[FFmpeg-trac] #187(undetermined:reopened): 3GP/MP4 performance regression

FFmpeg trac at avcodec.org
Mon Jun 3 20:00:33 CEST 2013


#187: 3GP/MP4 performance regression
-------------------------------------+-------------------------------------
             Reporter:  jsd          |                    Owner:
                 Type:  defect       |                   Status:  reopened
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:  mov          |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------
Changes (by lars):

 * status:  closed => reopened
 * resolution:  worksforme =>


Comment:

 I guess I have the same problem: When I run below ffmpeg command it takes
 very long time and the output file is about 10 times bigger. If I provide
 the frame rate parameter -r it works well (small file, fast transcoding).
 What is the problem and how can I solve it? I don't want to set a fixed
 frame rate because I guess it's better to leave it the same as source,
 isn't it?.

 Maybe the problem is something else, because I found many examples in web
 where the -r option isn't used. Also transcoding to a different format or
 with a different source works well without -r option (I tried with ffmpeg
 0.7.15 and also 1.2.1). The videos are provided by the users of my website
 and automatically converted to be suitable for the web. So I need the most
 general command for automatic conversion.

 In the following ffmpeg output you will find this two suspicious messages:

 * Frame rate very high for a muxer not effciciently supporting it. Please
 consider specifiying a lower framerate, a different muxer or -vsync 2
 * MB rate (36000000) > level limit (983040)

