Я пытаюсь конвертировать видео с 24fps в 12fps. Хотя кажется, что преобразование работает, ffmpeg также увеличивает длительность выходного видео (примерно на секунду дольше). Казалось бы, выходное видео должно быть похожим или короче исходного видео.
Вот команды, которые я попробовал:
ffmpeg -i src.mov -r 12 out.mov
ffmpeg -r 24 -i src.mov -r 12 out.mov
И полный вывод:
$ ffmpeg -i src.mov -r 12 output.mov
ffmpeg version 2.4.3 Copyright (c) 2000-2014 the FFmpeg developers
built on Nov 6 2014 23:40:10 with Apple LLVM version 6.0 (clang-600.0.54) (based on LLVM 3.5svn)
configuration: --prefix=/usr/local/Cellar/ffmpeg/2.4.3 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
libavutil 54. 7.100 / 54. 7.100
libavcodec 56. 1.100 / 56. 1.100
libavformat 56. 4.101 / 56. 4.101
libavdevice 56. 0.100 / 56. 0.100
libavfilter 5. 1.100 / 5. 1.100
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 0.100 / 3. 0.100
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 0.100 / 53. 0.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fc18980da00] multiple edit list entries, a/v desync might occur, patch welcome
Last message repeated 1 times
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'src.mov':
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Metadata:
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Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 191 kb/s (default)
Metadata:
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[libx264 @ 0x7fc189829a00] using SAR=1/1
[libx264 @ 0x7fc189829a00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
[libx264 @ 0x7fc189829a00] profile High, level 3.1
[libx264 @ 0x7fc189829a00] 264 - core 142 r2455 021c0dc - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - 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 lookahead_threads=2 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=12 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, mov, to 'output.mov':
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Metadata:
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encoder : Lavc56.1.100 libfaac
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (aac (native) -> aac (libfaac))
Press [q] to stop, [?] for help
frame= 45 fps=0.0 q=-1.0 Lsize= 504kB time=00:00:03.58 bitrate=1153.1kbits/s dup=1 drop=39
video:496kB audio:1kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.351465%
[libx264 @ 0x7fc189829a00] frame I:1 Avg QP:16.16 size: 19137
[libx264 @ 0x7fc189829a00] frame P:42 Avg QP:19.07 size: 11474
[libx264 @ 0x7fc189829a00] frame B:2 Avg QP:19.62 size: 3256
[libx264 @ 0x7fc189829a00] consecutive B-frames: 91.1% 8.9% 0.0% 0.0%
[libx264 @ 0x7fc189829a00] mb I I16..4: 39.3% 57.6% 3.1%
[libx264 @ 0x7fc189829a00] mb P I16..4: 10.8% 22.4% 0.4% P16..4: 36.1% 6.9% 2.4% 0.0% 0.0% skip:20.9%
[libx264 @ 0x7fc189829a00] mb B I16..4: 0.7% 2.1% 0.0% B16..8: 25.5% 2.5% 0.3% direct: 3.2% skip:65.8% L0:59.6% L1:36.8% BI: 3.6%
[libx264 @ 0x7fc189829a00] 8x8 transform intra:66.0% inter:89.9%
[libx264 @ 0x7fc189829a00] coded y,uvDC,uvAC intra: 30.7% 68.7% 5.3% inter: 12.0% 39.0% 0.2%
[libx264 @ 0x7fc189829a00] i16 v,h,dc,p: 33% 27% 18% 22%
[libx264 @ 0x7fc189829a00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 34% 25% 28% 2% 2% 2% 2% 2% 2%
[libx264 @ 0x7fc189829a00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 38% 23% 12% 4% 6% 6% 5% 4% 3%
[libx264 @ 0x7fc189829a00] i8c dc,h,v,p: 42% 25% 30% 4%
[libx264 @ 0x7fc189829a00] Weighted P-Frames: Y:7.1% UV:2.4%
[libx264 @ 0x7fc189829a00] ref P L0: 74.8% 5.4% 14.9% 4.7% 0.2%
[libx264 @ 0x7fc189829a00] ref B L0: 90.9% 9.1%
[libx264 @ 0x7fc189829a00] kb/s:1082.75