Opened 13 years ago

Closed 13 years ago

#3161 closed defect (worksforme)

libvpx crf does nothing

Reported by: Linus Kardell Owned by:
Priority: normal Component: undetermined
Version: 2.0.2 Keywords: libvpx
Cc: Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no

Description

When encoding with libvpx "crf" does not seem to change the quality or bitrate, for example "-crf 4" and "-crf 63" gives almost exactly the same output.

Attachments (2)

Big Buck Bunny 4.webm​ (779.3 KB ) - added by Linus Kardell 13 years ago.
crf=4
Big Buck Bunny 63.webm​ (778.2 KB ) - added by Linus Kardell 13 years ago.
crf=63

Download all attachments as: .zip

Change History (5)

comment:1 by llogan, 13 years ago

To make this a valid ticket please include your actual ffmpeg command and the complete console output. Also include any input files if necessary and all other required information so anyone can attempt to duplicate the issue.

comment:2 by Linus Kardell, 13 years ago

crf=4:

> ffmpeg -i Big\ Buck\ Bunny.mkv -t 15 -an -vcodec libvpx -crf 4 Big\ Buck\ Bunny\ 4.webm
ffmpeg version 2.0.2 Copyright (c) 2000-2013 the FFmpeg developers
  built on Oct 19 2013 08:34:03 with gcc 4.7 (SUSE Linux)
  configuration: --shlibdir=/usr/lib64 --prefix=/usr --mandir=/usr/share/man --libdir=/usr/lib64 --enable-shared --disable-static --enable-debug --disable-stripping --extra-cflags='-fmessage-length=0 -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables -g -fPIC -I/usr/include/gsm' --enable-gpl --enable-x11grab --enable-version3 --enable-pthreads --enable-avfilter --enable-libpulse --enable-libvpx --enable-libopus --enable-libass --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libspeex --enable-libxvid --enable-libx264 --enable-libschroedinger --enable-libgsm --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-postproc --enable-libdc1394 --enable-librtmp --enable-libfreetype --enable-avresample --enable-libtwolame --enable-libvo-aacenc
  libavutil      52. 38.100 / 52. 38.100
  libavcodec     55. 18.102 / 55. 18.102
  libavformat    55. 12.100 / 55. 12.100
  libavdevice    55.  3.100 / 55.  3.100
  libavfilter     3. 79.101 /  3. 79.101
  libavresample   1.  1.  0 /  1.  1.  0
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
Input #0, matroska,webm, from 'Big Buck Bunny.mkv':
  Metadata:
    ENCODER         : Lavf55.12.100
  Duration: 00:09:56.46, start: 0.000000, bitrate: 309088 kb/s
    Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), bgr0, 1920x1080, SAR 1:1 DAR 16:9, 24 fps, 24 tbr, 1k tbn, 1k tbc (default)
    Stream #0:1: Audio: flac, 48000 Hz, 5.1(side), s32 (default)
[libvpx @ 0x1eac7a0] v1.1.0
Output #0, webm, to 'Big Buck Bunny 4.webm':
  Metadata:
    encoder         : Lavf55.12.100
    Stream #0:0: Video: vp8 (libvpx), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 200 kb/s, 1k tbn, 24 tbc (default)
Stream mapping:
  Stream #0:0 -> #0:0 (ffv1 -> libvpx)
Press [q] to stop, [?] for help
frame=  360 fps=6.7 q=0.0 Lsize=     779kB time=00:00:15.00 bitrate= 425.6kbits/s    
video:776kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.394523%

crf=63:

> ffmpeg -i Big\ Buck\ Bunny.mkv -t 15 -an -vcodec libvpx -crf 63 Big\ Buck\ Bunny\ 63.webm
ffmpeg version 2.0.2 Copyright (c) 2000-2013 the FFmpeg developers
  built on Oct 19 2013 08:34:03 with gcc 4.7 (SUSE Linux)
  configuration: --shlibdir=/usr/lib64 --prefix=/usr --mandir=/usr/share/man --libdir=/usr/lib64 --enable-shared --disable-static --enable-debug --disable-stripping --extra-cflags='-fmessage-length=0 -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables -g -fPIC -I/usr/include/gsm' --enable-gpl --enable-x11grab --enable-version3 --enable-pthreads --enable-avfilter --enable-libpulse --enable-libvpx --enable-libopus --enable-libass --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libspeex --enable-libxvid --enable-libx264 --enable-libschroedinger --enable-libgsm --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-postproc --enable-libdc1394 --enable-librtmp --enable-libfreetype --enable-avresample --enable-libtwolame --enable-libvo-aacenc
  libavutil      52. 38.100 / 52. 38.100
  libavcodec     55. 18.102 / 55. 18.102
  libavformat    55. 12.100 / 55. 12.100
  libavdevice    55.  3.100 / 55.  3.100
  libavfilter     3. 79.101 /  3. 79.101
  libavresample   1.  1.  0 /  1.  1.  0
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
Input #0, matroska,webm, from 'Big Buck Bunny.mkv':
  Metadata:
    ENCODER         : Lavf55.12.100
  Duration: 00:09:56.46, start: 0.000000, bitrate: 309088 kb/s
    Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), bgr0, 1920x1080, SAR 1:1 DAR 16:9, 24 fps, 24 tbr, 1k tbn, 1k tbc (default)
    Stream #0:1: Audio: flac, 48000 Hz, 5.1(side), s32 (default)
[libvpx @ 0x16087a0] v1.1.0
Output #0, webm, to 'Big Buck Bunny 63.webm':
  Metadata:
    encoder         : Lavf55.12.100
    Stream #0:0: Video: vp8 (libvpx), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 200 kb/s, 1k tbn, 24 tbc (default)
Stream mapping:
  Stream #0:0 -> #0:0 (ffv1 -> libvpx)
Press [q] to stop, [?] for help
frame=  360 fps=6.8 q=0.0 Lsize=     778kB time=00:00:15.00 bitrate= 425.0kbits/s    
video:775kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.391042%

by Linus Kardell, 13 years ago

Attachment: Big Buck Bunny 4.webm​ added

crf=4

by Linus Kardell, 13 years ago

Attachment: Big Buck Bunny 63.webm​ added

crf=63

comment:3 by Carl Eugen Hoyos, 13 years ago

Component: FFmpeg → undetermined
Keywords: crf removed
Resolution: → worksforme
Status: new → closed

For future tickets: Please always test current FFmpeg as explained on ​http://ffmpeg.org/bugreports.html

$ ffmpeg -f lavfi -i testsrc -crf 4 -t 15 4.webm
ffmpeg version 2.0.2 Copyright (c) 2000-2013 the FFmpeg developers
  built on Dec  9 2013 11:02:30 with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl --enable-libvpx
  libavutil      52. 38.100 / 52. 38.100
  libavcodec     55. 18.102 / 55. 18.102
  libavformat    55. 12.100 / 55. 12.100
  libavdevice    55.  3.100 / 55.  3.100
  libavfilter     3. 79.101 /  3. 79.101
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
Input #0, lavfi, from 'testsrc':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 320x240 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
[libvpx @ 0x36147a0] v1.2.0
Output #0, webm, to '4.webm':
  Metadata:
    encoder         : Lavf55.12.100
    Stream #0:0: Video: vp8 (libvpx), yuv420p, 320x240 [SAR 1:1 DAR 4:3], q=-1--1, 200 kb/s, 1k tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo -> libvpx)
Press [q] to stop, [?] for help
frame=  375 fps=0.0 q=0.0 Lsize=     261kB time=00:00:15.00 bitrate= 142.4kbits/s
video:258kB audio:0kB subtitle:0 global headers:0kB muxing overhead 1.199901%

$ ffmpeg -f lavfi -i testsrc -crf 63 -t 15 63.webm
ffmpeg version 2.0.2 Copyright (c) 2000-2013 the FFmpeg developers
  built on Dec  9 2013 11:02:30 with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl --enable-libvpx
  libavutil      52. 38.100 / 52. 38.100
  libavcodec     55. 18.102 / 55. 18.102
  libavformat    55. 12.100 / 55. 12.100
  libavdevice    55.  3.100 / 55.  3.100
  libavfilter     3. 79.101 /  3. 79.101
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
Input #0, lavfi, from 'testsrc':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 320x240 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
[libvpx @ 0x22f87a0] v1.2.0
Output #0, webm, to '63.webm':
  Metadata:
    encoder         : Lavf55.12.100
    Stream #0:0: Video: vp8 (libvpx), yuv420p, 320x240 [SAR 1:1 DAR 4:3], q=-1--1, 200 kb/s, 1k tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo -> libvpx)
Press [q] to stop, [?] for help
frame=  375 fps=0.0 q=0.0 Lsize=      75kB time=00:00:15.00 bitrate=  40.9kbits/s
video:72kB audio:0kB subtitle:0 global headers:0kB muxing overhead 3.847820%
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