[FFmpeg-user] timecode_frame_start option has no effect

Werner Robitza werner.robitza at gmail.com
Thu Aug 9 10:47:20 CEST 2012 

I'm trying to cut a video starting from an exact frame position, using the
"timecode_frame_start" option.
For example, I'll use this video:
http://www.seaotter.com/marine/movies/hermit-long-01.mpg

It seems the option has no effect at all, regardless of where I put it. The
resulting video always starts at the same frame position.

Does this have to do with "max_analyze_duration"?

--------------

With encoding to x264/AAC

  % ffmpeg -i hermit-long-01.mpg -timecode_frame_start:v 200 -c:v libx264
-c:a libfaac out-cut2.mp4
ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
  built on Jul 30 2012 19:13:08 with clang 4.0 ((tags/Apple/clang-421.0.57))
  configuration: --prefix=/usr/local/Cellar/ffmpeg/0.11.1 --enable-shared
--enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables
--enable-libfreetype --cc=/usr/bin/clang --host-cflags='-Os -w -pipe
-march=native -Qunused-arguments -mmacosx-version-min=10.8'
--host-ldflags='-L/usr/local/Cellar/gettext/0.18.1.1/lib -L/usr/local/lib
-L/opt/X11/lib' --enable-libx264 --enable-libfaac --enable-libmp3lame
--enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx
--enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb
--enable-libass --enable-libvo-aacenc --disable-ffplay
  libavutil      51. 54.100 / 51. 54.100
  libavcodec     54. 23.100 / 54. 23.100
  libavformat    54.  6.100 / 54.  6.100
  libavdevice    54.  0.100 / 54.  0.100
  libavfilter     2. 77.100 /  2. 77.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
[mpegvideo @ 0x7fcef901e200] max_analyze_duration 5000000 reached at 5005000
[mpegvideo @ 0x7fcef901e200] Estimating duration from bitrate, this may be
inaccurate
Input #0, mpegvideo, from 'hermit-long-01.mpg':
  Duration: 00:00:21.47, bitrate: 2000 kb/s
    Stream #0:0: Video: mpeg1video, yuv420p, 352x240 [SAR 200:219 DAR
880:657], 2000 kb/s, 29.97 fps, 29.97 tbr, 1200k tbn, 29.97 tbc
File 'out-cut2.mp4' already exists. Overwrite ? [y/N] y
w:352 h:240 pixfmt:yuv420p tb:1/1200000 sar:200/219 sws_param:flags=2
[buffersink @ 0x7fcef8c183c0] No opaque field provided
[libx264 @ 0x7fcef9170e00] using SAR=200/219
[libx264 @ 0x7fcef9170e00] using cpu capabilities: MMX2 SSE2Fast SSSE3
FastShuffle SSE4.2 AVX
[libx264 @ 0x7fcef9170e00] profile High, level 1.3
[libx264 @ 0x7fcef9170e00] 264 - core 124 - H.264/MPEG-4 AVC codec -
Copyleft 2003-2012 - 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=12 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 'out-cut2.mp4':
  Metadata:
    encoder         : Lavf54.6.100
    Stream #0:0: Video: h264 (![0][0][0] / 0x0021), yuv420p, 352x240 [SAR
200:219 DAR 880:657], q=-1--1, 30k tbn, 29.97 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg1video -> libx264)
Press [q] to stop, [?] for help
frame=  645 fps=360 q=0.0 Lsize=    1613kB time=00:00:21.45 bitrate=
616.0kbits/s
video:1605kB audio:0kB global headers:0kB muxing overhead 0.511522%
[libx264 @ 0x7fcef9170e00] frame I:3     Avg QP:25.32  size:  9475
[libx264 @ 0x7fcef9170e00] frame P:338   Avg QP:27.28  size:  3748
[libx264 @ 0x7fcef9170e00] frame B:304   Avg QP:30.95  size:  1144
[libx264 @ 0x7fcef9170e00] consecutive B-frames:  5.7% 94.3%  0.0%  0.0%
[libx264 @ 0x7fcef9170e00] mb I  I16..4:  0.4% 86.7% 12.9%
[libx264 @ 0x7fcef9170e00] mb P  I16..4:  0.5%  8.8%  0.9%  P16..4: 39.5%
32.9% 15.0%  0.0%  0.0%    skip: 2.4%
[libx264 @ 0x7fcef9170e00] mb B  I16..4:  0.0%  0.8%  0.0%  B16..8: 45.7%
12.1%  2.9%  direct: 7.2%  skip:31.2%  L0:31.9% L1:48.6% BI:19.5%
[libx264 @ 0x7fcef9170e00] 8x8 transform intra:86.9% inter:73.0%
[libx264 @ 0x7fcef9170e00] coded y,uvDC,uvAC intra: 89.0% 63.1% 22.1%
inter: 48.0% 33.7% 3.2%
[libx264 @ 0x7fcef9170e00] i16 v,h,dc,p: 48% 33%  7% 12%
[libx264 @ 0x7fcef9170e00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 14% 18% 17%  6%
 9%  8% 10%  8% 10%
[libx264 @ 0x7fcef9170e00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 19% 12%  6%
10%  9%  9%  8%  7%
[libx264 @ 0x7fcef9170e00] i8c dc,h,v,p: 62% 17% 14%  6%
[libx264 @ 0x7fcef9170e00] Weighted P-Frames: Y:24.9% UV:8.0%
[libx264 @ 0x7fcef9170e00] ref P L0: 54.5% 28.6% 11.2%  4.8%  0.9%
[libx264 @ 0x7fcef9170e00] ref B L0: 95.0%  5.0%
[libx264 @ 0x7fcef9170e00] kb/s:610.75


