
least the wrond deinterlacer).  I beleive this has something to do with 
the "dummy video" that it sets up which has a resolution of 720x576 
while waiting for the channel to tune.

I've got some verbose "playback" logging showing the problem.  You can 
view the log at the Pastebin URL below.... I've highlighted some of the 
interesting lines.

    http://pastebin.com/me3897fc <http://pastebin.com/m535e1e28>

In summary:
 * You can see I have a >= 1920x1080 profile that uses linea blend (line 10)
 * It seems to start initialising video at resolution 720x576 (line 29)
 * Myth picks the video profile based on this dummy resolution (line 40)
 * The yadif interlacer is initialized with resolution 720x576 (lines 85 
and 86)
 * Once the tuner locks onto the HD channel, the video comes in at 
1920x1088 resolution (line 178)
 * The Yadif deinterlacer recognizes the change in video resolution 
(line 180)
 * Video cannot be displayed properly because yadif(x2) requires too 
much processing power for HD (lines 231-239).


If I watch a previously recorded show it works as expected, because it 
starts playing the content that is 1920x1080 resolution ... so that it 
sets up the profile correctly.   This problem only seems to appear when 
using live TV which sets up the dummy 720x576 stream to start.

This seems like a pretty serious problem with the video profiles for use 
with live TV.   It means I can't use yadif(x2) because it breaks live TV 
for HD content.   Is there something I'm doing wrong / missing?

Should I raise an issue for this?

Thanks,
Matt