[mythtv-users] Transcoding and aspect ratio (DVB-T)

Ian Grant mailinglists at iangrant.me.uk
Tue Feb 28 16:12:42 UTC 2006


Chris Pinkham wrote:
> There is no other place that rewrites the header on the .nuv file, so if the
> value is 1.77777 in the WriteHeader() method, then that is what goes into the
> file.  Are you sure that the output file you are looking at is the right one?
> Are you running mythtranscode from the command line, if so what command line
> are you using?  IF you are running from the command line, then can you run
> the command again but hit CTRL-C after 30 seconds or so so you have a partial
> file created, then run nuvinfo on that.
>   

Originally of course, the problem occurred from within MythTV, but the
recent testing I have been doing on the command line. I changed the
LD_LIBRARY_PATH so that I am using the version of the libraries that I
want to (with the VERBOSE changes).
The file is definitely right, because my command line is:
LD_LIBRARY_PATH=../../libs/:../../libs/libmythtv/:$LD_LIBRARY_PATH
./mythtranscode -i /video/mythtv/recordings/1001_20060219235500.mpg -o
test.nuv
So obviously I'm looking at test.nuv.
At first I let it encode the whole file, but after a while I just did
CTRL-C as soon as I ran nuvinfo on the file whilst it was encoding and
it reported 1.3333, or after opening the file in VLC/MPC and observing
4:3 rather than 16:9.

>
> If you're running under windows, something has to be parsing the nuppel header
> on the file and it may be interpretting the data incorrectly.  Originally,
> myth did not support the aspect field in the .nuv header, but that was fixed a
> long time ago.  I assume
>   
Okay, it might be, not sure how I would investigate that.

>
> There isn't much that can be going wrong if you're seeing the right value in
> WriteHeader().
>
> I'd ask to have a copy of the file, but I don't think that will help any since
> the player is detecting the aspect ratio properly.  If the above CTRL-C test
> doesn't give any clues, is there any way you can send me the first couple megs
> of both the original and transcoded files?
>   

Sure, where shall I send them?

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