更新：我在另一台机器上观看了输出视频，一切正常。问题肯定出在我用来观看视频的程序上。没关系。
我正在尝试压缩用佳能相机拍摄的视频以便存储。不幸的是，输出视频的帧速率降低了，这导致视频不流畅。我尝试使用 -r 25 来增加帧速率，但没有什么不同。ffmpeg 似乎忽略了该选项。有没有办法强制 ffmpeg 使用更高质量的可变帧速率或恒定帧速率？我需要使用不同的视频编解码器吗？我需要使用 ffmpeg 以外的其他东西吗？经过大量研究，我还没有取得任何进展。如果需要，我可以添加输入和输出视频的链接。这是一个示例运行：
H:\test>ffmpeg -i input.mov -c:v libx264 -crf 23 -r 25 -force_fps -c:a aac -stri
ct experimental out.mp4
ffmpeg version N-59532-gadc09a3 Copyright (c) 2000-2014 the FFmpeg developers
built on Jan 3 2014 22:01:54 with gcc 4.8.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
eex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aa
cenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavp
ack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
libavutil 52. 59.100 / 52. 59.100
libavcodec 55. 47.100 / 55. 47.100
libavformat 55. 22.102 / 55. 22.102
libavdevice 55. 5.102 / 55. 5.102
libavfilter 4. 0.103 / 4. 0.103
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 17.104 / 0. 17.104
libpostproc 52. 3.100 / 52. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mov':
Metadata:
major_brand : qt
minor_version : 537331968
compatible_brands: qt CAEP
creation_time : 2013-09-05 22:18:02
Duration: 00:00:17.04, start: 0.000000, bitrate: 21175 kb/s
Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yu
vj420p(pc, smpte170m), 1280x720, 19592 kb/s, 25 fps, 25 tbr, 25k tbn, 50k tbc (d
efault)
Metadata:
creation_time : 2013-09-05 22:18:02
Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, stereo, s1
6, 1536 kb/s (default)
Metadata:
creation_time : 2013-09-05 22:18:02
No pixel format specified, yuvj420p for H.264 encoding chosen.
Use -pix_fmt yuv420p for compatibility with outdated media players.
[libx264 @ 0319fc20] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.1 Cache64
[libx264 @ 0319fc20] profile High, level 3.1
[libx264 @ 0319fc20] 264 - core 140 r2377 1ca7bb9 - H.264/MPEG-4 AVC codec - Cop
yleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deb
lock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 m
e_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chro
ma_qp_offset=-2 threads=3 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 i
nterlaced=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 scenec
ut=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.mp4':
Metadata:
major_brand : qt
minor_version : 537331968
compatible_brands: qt CAEP
encoder : Lavf55.22.102
Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuvj420p,
1280x720, q=-1--1, 12800 tbn, 25 tbc (default)
Metadata:
creation_time : 2013-09-05 22:18:02
Stream #0:1(eng): Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, flt
p, 128 kb/s (default)
Metadata:
creation_time : 2013-09-05 22:18:02
Stream mapping:
Stream #0:0 -> #0:0 (h264 -> libx264)
Stream #0:1 -> #0:1 (pcm_s16le -> aac)
Press [q] to stop, [?] for help
frame= 46 fps=0.0 q=0.0 size= 0kB time=00:00:01.89 bitrate= 0.2kbits/s
frame= 53 fps= 41 q=28.0 size= 77kB time=00:00:02.34 bitrate= 268.0kbits/
frame= 58 fps= 33 q=28.0 size= 152kB time=00:00:02.34 bitrate= 531.2kbits/
frame= 65 fps= 27 q=28.0 size= 246kB time=00:00:02.83 bitrate= 711.6kbits/
