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

11 May 2011

      #187: 3GP/MP4 performance regression
------------------------+---------------------------
Reporter:  jsd          |       Owner:
    Type:  defect       |      Status:  open
Priority:  normal       |   Component:  undetermined
 Version:  unspecified  |  Resolution:
Keywords:               |  Blocked By:
Blocking:               |  Reproduced:  0
Analyzed:  0            |
------------------------+---------------------------

Comment (by jsd):

 With this command line, it runs perfectly fine:
  ffmpeg -y -i 2423.mp4 -s 480x352 -b 300k -bt 300k test.flv

 It's fine if I add -acodec libfaac.  It's fine if I add -vcodec libx264.
 Maybe this points to the mp4 muxer being a problem?  I will spend the rest
 of the day trying to pin down where things changed.  If you think of
 anything, please update this ticket, I will be online all day.

 Here is complete uncut output with flv muxer (good):

 $ ffmpeg -y -i 2423.mp4 -s 480x352 -b 300k -bt 300k -acodec libfaac
 -vcodec libx264 test.flv
 ffmpeg version UNKNOWN, Copyright (c) 2000-2011 the FFmpeg developers
   built on May  5 2011 11:01:27 with gcc 4.1.2 20080704 (Red Hat 4.1.2-48)
   configuration: --enable-gpl --enable-libfaac --enable-libmp3lame
 --enable-libx264 --enable-pthreads --enable-static --disable-shared
 --disable-network --enable-nonfree
   libavutil    51.  2. 0 / 51.  2. 0
   libavcodec   53.  3. 0 / 53.  3. 0
   libavformat  53.  0. 3 / 53.  0. 3
   libavdevice  53.  0. 0 / 53.  0. 0
   libavfilter   2.  4. 0 /  2.  4. 0
   libswscale    0. 14. 0 /  0. 14. 0

