On Fri, Apr 24, 2015 at 12:03:38AM +0800, Yingming Fan wrote: > Hi, everyone. > > This is my GSoC qualification task, add simple P frame for ffv1. > > P frame will work when you add -level 4. > > eg. ffmpeg -pix_fmt yuv420p -s xxxx -i xx.yuv -vcodec ffv1 -level 4 test.nut > > Notice: Only support yuv colorspace and 8 bit currently, i will support > these in later time. > > Other option about ffv1 can be find here: > http://trac.ffmpeg.org/wiki/Encode/FFV1 > > About test. > > I haven't send FATE result to server as i'm not that familiar with those > staff. But i will complete this as soon as possible. > > Best regards
> ffv1.c | 10 +++++++ > ffv1.h | 1 > ffv1dec.c | 54 +++++++++++++++++++++++++++++--------- > ffv1enc.c | 87 > ++++++++++++++++++++++++++++++++++++++++++++++++++------------ > 4 files changed, 124 insertions(+), 28 deletions(-) > 56a6b95f90706b65b833f1a359c08f927fdc1124 > 0001-Add-simple-P-frame-support-for-ffv1.patch > From 5fcc87093ce1f2aea3a43b52399b09fdf8acda36 Mon Sep 17 00:00:00 2001 > From: Yingming Fan <yingming...@gmail.com> > Date: Thu, 23 Apr 2015 23:19:05 +0800 > Subject: [PATCH] Add simple P frame support for ffv1. breaks ffv1 with normal intra frames: ./ffmpeg -i matrixbench_mpeg2.mpg -vf format=gbrp10 -vcodec ffv1 -t 1 test.avi just segfaults ./ffmpeg -i matrixbench_mpeg2.mpg -vcodec ffv1 -level 3 -t 1 test-3.nut ./ffmpeg -i matrixbench_mpeg2.mpg -vcodec ffv1 -level 4 -t 1 test-4.nut -rw-r----- 1 michael michael 2325508 Apr 23 18:24 test-3.nut -rw-r----- 1 michael michael 3394282 Apr 23 18:24 test-4.nut the file with P frames is 50% bigger, thats not a good start, considering the goal is to improve compression of the currently existing FFV1 [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Asymptotically faster algorithms should always be preferred if you have asymptotical amounts of data
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