 '''ffmpeg command + log':''
     ffmpeg -i '/tmp/standort_aquarium.mp4' -vcodec libx264 output.mp4
     ffmpeg version 0.7.15, Copyright (c) 2000-2013 the FFmpeg developers
 built on Feb 22 2013 07:18:58 with gcc 4.4.5  configuration: --enable-
 libdc1394 --prefix=/usr --extra-cflags='-Wall -g ' --cc='ccache cc'
 --enable-shared --enable-libmp3lame --enable-gpl --enable-libvorbis
 --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc
 --enable-x11grab --enable-libgsm --enable-libtheora --enable-libopencore-
 amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libspeex
 --enable-nonfree --disable-stripping --enable-avfilter --enable-libdirac
 --disable-decoder=libdirac --enable-libfreetype --enable-libschroedinger
 --disable-encoder=libschroedinger --enable-version3 --enable-libopenjpeg
 --enable-libvpx --enable-librtmp --extra-libs=-lgcrypt --disable-altivec
 --disable-armv5te --disable-armv6 --disable-vis
       libavutil    50. 43. 0 / 50. 43. 0
       libavcodec   52.123. 0 / 52.123. 0
       libavformat  52.111. 0 / 52.111. 0
       libavdevice  52.  5. 0 / 52.  5. 0
       libavfilter   1. 80. 0 /  1. 80. 0
       libswscale    0. 14. 1 /  0. 14. 1
       libpostproc  51.  2. 0 / 51.  2. 0
     Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/tmp/standort_aquarium.mp4':
       Metadata:
         major_brand     : mp42
         minor_version   : 0
         compatible_brands: mp423gp4isom
         creation_time   : 2013-04-19 15:04:05
       Duration: 00:00:18.24, start: 0.000000, bitrate: 2095 kb/s
         Stream #0.0(und): Video: mpeg4, yuv420p, 640x480 [PAR 1:1 DAR
 4:3], 2001 kb/s, 14.97 fps, 30k tbr, 30k tbn, 30k tbc
         Metadata:
           creation_time   : 2013-04-19 15:04:05
         Stream #0.1(und): Audio: aac, 48000 Hz, mono, s16, 96 kb/s
         Metadata:
           creation_time   : 2013-04-19 15:04:05
     File 'output.mp4' already exists. Overwrite ? [y/N] y
     [mp4 @ 0x20eed80] Frame rate very high for a muxer not effciciently
 supporting it.
     Please consider specifiying a lower framerate, a different muxer or
 -vsync 2
     [buffer @ 0x20f8820] w:640 h:480 pixfmt:yuv420p tb:1/1000000 sar:1/1
 sws_param:
     [libx264 @ 0x20efde0] Default settings detected, using medium profile
     [libx264 @ 0x20efde0] using SAR=1/1
     [libx264 @ 0x20efde0] MB rate (36000000) > level limit (983040)
     [libx264 @ 0x20efde0] using cpu capabilities: MMX2 SSE2Fast SSSE3
 FastShuffle SSE4.2
     [libx264 @ 0x20efde0] profile High, level 5.1
     [libx264 @ 0x20efde0] 264 - core 118 - H.264/MPEG-4 AVC codec -
 Copyleft 2003-2011 - 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=1
 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=25 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, mp4, to 'output.mp4':
       Metadata:
         major_brand     : mp42
         minor_version   : 0
         compatible_brands: mp423gp4isom
         creation_time   : 2013-04-19 15:04:05
         encoder         : Lavf52.111.0
         Stream #0.0(und): Video: libx264, yuv420p, 640x480 [PAR 1:1 DAR
 4:3], q=2-31, 200 kb/s, 30k tbn, 30k tbc
         Metadata:
           creation_time   : 2013-04-19 15:04:05
         Stream #0.1(und): Audio: libfaac, 48000 Hz, mono, s16, 64 kb/s
         Metadata:
           creation_time   : 2013-04-19 15:04:05
     Stream mapping:
       Stream #0.0 -> #0.0
       Stream #0.1 -> #0.1
     Press [q] to stop, [?] for help
     frame=542630 fps=132 q=33.0 Lsize=   77226kB time=00:00:18.08
 bitrate=34976.2kbits/s dup=542358 drop=0
     video:68604kB audio:143kB global headers:0kB muxing overhead
 12.333275%
     frame I:2174  Avg QP:18.72  size: 25040
     [libx264 @ 0x20efde0] frame P:136846 Avg QP:25.27  size:    56
     [libx264 @ 0x20efde0] frame B:403610 Avg QP:32.99  size:    20
     [libx264 @ 0x20efde0] consecutive B-frames:  0.8%  0.0%  0.1% 99.1%
     [libx264 @ 0x20efde0] mb I  I16..4:  5.5% 83.3% 11.1%
     [libx264 @ 0x20efde0] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  0.5%
 0.0%  0.0%  0.0%  0.0%    skip:99.4%
     [libx264 @ 0x20efde0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.0%
 0.0%  0.0%  direct: 0.0%  skip:100.0%  L0:21.2% L1:78.8% BI: 0.0%
     [libx264 @ 0x20efde0] 8x8 transform intra:83.1% inter:85.2%
     [libx264 @ 0x20efde0] coded y,uvDC,uvAC intra: 91.2% 95.8% 80.7%
 inter: 0.0% 0.1% 0.0%
     [libx264 @ 0x20efde0] i16 v,h,dc,p: 13% 40% 12% 35%
     [libx264 @ 0x20efde0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 34% 15%  4%
 4%  5%  6%  7%  8%
     [libx264 @ 0x20efde0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 38%  6%  4%
 6%  6%  8%  6%  6%
     [libx264 @ 0x20efde0] i8c dc,h,v,p: 39% 32% 19% 10%
     [libx264 @ 0x20efde0] Weighted P-Frames: Y:0.0% UV:0.0%
     [libx264 @ 0x20efde0] ref P L0: 91.5%  5.2%  2.8%  0.4%  0.0%
     [libx264 @ 0x20efde0] ref B L0: 55.7% 43.5%  0.8%
     [libx264 @ 0x20efde0] ref B L1: 97.9%  2.1%
     [libx264 @ 0x20efde0] kb/s:31071.04

 see: http://stackoverflow.com/questions/16818930/problems-with-frame-rate-
 on-video-conversion-using-ffmpeg-with-libx264?noredirect=1

 The video source is temporarily available under:
 https://www.dropbox.com/s/4xg147z77u40g87/standort_aquarium.mp4

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/187#comment:10>
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