 Seems stream 1 codec frame rate differs from container frame rate:
 60000.00 (60000/1) -> 30000.00 (60000/2)
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '2423.mp4':
   Metadata:
     major_brand     : 3gp4
     minor_version   : 768
     compatible_brands: 3gp43gp6
   Duration: 00:02:55.63, start: 0.000000, bitrate: 3493 kb/s
     Stream #0.0(eng): Audio: aac, 16000 Hz, mono, s16, 61 kb/s
     Stream #0.1(eng): Video: h264 (Baseline), yuv420p, 720x480, 3429 kb/s,
 29.83 fps, 30k tbr, 30k tbn, 60k tbc
 [buffer @ 0x8d5d5e0] w:720 h:480 pixfmt:yuv420p
 [scale @ 0x8d5c940] w:720 h:480 fmt:yuv420p -> w:480 h:352 fmt:yuv420p
 flags:0xa0000004
 [libx264 @ 0x8d5b2e0] Default settings detected, using medium profile
 [libx264 @ 0x8d5b2e0] MB rate (19800000) > level limit (983040)
 [libx264 @ 0x8d5b2e0] using cpu capabilities: MMX2 SSE2Fast SSSE3
 FastShuffle SSE4.1 Cache64
 [libx264 @ 0x8d5b2e0] profile High, level 5.1
 [libx264 @ 0x8d5b2e0] 264 - core 104 - H.264/MPEG-4 AVC codec - Copyleft
 2003-2010 - 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 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=abr mbtree=1
 bitrate=300 ratetol=1.0 qcomp=0.60 qpmin=10 qpmax=51 qpstep=4
 ip_ratio=1.40 aq=1:1.00
 Output #0, flv, to 'test.flv':
   Metadata:
     major_brand     : 3gp4
     minor_version   : 768
     compatible_brands: 3gp43gp6
     encoder         : Lavf53.0.3
     Stream #0.0(eng): Video: libx264, yuv420p, 480x352, q=2-31, 300 kb/s,
 1k tbn, 30k tbc
     Stream #0.1(eng): Audio: libfaac, 16000 Hz, mono, s16, 64 kb/s
 Stream mapping:
   Stream #0.1 -> #0.0
   Stream #0.0 -> #0.1
 Press [q] to stop encoding
 frame= 2818 fps= 32 q=29.0 Lsize=    3887kB time=94.38 bitrate=
 337.4kbits/s
 video:3480kB audio:327kB global headers:0kB muxing overhead 2.100497%
 frame I:12    Avg QP:20.98  size: 10995
 [libx264 @ 0x8d5b2e0] frame P:737   Avg QP:21.90  size:  3100
 [libx264 @ 0x8d5b2e0] frame B:2069  Avg QP:25.42  size:   554
 [libx264 @ 0x8d5b2e0] consecutive B-frames:  0.1%  2.1%  8.0% 89.8%
 [libx264 @ 0x8d5b2e0] mb I  I16..4: 18.5% 54.2% 27.3%
 [libx264 @ 0x8d5b2e0] mb P  I16..4:  1.9%  1.2%  0.2%  P16..4: 49.5% 15.9%
 9.3%  0.0%  0.0%    skip:22.0%
 [libx264 @ 0x8d5b2e0] mb B  I16..4:  0.1%  0.0%  0.0%  B16..8: 45.8%  2.1%
 0.2%  direct: 0.6%  skip:51.2%  L0:42.0% L1:54.6% BI: 3.4%
 [libx264 @ 0x8d5b2e0] final ratefactor: 23.23
 [libx264 @ 0x8d5b2e0] 8x8 transform intra:41.9% inter:69.4%
 [libx264 @ 0x8d5b2e0] coded y,uvDC,uvAC intra: 33.5% 58.4% 18.3% inter:
 7.2% 13.0% 0.1%
 [libx264 @ 0x8d5b2e0] i16 v,h,dc,p: 32% 14%  9% 44%
 [libx264 @ 0x8d5b2e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23%  9% 41%  3%  5%
 7%  4%  5%  4%
 [libx264 @ 0x8d5b2e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 36% 10% 19%  5%  7%
 9%  5%  6%  4%
 [libx264 @ 0x8d5b2e0] i8c dc,h,v,p: 61% 12% 23%  4%
 [libx264 @ 0x8d5b2e0] Weighted P-Frames: Y:0.9%
 [libx264 @ 0x8d5b2e0] ref P L0: 58.7% 10.7% 22.5%  8.0%  0.0%
 [libx264 @ 0x8d5b2e0] ref B L0: 87.6%  9.9%  2.5%
 [libx264 @ 0x8d5b2e0] ref B L1: 93.8%  6.2%
 [libx264 @ 0x8d5b2e0] kb/s:301.65

 Here is output with MP4 muxer.  Note that I aborted the encode after a few
 seconds - it's obvious it's not going to work right when you see that the
 "dup" number on the progress line is shooting up into the thousands almost
 immediately.

 $ ffmpeg -y -i 2423.mp4 -s 480x352 -b 300k -bt 300k -acodec libfaac
 -vcodec libx264 test.mp4
 ffmpeg version UNKNOWN, Copyright (c) 2000-2011 the FFmpeg developers
   built on May  5 2011 11:01:27 with gcc 4.1.2 20080704 (Red Hat 4.1.2-48)
   configuration: --enable-gpl --enable-libfaac --enable-libmp3lame
 --enable-libx264 --enable-pthreads --enable-static --disable-shared
 --disable-network --enable-nonfree
   libavutil    51.  2. 0 / 51.  2. 0
   libavcodec   53.  3. 0 / 53.  3. 0
   libavformat  53.  0. 3 / 53.  0. 3
   libavdevice  53.  0. 0 / 53.  0. 0
   libavfilter   2.  4. 0 /  2.  4. 0
   libswscale    0. 14. 0 /  0. 14. 0

