[FFmpeg-devel] [PATCH] swscale-test: add md5 output

[Vitor Sessak]

On 07/31/2010 11:10 PM, Ramiro Polla wrote:
> Hi Michael,
>
> On Sun, Jul 25, 2010 at 9:54 PM, Michael Niedermayer<michaelni at gmx.at>  wrote:
>> On Sat, Jul 24, 2010 at 02:10:32PM -0300, Ramiro Polla wrote:

[...]

>> SSE of 123 does not implicate that there is no change to a previous SSE of 123
>> and a change of CRC does tell nothing of the SSE
>
> For regression tests we want a checksum to be bitexact (I'll send a
> patch to add the bitexact flag to sws_flags later), and in this case
> the SSE doesn't matter.

It does, because every time there is a patch that is expected to change 
the CRC (and thus update the reference output of the tests) it is easy 
to know if it improves or reduce the PSNR by just looking at the diff of 
the reference file. That's the reason why "make test" prints also the 
psnr/stddev.

-Vitor