[mythtv-users] Re: black border in ffmpeg nuvexport

Gavin Hurlbut gjhurlbu+mythtv-users at beirdo.ca
Fri Nov 19 15:55:09 UTC 2004

Chris Petersen <lists at forevermore.net> wrote:
>> I'm working on exporting to MPEG using ffmpeg in nuvexport, I can get it 
>> working really fast ( 70-120fps on my Sempron 2400+) but the only 
>> problem I have remaining is that despite the source and the destination 
>> being the same resolution (352x240) the resulting MPG has a black border 
>> all around it - the frame ends up being something like 340x232 or 
>> something odd like that...

> Does your source also have this border?  Most broadcasters add some sort 
> of padding to account for the tv's picture tube extending beyond the 
> border of the tv's frame.  That's why I added the "crop" option on the 
> nuvexport modules that I could (the ones that use transcode).

It's also possible that ffmpeg is padding it to maintain the aspect ratio of
the original recording.  Although, if it's seemingly padding on all sides, that
would almost assuredly be the capture card recording the entire TV signal
including the built-in overscan, etc.  

I may have time to look at this on the weekend, we'll have to see.


> -Chris

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