Fix incorrect PAR in qtblend transition

[j-b-m]

With the addition of normalize_mlt_source_size in 86b1877, the frames with a PAR != consumer PAR had their size adjusted twice, resulting in incorrectly sized images. A 1.3333 PAR 1440x1080 video (which should appear full screen in a 1920x1080 project) was scaled down and appeared with a large black border.

Kdenlive bug #522730

[ddennedy]

@guiodic please review

[guiodic]

@guiodic please review

That looks like an excellent solution to me

[ddennedy]

This change introduced a major regression reported here:
https://forum.shotcut.org/t/some-files-are-horribly-blurry-in-my-project/51785

I am going to revert it, but I wonder if I should revert 86b1877 as well.

I reproduce it with a command line like:
melt -profile atsc_1080p_25 color:white -track /path/to.png -attach affine transition.rect=25%,25%,50%,50% -transition qtblend
The PNG I am using is 512x512, less than 1920x1080.

[guiodic]

I am going to revert it, but I wonder if I should revert 86b1877 as well.

I presume the bug can be fixed without reverting [86b1877] that commit solves a worse bug. I will try tomorrow.

I reproduce it with a command line like: melt -profile atsc_1080p_25 color:white -track /path/to.png -attach affine transition.rect=25%,25%,50%,50% -transition qtblend The PNG I am using is 512x512, less than 1920x1080.

Good, I will test a couple of ideas.