Thomas Mundt a7f6bfdc18 avfilter/interlace: prevent over-sharpening with the complex low-pass filter ... The complex vertical low-pass filter slightly over-sharpens the picture. This becomes visible when several transcodings are cascaded and the error potentises, e.g. some generations of HD->SD SD->HD. To prevent this behaviour the destination pixel must not exceed the source pixel when the average of the pixels above and below is less than the source pixel. And the other way around. Tested and approved in a visual transcoding cascade test by video professionals. SSIM/PSNR test with the first generation of an HD->SD file as a reference against the 6th generation(3 x SD->HD HD->SD): Results without the patch: SSIM Y:0.956508 (13.615881) U:0.991601 (20.757750) V:0.993004 (21.551382) All:0.974405 (15.918463) PSNR y:31.838009 u:48.424280 v:48.962711 average:34.759466 min:31.699297 max:40.857847 Results with the patch: SSIM Y:0.970051 (15.236232) U:0.991883 (20.905857) V:0.993174 (21.658049) All:0.981290 (17.279202) PSNR y:34.412108 u:48.504454 v:48.969496 average:37.264644 min:34.310637 max:42.373392 Signed-off-by: Thomas Mundt <tmundt75@gmail.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>		2017-09-15 22:40:21 +02:00
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acodec	swresample/options: enable linear_interp and exact_rational by default	2017-03-17 00:08:03 +07:00
fate	avfilter/interlace: prevent over-sharpening with the complex low-pass filter	2017-09-15 22:40:21 +02:00
lavf	avformat/mxfenc: Correct the Sample rate for PCM outside D10	2017-09-12 19:24:25 +02:00
lavf-fate
seek	avformat/mov: Fix trampling of ctts during seeks when sidx support is enabled.	2017-08-24 11:02:22 +02:00
vsynth	avcodec/dvenc: Change quantizer dead zone default to 7	2017-08-08 19:39:21 +02:00
vsynth1
vsynth_lena