[FFmpeg-trac] #2185(avfilter:new): Select filter cannot seek to a point in the video
FFmpeg
trac at avcodec.org
Thu Jan 24 23:02:42 CET 2013
#2185: Select filter cannot seek to a point in the video
-------------------------------------+-------------------------------------
Reporter: evilsoup | Type: defect
Status: new | Priority: normal
Component: avfilter | Version: git-
Keywords: select, | master
video filter | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
As per the [http://ffmpeg.org/ffmpeg-filters.html#aselect_002c-
select|filter documentation], using a line like:
{{{
filter:v 'select=gte(t\,12)'
}}}
...should output video starting at the 12th second, akin to using `-ss 12`
as an output option.
However, when used in the following command, on a 30-second clip of ''Big
Buck Bunny'' (so I would expect to end up with an 18-second clip, starting
at a point 12 seconds into the input:
{{{
ffmpeg -y -i test_BBB.mp4 -filter:v 'select=gte(t\,12)' -c:v libx264
-preset veryfast -an test_BBB-t12c.mp4
}}}
...but instead, it gives me a 30-second clip (the same length as the
input), but with the first frame that should be displayed (the frame at 12
seconds into the video) being displayed all throughout the first twelve
seconds - and then the video proceeds as would be expected.
Obviously, the example I'm using here is a trivial usage of select, where
`-ss` would be a better option; but this behaviour also affects complex
filtergraphs.
The aselect audio filter doesn't suffer from the same problem, it behaves
exactly as would be expected.
It reports no errors, but for the record here's the terminal output of my
command above:
{{{
ffmpeg version git-2012-12-18-b7e085a Copyright (c) 2000-2012 the FFmpeg
developers
built on Dec 20 2012 11:44:19 with gcc 4.6 (Ubuntu/Linaro
4.6.3-1ubuntu5)
configuration: --enable-gpl --enable-libfaac --enable-libfdk-aac
--enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb
--enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx
--enable-x11grab --enable-libx264 --enable-nonfree --enable-version3
--enable-libass
libavutil 52. 12.100 / 52. 12.100
libavcodec 54. 80.100 / 54. 80.100
libavformat 54. 49.102 / 54. 49.102
libavdevice 54. 3.102 / 54. 3.102
libavfilter 3. 28.100 / 3. 28.100
libswscale 2. 1.103 / 2. 1.103
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 2.100 / 52. 2.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test_BBB.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
title : Big Buck Bunny
artist : Blender Foundation
composer : Blender Foundation
date : 2008
encoder : Lavf54.49.102
Duration: 00:00:30.02, start: 0.000000, bitrate: 858 kb/s
Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 /
0x31637661), yuv420p, 320x180 [SAR 1:1 DAR 16:9], 694 kb/s, 24 fps, 24
tbr, 12288 tbn, 48 tbc
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo,
fltp, 160 kb/s
Metadata:
handler_name : SoundHandler
[libx264 @ 0x9f5e7a0] using SAR=1/1
[libx264 @ 0x9f5e7a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
SlowCTZ SlowAtom
[libx264 @ 0x9f5e7a0] profile High, level 1.2
[libx264 @ 0x9f5e7a0] 264 - core 129 r2 1cffe9f - H.264/MPEG-4 AVC codec -
Copyleft 2003-2012 - http://www.videolan.org/x264.html - options: cabac=1
ref=1 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=2 psy=1
psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1
cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=3
lookahead_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=1 keyint=250 keyint_min=24
scenecut=40 intra_refresh=0 rc_lookahead=10 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 'test_BBB-t12c.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
title : Big Buck Bunny
artist : Blender Foundation
composer : Blender Foundation
date : 2008
encoder : Lavf54.49.102
Stream #0:0(und): Video: h264 ([33][0][0][0] / 0x0021), yuv420p,
320x180 [SAR 1:1 DAR 16:9], q=-1--1, 12288 tbn, 24 tbc
Metadata:
handler_name : VideoHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 -> libx264)
Press [q] to stop, [?] for help
frame= 0 fps=0.0 q=0.0 size= 0kB time=00:00:00.00 bitrate=
0.0kbits/s
frame= 290 fps=202 q=28.0 size= 37kB time=00:00:11.29 bitrate=
27.2kbits/s dup=288 drop=0
frame= 348 fps=179 q=28.0 size= 87kB time=00:00:13.70 bitrate=
52.0kbits/s dup=288 drop=0
frame= 397 fps=161 q=28.0 size= 151kB time=00:00:15.75 bitrate=
78.4kbits/s dup=288 drop=0
frame= 466 fps=157 q=28.0 size= 178kB time=00:00:18.62 bitrate=
78.5kbits/s dup=288 drop=0
frame= 529 fps=153 q=28.0 size= 210kB time=00:00:21.25 bitrate=
80.8kbits/s dup=288 drop=0
frame= 593 fps=149 q=28.0 size= 249kB time=00:00:23.91 bitrate=
85.2kbits/s dup=288 drop=0
frame= 636 fps=142 q=28.0 size= 298kB time=00:00:25.70 bitrate=
94.9kbits/s dup=288 drop=0
frame= 685 fps=137 q=28.0 size= 350kB time=00:00:27.75 bitrate=
103.2kbits/s dup=288 drop=0
frame= 720 fps=131 q=28.0 Lsize= 414kB time=00:00:29.91 bitrate=
113.3kbits/s dup=288 drop=0
video:406kB audio:0kB subtitle:0 global headers:0kB muxing overhead
1.971170%
[libx264 @ 0x9f5e7a0] frame I:4 Avg QP:21.22 size: 15216
[libx264 @ 0x9f5e7a0] frame P:341 Avg QP:25.16 size: 982
[libx264 @ 0x9f5e7a0] frame B:375 Avg QP:29.70 size: 51
[libx264 @ 0x9f5e7a0] consecutive B-frames: 28.2% 3.3% 11.2% 57.2%
[libx264 @ 0x9f5e7a0] mb I I16..4: 4.2% 5.9% 89.9%
[libx264 @ 0x9f5e7a0] mb P I16..4: 0.2% 0.3% 0.2% P16..4: 33.6% 7.2%
5.1% 0.0% 0.0% skip:53.5%
[libx264 @ 0x9f5e7a0] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 1.5% 0.6%
0.1% direct: 0.5% skip:97.1% L0:27.4% L1:41.2% BI:31.5%
[libx264 @ 0x9f5e7a0] 8x8 transform intra:19.0% inter:25.0%
[libx264 @ 0x9f5e7a0] coded y,uvDC,uvAC intra: 73.4% 85.2% 65.9% inter:
10.2% 5.4% 1.1%
[libx264 @ 0x9f5e7a0] i16 v,h,dc,p: 22% 43% 24% 11%
[libx264 @ 0x9f5e7a0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 14% 48% 28% 1% 1%
2% 1% 2% 3%
[libx264 @ 0x9f5e7a0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 17% 16% 6% 8%
7% 9% 7% 10%
[libx264 @ 0x9f5e7a0] i8c dc,h,v,p: 49% 24% 15% 11%
[libx264 @ 0x9f5e7a0] Weighted P-Frames: Y:1.5% UV:0.0%
[libx264 @ 0x9f5e7a0] kb/s:110.62
}}}
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2185>
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