[FFmpeg-user] frame rate change is too slow
Elliott Balsley
elliottbalsley at gmail.com
Wed Apr 2 10:03:30 CEST 2014
I have a video shot at 96fps with a 23.98 timebase (so it's in slow
motion). I want to make it play at normal speed, by dropping 3 out of
every 4 frames. I would expect this to encode 4x faster, but it
actually takes about twice as long as a normal encode. I'm using the
-r flag twice; is there a better way?
$ ffmpeg -ss 60 -t 10 -i
/Volumes/RAID/GILT/Raw_Footage/Day07/A045R1NA/A045C001_140402_R1NA.mov
-pix_fmt yuv420p -r 24000/1001 test.mov
ffmpeg version 2.1.git-ffb7d71 Copyright (c) 2000-2014 the FFmpeg developers
built on Mar 7 2014 16:54:41 with Apple LLVM version 5.0
(clang-500.2.79) (based on LLVM 3.3svn)
configuration: --prefix=/opt/local --enable-swscale
--enable-avfilter --enable-avresample --enable-libmp3lame
--enable-libvorbis --enable-libopus --enable-libtheora
--enable-libschroedinger --enable-libopenjpeg --enable-libmodplug
--enable-libvpx --enable-libspeex --enable-libass --enable-libbluray
--enable-gnutls --enable-fontconfig --enable-libfreetype
--disable-indev=jack --disable-outdev=xv --mandir=/opt/local/share/man
--enable-shared --enable-pthreads --cc=/usr/bin/cc --arch=x86_64
--enable-yasm --enable-gpl --enable-postproc --enable-libx264
--enable-libxvid --enable-nonfree --enable-libfdk-aac --enable-libfaac
libavutil 52. 66.100 / 52. 66.100
libavcodec 55. 52.102 / 55. 52.102
libavformat 55. 33.100 / 55. 33.100
libavdevice 55. 10.100 / 55. 10.100
libavfilter 4. 2.100 / 4. 2.100
libavresample 1. 2. 0 / 1. 2. 0
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 18.100 / 0. 18.100
libpostproc 52. 3.100 / 52. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
'/Volumes/RAID/GILT/Raw_Footage/Day07/A045R1NA/A045C001_140402_R1NA.mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt ARRI
creation_time : 2014-04-02 04:27:44
timecode : 00:01:33:13
Duration: 00:06:13.71, start: 0.000000, bitrate: 190892 kb/s
Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le,
1920x1080, 183719 kb/s, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 23976
tbn, 23976 tbc (default)
Metadata:
creation_time : 2014-04-02 04:27:44
handler_name : Apple Alias Data Handler
Stream #0:1(eng): Data: none (tmcd / 0x64636D74) (default)
Metadata:
creation_time : 2014-04-02 04:27:44
handler_name : Apple Alias Data Handler
timecode : 00:01:33:13
File 'test.mov' already exists. Overwrite ? [y/N] y
[libx264 @ 0x7fb913852c00] using SAR=1/1
[libx264 @ 0x7fb913852c00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
[libx264 @ 0x7fb913852c00] profile High, level 4.0
[libx264 @ 0x7fb913852c00] 264 - core 142 - H.264/MPEG-4 AVC codec -
Copyleft 2003-2014 - http://www.videolan.org/x264.html - options:
cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1
psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1
8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2
threads=36 lookahead_threads=6 sliced_threads=0 nr=0 decimate=1
interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2
b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250
keyint_min=23 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf
mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40
aq=1:1.00
Output #0, mov, to 'test.mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt ARRI
timecode : 00:01:33:13
encoder : Lavf55.33.100
Stream #0:0(eng): Video: h264 (libx264) (avc1 / 0x31637661),
yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 24k tbn, 23.98 tbc
(default)
Metadata:
creation_time : 2014-04-02 04:27:44
handler_name : Apple Alias Data Handler
Stream mapping:
Stream #0:0 -> #0:0 (prores -> libx264)
Press [q] to stop, [?] for help
frame= 240 fps= 35 q=-1.0 Lsize= 4459kB time=00:00:09.92
bitrate=3680.1kbits/s
video:4455kB audio:0kB subtitle:0 data:0 global headers:0kB muxing
overhead 0.092370%
[libx264 @ 0x7fb913852c00] frame I:2 Avg QP:21.98 size:102144
[libx264 @ 0x7fb913852c00] frame P:100 Avg QP:24.07 size: 27494
[libx264 @ 0x7fb913852c00] frame B:138 Avg QP:25.37 size: 11650
[libx264 @ 0x7fb913852c00] consecutive B-frames: 11.2% 31.7% 13.8% 43.3%
[libx264 @ 0x7fb913852c00] mb I I16..4: 9.3% 71.6% 19.1%
[libx264 @ 0x7fb913852c00] mb P I16..4: 1.0% 6.6% 1.0% P16..4:
51.9% 7.9% 5.7% 0.0% 0.0% skip:25.8%
[libx264 @ 0x7fb913852c00] mb B I16..4: 0.4% 2.3% 0.5% B16..8:
38.3% 1.7% 0.2% direct: 4.2% skip:52.4% L0:46.9% L1:51.7% BI:
1.4%
[libx264 @ 0x7fb913852c00] 8x8 transform intra:74.2% inter:84.8%
[libx264 @ 0x7fb913852c00] coded y,uvDC,uvAC intra: 60.9% 55.0% 19.4%
inter: 16.9% 25.1% 0.6%
[libx264 @ 0x7fb913852c00] i16 v,h,dc,p: 20% 21% 6% 52%
[libx264 @ 0x7fb913852c00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 15% 15%
7% 8% 10% 9% 8% 8%
[libx264 @ 0x7fb913852c00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 29% 17% 13%
7% 8% 10% 7% 6% 4%
[libx264 @ 0x7fb913852c00] i8c dc,h,v,p: 60% 17% 19% 4%
[libx264 @ 0x7fb913852c00] Weighted P-Frames: Y:23.0% UV:17.0%
[libx264 @ 0x7fb913852c00] ref P L0: 43.6% 14.8% 26.0% 12.3% 3.3%
[libx264 @ 0x7fb913852c00] ref B L0: 74.4% 21.5% 4.2%
[libx264 @ 0x7fb913852c00] ref B L1: 92.2% 7.8%
[libx264 @ 0x7fb913852c00] kb/s:3645.46
$ ffmpeg -r 96000/1001 -ss 60 -t 10 -i
/Volumes/RAID/GILT/Raw_Footage/Day07/A045R1NA/A045C001_140402_R1NA.mov
-pix_fmt yuv420p -r 24000/1001 test.mov
ffmpeg version 2.1.git-ffb7d71 Copyright (c) 2000-2014 the FFmpeg developers
built on Mar 7 2014 16:54:41 with Apple LLVM version 5.0
(clang-500.2.79) (based on LLVM 3.3svn)
configuration: --prefix=/opt/local --enable-swscale
--enable-avfilter --enable-avresample --enable-libmp3lame
--enable-libvorbis --enable-libopus --enable-libtheora
--enable-libschroedinger --enable-libopenjpeg --enable-libmodplug
--enable-libvpx --enable-libspeex --enable-libass --enable-libbluray
--enable-gnutls --enable-fontconfig --enable-libfreetype
--disable-indev=jack --disable-outdev=xv --mandir=/opt/local/share/man
--enable-shared --enable-pthreads --cc=/usr/bin/cc --arch=x86_64
--enable-yasm --enable-gpl --enable-postproc --enable-libx264
--enable-libxvid --enable-nonfree --enable-libfdk-aac --enable-libfaac
libavutil 52. 66.100 / 52. 66.100
libavcodec 55. 52.102 / 55. 52.102
libavformat 55. 33.100 / 55. 33.100
libavdevice 55. 10.100 / 55. 10.100
libavfilter 4. 2.100 / 4. 2.100
libavresample 1. 2. 0 / 1. 2. 0
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 18.100 / 0. 18.100
libpostproc 52. 3.100 / 52. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
'/Volumes/RAID/GILT/Raw_Footage/Day07/A045R1NA/A045C001_140402_R1NA.mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt ARRI
creation_time : 2014-04-02 04:27:44
timecode : 00:01:33:13
Duration: 00:06:13.71, start: 0.000000, bitrate: 190892 kb/s
Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le,
1920x1080, 183719 kb/s, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 23976
tbn, 23976 tbc (default)
Metadata:
creation_time : 2014-04-02 04:27:44
handler_name : Apple Alias Data Handler
Stream #0:1(eng): Data: none (tmcd / 0x64636D74) (default)
Metadata:
creation_time : 2014-04-02 04:27:44
handler_name : Apple Alias Data Handler
timecode : 00:01:33:13
[libx264 @ 0x7fa2d0852c00] using SAR=1/1
[libx264 @ 0x7fa2d0852c00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
[libx264 @ 0x7fa2d0852c00] profile High, level 4.0
[libx264 @ 0x7fa2d0852c00] 264 - core 142 - H.264/MPEG-4 AVC codec -
Copyleft 2003-2014 - http://www.videolan.org/x264.html - options:
cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1
psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1
8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2
threads=36 lookahead_threads=6 sliced_threads=0 nr=0 decimate=1
interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2
b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250
keyint_min=23 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf
mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40
aq=1:1.00
Output #0, mov, to 'test.mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt ARRI
timecode : 00:01:33:13
encoder : Lavf55.33.100
Stream #0:0(eng): Video: h264 (libx264) (avc1 / 0x31637661),
yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 24k tbn, 23.98 tbc
(default)
Metadata:
creation_time : 2014-04-02 04:27:44
handler_name : Apple Alias Data Handler
Stream mapping:
Stream #0:0 -> #0:0 (prores -> libx264)
Press [q] to stop, [?] for help
frame= 243 fps= 16 q=-1.0 Lsize= 6151kB time=00:00:10.05
bitrate=5013.1kbits/s dup=0 drop=716
video:6147kB audio:0kB subtitle:0 data:0 global headers:0kB muxing
overhead 0.067901%
[libx264 @ 0x7fa2d0852c00] frame I:2 Avg QP:22.64 size: 86343
[libx264 @ 0x7fa2d0852c00] frame P:126 Avg QP:24.43 size: 31866
[libx264 @ 0x7fa2d0852c00] frame B:115 Avg QP:25.70 size: 18313
[libx264 @ 0x7fa2d0852c00] consecutive B-frames: 12.3% 70.0% 11.1% 6.6%
[libx264 @ 0x7fa2d0852c00] mb I I16..4: 9.0% 72.2% 18.7%
[libx264 @ 0x7fa2d0852c00] mb P I16..4: 1.2% 7.4% 1.1% P16..4:
54.8% 9.5% 5.8% 0.0% 0.0% skip:20.2%
[libx264 @ 0x7fa2d0852c00] mb B I16..4: 0.9% 5.0% 0.8% B16..8:
37.9% 3.1% 0.5% direct: 8.1% skip:43.6% L0:46.5% L1:50.8% BI:
2.8%
[libx264 @ 0x7fa2d0852c00] 8x8 transform intra:75.4% inter:82.9%
[libx264 @ 0x7fa2d0852c00] coded y,uvDC,uvAC intra: 60.5% 55.6% 19.7%
inter: 22.0% 36.6% 0.8%
[libx264 @ 0x7fa2d0852c00] i16 v,h,dc,p: 16% 22% 5% 56%
[libx264 @ 0x7fa2d0852c00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 16% 15%
7% 8% 10% 9% 8% 9%
[libx264 @ 0x7fa2d0852c00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 17% 14%
7% 8% 10% 7% 6% 4%
[libx264 @ 0x7fa2d0852c00] i8c dc,h,v,p: 61% 17% 19% 4%
[libx264 @ 0x7fa2d0852c00] Weighted P-Frames: Y:24.6% UV:23.0%
[libx264 @ 0x7fa2d0852c00] ref P L0: 43.6% 13.9% 21.6% 16.0% 4.9%
[libx264 @ 0x7fa2d0852c00] ref B L0: 67.7% 30.7% 1.6%
[libx264 @ 0x7fa2d0852c00] ref B L1: 96.9% 3.1%
[libx264 @ 0x7fa2d0852c00] kb/s:4967.86
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