With bitstream copy:

  % ffmpeg -i hermit-long-01.mpg -timecode_frame_start:v 200 -c:v copy -c:a
copy out-cut3.mpg
ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
  built on Jul 30 2012 19:13:08 with clang 4.0 ((tags/Apple/clang-421.0.57))
  configuration: --prefix=/usr/local/Cellar/ffmpeg/0.11.1 --enable-shared
--enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables
--enable-libfreetype --cc=/usr/bin/clang --host-cflags='-Os -w -pipe
-march=native -Qunused-arguments -mmacosx-version-min=10.8'
--host-ldflags='-L/usr/local/Cellar/gettext/0.18.1.1/lib -L/usr/local/lib
-L/opt/X11/lib' --enable-libx264 --enable-libfaac --enable-libmp3lame
--enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx
--enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb
--enable-libass --enable-libvo-aacenc --disable-ffplay
  libavutil      51. 54.100 / 51. 54.100
  libavcodec     54. 23.100 / 54. 23.100
  libavformat    54.  6.100 / 54.  6.100
  libavdevice    54.  0.100 / 54.  0.100
  libavfilter     2. 77.100 /  2. 77.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
[mpegvideo @ 0x7fba7881e200] max_analyze_duration 5000000 reached at 5005000
[mpegvideo @ 0x7fba7881e200] Estimating duration from bitrate, this may be
inaccurate
Input #0, mpegvideo, from 'hermit-long-01.mpg':
  Duration: 00:00:21.47, bitrate: 2000 kb/s
    Stream #0:0: Video: mpeg1video, yuv420p, 352x240 [SAR 200:219 DAR
880:657], 2000 kb/s, 29.97 fps, 29.97 tbr, 1200k tbn, 29.97 tbc
Output #0, mpeg, to 'out-cut3.mpg':
  Metadata:
    encoder         : Lavf54.6.100
    Stream #0:0: Video: mpeg1video, yuv420p, 352x240 [SAR 200:219 DAR
880:657], q=2-31, 2000 kb/s, 29.97 fps, 90k tbn, 29.97 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
frame=  645 fps=0.0 q=-1.0 Lsize=    5270kB time=00:00:21.52
bitrate=2006.0kbits/s
video:5242kB audio:0kB global headers:0kB muxing overhead 0.525027%

More information about the ffmpeg-user mailing list