id,summary,reporter,owner,description,type,status,priority,component,version,resolution,keywords,cc,blockedby,blocking,reproduced,analyzed 2185,Select filter cannot seek to a point in the video,evilsoup,,"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 }}}",defect,closed,normal,avfilter,git-master,wontfix,select,,,,0,0