[mythtv-users] transcode command line to prevent 1080i grey bars?

[Tom Dexter]

On Sun, Jul 20, 2008 at 7:25 PM, Nick Rout <nick.rout at gmail.com> wrote:
> On Sat, Jul 19, 2008 at 4:10 PM, Tom Dexter <digitalaudiorock at gmail.com> wrote:
>> I've been trying basically forever to figure out how to create DVDs
>> from HD DVB recordings that actually have audio and video in sync.
>> I've ended up dropping this awful project countless times out of
>> frustration...sometimes I think I'm more likely to build a nuclear
>> reactor out of balsa wood...:D.
>>
>> I've seen suggestions here about demuxing with projectx.  I've gotten
>> much farther doing that, and it does seem to correct sync issues.
>> However now I'm running into the issue where transcode interprets
>> 1080i as 1920x1088 and creates that grey bar at the bottom.  Note that
>> this is the transcode command like program, not mythtranscode.
>>
>
> Is this an error in parsing some test it does on the video?
>
> I note that 1080 is not divisible by 16, but 1088 is. Is transcode
> rounding up to the nearest multiple of 16?
>
> Might you be better to crop 4 lines off the top and bottom to take it
> down to a multiple of 16? (1080-4-4=1072, which is divisible by 16).
>
> I really don't know, but I do know that all the guides say to
> transcode to frame sizes that are divisible by 16.
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Actually I ended up taking a different approach altogether, one which
seems to work really well.  After demuxing with projectx I reencode
the video using mencoder and and then remux to a vob file with
tcmplex-panteltje.  That seems to work just great.  I'm not sure what
transcode was doing or why.

I had one show I had held onto for a long time, as I wanted to make a
DVD out of it, but is just plain _wouldn't_ demux/encode/remux with
acceptable audio/video sync...it would get like 2 seconds out no
matter what I did.  The above method handled it perfectly.

That projectx really is a must-have for demuxing DVB.

Tom