[mythtv] Re: Ticket #374: Recording thumbnail generation fails

[Daniel Kristjansson]

On Tue, 2005-10-11 at 07:33 +0100, Stutty wrote:
> I have just come across one of these 136 byte .png thumbnails, but I'm
> not sure I have the same problem because:
> 
> a) I'm using svn revision 7192
> b) I'm not using commercial flagging
> c) The point 4 minutes into the program (where the Thumb is generated)
> is a completely blank black screen - as is the png.
> d) The png file appears to have valid headers within it, and opens
> okay in gimp, etc.
It is a good PNG, it is just not avoiding black screens 
because you don't have commercial flagging turned on.

> Anyway I've uploaded the offending png
> [http://www.salts.plus.com/blank.png], is it possible that it is
> actually a valid PNG, or is there another problem with thumbnail
> generation?
> 
> I'm assuming there is a good reason why the macro "READ_TEST_SIZE" is
> set to the number 204, i.e. this is larger than the usual minimum file
> size?
I'm assuming this is the smallest possible NUV file, but the
minimum PNG file is just 8 bytes.

The minimum PNG file containing anything is 20 bytes,
so that should probably be our test size for a PNG.

-- Daniel