 Seems stream 1 codec frame rate differs from container frame rate:
 60000.00 (60000/1) -> 30000.00 (60000/2)
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '2423.mp4':
   Metadata:
     major_brand     : 3gp4
     minor_version   : 768
     compatible_brands: 3gp43gp6
   Duration: 00:02:55.63, start: 0.000000, bitrate: 3493 kb/s
     Stream #0.0(eng): Audio: aac, 16000 Hz, mono, s16, 61 kb/s
     Stream #0.1(eng): Video: h264 (Baseline), yuv420p, 720x480, 3429 kb/s,
 29.83 fps, 30k tbr, 30k tbn, 60k tbc
 [buffer @ 0x8d5d5e0] w:720 h:480 pixfmt:yuv420p
 [scale @ 0x8d5c940] w:720 h:480 fmt:yuv420p -> w:480 h:352 fmt:yuv420p
 flags:0xa0000004
 [libx264 @ 0x8d5b2e0] Default settings detected, using medium profile
 [libx264 @ 0x8d5b2e0] MB rate (19800000) > level limit (983040)
 [libx264 @ 0x8d5b2e0] using cpu capabilities: MMX2 SSE2Fast SSSE3
 FastShuffle SSE4.1 Cache64
 [libx264 @ 0x8d5b2e0] profile High, level 5.1
 [libx264 @ 0x8d5b2e0] 264 - core 104 - H.264/MPEG-4 AVC codec - Copyleft
 2003-2010 - 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 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=abr mbtree=1
 bitrate=300 ratetol=1.0 qcomp=0.60 qpmin=10 qpmax=51 qpstep=4
 ip_ratio=1.40 aq=1:1.00
 Output #0, mp4, to 'test.mp4':
   Metadata:
     major_brand     : 3gp4
     minor_version   : 768
     compatible_brands: 3gp43gp6
     encoder         : Lavf53.0.3
     Stream #0.0(eng): Video: libx264, yuv420p, 480x352, q=2-31, 300 kb/s,
 60k tbn, 30k tbc
     Stream #0.1(eng): Audio: libfaac, 16000 Hz, mono, s16, 64 kb/s
 Stream mapping:
   Stream #0.1 -> #0.0
   Stream #0.0 -> #0.1
 Press [q] to stop encoding
 frame= 2010 fps=180 q=51.0 Lsize=      87kB time=0.07
 bitrate=10641.9kbits/s dup=2007 drop=0
 video:55kB audio:0kB global headers:0kB muxing overhead 58.719718%
 frame I:9     Avg QP:36.41  size:  2067
 [libx264 @ 0x8d5b2e0] frame P:507   Avg QP:50.98  size:    23
 [libx264 @ 0x8d5b2e0] frame B:1494  Avg QP:51.00  size:    17
 [libx264 @ 0x8d5b2e0] consecutive B-frames:  0.4%  0.0%  0.0% 99.6%
 [libx264 @ 0x8d5b2e0] mb I  I16..4: 38.8% 54.4%  6.8%
 [libx264 @ 0x8d5b2e0] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  0.1%  0.1%
 0.0%  0.0%  0.0%    skip:99.8%
 [libx264 @ 0x8d5b2e0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.1%  0.0%
 0.0%  direct: 0.0%  skip:99.9%  L0:33.9% L1:66.1% BI: 0.0%
 [libx264 @ 0x8d5b2e0] final ratefactor: 71.63
 [libx264 @ 0x8d5b2e0] 8x8 transform intra:54.3% inter:85.7%
 [libx264 @ 0x8d5b2e0] coded y,uvDC,uvAC intra: 19.9% 27.4% 3.4% inter:
 0.0% 0.0% 0.0%
 [libx264 @ 0x8d5b2e0] i16 v,h,dc,p: 54% 19%  7% 19%
 [libx264 @ 0x8d5b2e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 40%  5% 34%  4%  3%
 5%  2%  5%  2%
 [libx264 @ 0x8d5b2e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 39%  8% 25%  7%  5%
 6%  2%  6%  1%
 [libx264 @ 0x8d5b2e0] i8c dc,h,v,p: 80%  3% 16%  1%
 [libx264 @ 0x8d5b2e0] Weighted P-Frames: Y:0.0%
 [libx264 @ 0x8d5b2e0] ref P L0: 89.2%  0.5%  9.9%  0.5%
 [libx264 @ 0x8d5b2e0] ref B L0: 99.2%  0.8%
 [libx264 @ 0x8d5b2e0] kb/s:6615.40
 Received signal 2: terminating.

 Just for kicks, I tried it with .avi output and it works fine there as
 well.  It must be the mp4 muxer... I'll try to figure out what change
 caused this.  I don't really know how to use git but I guess it's time to
 learn!

-- 
Ticket URL: <http://ffmpeg.org/trac/ffmpeg/ticket/187#comment:2>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker