X265

[Qyot27]

Hey
Since 09.03.2014 version ffmpeg included libx265 but crf doesn't work command line

ffmpeg.exe -i video.mkv -vcodec libx265 -preset veryslow -b:crf 24 video265.mp4

bitrate always too low about 400kb and doesnt deppend crf=20 crf=26 still bitrate and size the same

-x265-params crf=18

Code: Select all

>ffmpeg -i test.avs -vcodec libx265 -preset ultrafast -x265-params crf=18 test.mkv
ffmpeg version r65795 git-e9feeae Copyright (c) 2000-2014 the FFmpeg developers
  built on Aug 20 2014 17:40:56 with gcc 4.9.1 (GCC)
  libavutil      54.  5.100 / 54.  5.100
  libavcodec     56.  0.101 / 56.  0.101
  libavformat    56.  1.100 / 56.  1.100
  libavdevice    56.  0.100 / 56.  0.100
  libavfilter     5.  0.101 /  5.  0.101
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  0.100 /  3.  0.100
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  0.100 / 53.  0.100
Input #0, avisynth, from 'test.avs':
  Duration: 00:00:10.00, start: 0.000000, bitrate: 0 kb/s
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 440x80, 24 fps, 24 tbr, 24 tbn, 24 tbc
File 'test.mkv' already exists. Overwrite ? [y/N] y
x265 [info]: HEVC encoder version 1.2+575-80129b1b6260
x265 [info]: build info [Windows][GCC 4.9.1][32 bit] 8bpp
x265 [info]: using cpu capabilities: MMX2 SSE Cache32
x265 [info]: Parallelism disabled, single thread mode
x265 [info]: Main profile, Level-2 (Main tier)
x265 [info]: CU size                             : 32
x265 [info]: Max RQT depth inter / intra         : 1 / 1
x265 [info]: ME / range / subpel / merge         : dia / 25 / 0 / 2
x265 [info]: Keyframe min / max / scenecut       : 24 / 250 / 0
x265 [info]: Lookahead / bframes / badapt        : 10 / 4 / 0
x265 [info]: b-pyramid / weightp / weightb / refs: 1 / 0 / 0 / 1
x265 [info]: Rate Control / AQ-Strength / CUTree : CRF-18.0 / 0.0 / 0
x265 [info]: tools: cfm esd rd=2 fast-intra
Output #0, matroska, to 'test.mkv':
  Metadata:
    encoder         : Lavf56.1.100
    Stream #0:0: Video: hevc (libx265), yuv420p, 440x80, q=2-31, 200 kb/s, 24 fps, 1k tbn, 24 tbc
    Metadata:
      encoder         : Lavc56.0.101 libx265
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> hevc (libx265))
Press [q] to stop, [?] for help
frame=  240 fps= 13 q=0.0 Lsize=      29kB time=00:00:09.91 bitrate=  23.6kbits/s
video:26kB audio:0kB subtitle:0kB other streams:0kB global headers:1kB muxing overhead: 11.501597%
x265 [info]: frame I:      1, Avg QP:15.09  kb/s: 2689.73
x265 [info]: frame P:     48, Avg QP:7.21  kb/s: 29.55
x265 [info]: frame B:    191, Avg QP:9.40  kb/s: 3.95
x265 [info]: global :    240, Avg QP:8.99  kb/s: 20.26
x265 [info]: consecutive B-frames: 2.0% 0.0% 0.0% 2.0% 95.9%

[jakkor]

Good work
I don't use input avs my input is mkv. But if i set output mp4 instead mkv size file is largest the output mkv with the same parameters. Which output is better?

[Qyot27]

It was an example. The only important thing about it was showing that passing crf to -x265-params actually does something.