ffmpeg/tests/filtergraphs/scale2ref_keep_aspect

sws_flags=+accurate_rnd+bitexact;
testsrc=size=320x240 [main];
testsrc=size=640x360 [ref];
[main][ref] scale2ref=iw/4:ow/mdar [main][ref];
[ref] nullsink
FATE: Add test for libavfilter/scale2ref This new FATE test for the scale2ref filter makes use of the recently added scale2ref-specific variables to maintain the aspect ratio of a test input. Filtergraph explanation: [main] has an AR of 4:3. [ref] has an AR of 16:9. 640 / 4 = 160. So the new width for [main] is 160. 160 / ((320 / 240) * (1 / 1)) = 160 / (4 / 3) = 120. So the new height for [main] is 120. 160 / 120 = 4 / 3 so [main]'s aspect ratio has been maintained while using [ref]'s width as a reference point. [ref] is nullsink'd since it is left unchanged by scale2ref (and so shouldn't need to be tested). If we were to use "iw/4:-1" in place of "iw/4:ow/mdar": 640 / 4 = 160. So the new width for [main] would be 160. 360 / 4 = 90. So the new height for [main] would be 90. 160 / 90 = 16 / 9 so [main] now has the same aspect ratio as [ref] which is probably what you do not want. This is currently the only test for scale2ref. Signed-off-by: Kevin Mark <kmark937@gmail.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc> 2017-06-04 07:53:31 +00:00			`sws_flags=+accurate_rnd+bitexact;`
			`testsrc=size=320x240 [main];`
			`testsrc=size=640x360 [ref];`
			`[main][ref] scale2ref=iw/4:ow/mdar [main][ref];`
			`[ref] nullsink`