ons 2019-02-20 klockan 22:12 +0100 skrev Michael Niedermayer: > On Sat, Feb 09, 2019 at 01:10:20PM +0000, Matthew Fearnley wrote: > > - Improve block choices by counting 0-bytes in the entropy score > > - Make histogram use uint16_t type, to allow byte counts from 16*16 > > (current block size) up to 255*255 (maximum allowed 8bpp block size) > > - Make sure score table is big enough for a full block's worth of bytes > > - Calculate *xored without using code in inner loop > > This should have been split into multiple changes
Alas > compression seems to become slightly worse from this change > > ./ffmpeg -i matrixbench_mpeg2.mpg -vframes 30 -vcodec zmbv -an -y test-old.avi > ./ffmpeg -i matrixbench_mpeg2.mpg -vframes 30 -vcodec zmbv -an -y test-new.avi > > -rw-r----- 1 michael michael 1175466 Feb 20 22:06 test-new.avi > -rw-r----- 1 michael michael 1174832 Feb 20 22:07 test-old.avi A whopping 0.05% change, with an MPEG source rather than the intended PAL8.. The flip side here is that we can now use larger block sizes and higher me_range without crashing the encoder. We can add a slower mode that tests a few different block sizes to see which one results in the smallest output. /Tomas _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