frame= 70 fps= 24 q=28.0 size= 303kB time=00:00:02.85 bitrate= 869.2kbits/
frame= 76 fps= 22 q=28.0 size= 370kB time=00:00:03.30 bitrate= 916.8kbits/
frame= 82 fps= 20 q=28.0 size= 437kB time=00:00:03.30 bitrate=1082.6kbits/
frame= 87 fps= 19 q=26.0 size= 505kB time=00:00:03.79 bitrate=1089.7kbits/
frame= 94 fps= 19 q=28.0 size= 630kB time=00:00:03.79 bitrate=1358.8kbits/
frame= 99 fps= 18 q=28.0 size= 708kB time=00:00:04.26 bitrate=1358.9kbits/
frame= 104 fps= 17 q=28.0 size= 782kB time=00:00:04.26 bitrate=1502.3kbits/
frame= 111 fps= 16 q=28.0 size= 913kB time=00:00:04.75 bitrate=1572.5kbits/
frame= 117 fps= 16 q=28.0 size= 1004kB time=00:00:04.75 bitrate=1729.6kbits/
frame= 124 fps= 15 q=28.0 size= 1104kB time=00:00:05.22 bitrate=1729.9kbits/
frame= 130 fps= 15 q=28.0 size= 1217kB time=00:00:05.22 bitrate=1907.4kbits/
frame= 135 fps= 14 q=28.0 size= 1372kB time=00:00:05.71 bitrate=1966.4kbits/
frame= 139 fps= 14 q=28.0 size= 1538kB time=00:00:05.71 bitrate=2203.6kbits/
frame= 142 fps= 13 q=28.0 size= 1644kB time=00:00:05.73 bitrate=2346.4kbits/
frame= 148 fps= 13 q=28.0 size= 1838kB time=00:00:06.18 bitrate=2433.3kbits/
frame= 153 fps= 13 q=28.0 size= 2016kB time=00:00:06.18 bitrate=2669.4kbits/
frame= 157 fps= 13 q=28.0 size= 2170kB time=00:00:06.67 bitrate=2662.2kbits/
frame= 162 fps= 12 q=28.0 size= 2398kB time=00:00:06.67 bitrate=2942.2kbits/
frame= 166 fps= 12 q=28.0 size= 2556kB time=00:00:06.67 bitrate=3135.8kbits/
frame= 171 fps= 12 q=28.0 size= 2745kB time=00:00:07.14 bitrate=3146.4kbits/
frame= 177 fps= 12 q=28.0 size= 2987kB time=00:00:07.14 bitrate=3424.4kbits/
frame= 182 fps= 12 q=28.0 size= 3223kB time=00:00:07.63 bitrate=3457.1kbits/
frame= 188 fps= 12 q=28.0 size= 3481kB time=00:00:07.63 bitrate=3734.2kbits/
frame= 193 fps= 12 q=28.0 size= 3688kB time=00:00:08.10 bitrate=3726.3kbits/
frame= 198 fps= 11 q=28.0 size= 3894kB time=00:00:08.10 bitrate=3934.8kbits/
frame= 202 fps= 11 q=28.0 size= 4084kB time=00:00:08.10 bitrate=4126.8kbits/
frame= 208 fps= 11 q=28.0 size= 4388kB time=00:00:08.59 bitrate=4181.1kbits/
frame= 213 fps= 11 q=28.0 size= 4592kB time=00:00:08.59 bitrate=4375.6kbits/
frame= 218 fps= 11 q=28.0 size= 4805kB time=00:00:09.06 bitrate=4341.8kbits/
frame= 222 fps= 11 q=28.0 size= 4976kB time=00:00:09.06 bitrate=4495.5kbits/
frame= 226 fps= 11 q=28.0 size= 5139kB time=00:00:09.17 bitrate=4589.1kbits/
frame= 231 fps= 11 q=28.0 size= 5388kB time=00:00:09.55 bitrate=4618.3kbits/
frame= 236 fps= 11 q=28.0 size= 5597kB time=00:00:09.55 bitrate=4797.0kbits/
frame= 241 fps= 11 q=28.0 size= 5820kB time=00:00:10.02 bitrate=4754.9kbits/
frame= 244 fps= 10 q=28.0 size= 5929kB time=00:00:10.02 bitrate=4844.1kbits/
frame= 247 fps= 10 q=25.0 size= 6074kB time=00:00:10.02 bitrate=4962.3kbits/
frame= 252 fps= 10 q=28.0 size= 6366kB time=00:00:10.51 bitrate=4958.3kbits/
frame= 257 fps= 10 q=28.0 size= 6678kB time=00:00:10.51 bitrate=5201.1kbits/
frame= 260 fps= 10 q=28.0 size= 6888kB time=00:00:10.51 bitrate=5365.1kbits/
frame= 265 fps= 10 q=28.0 size= 7162kB time=00:00:10.98 bitrate=5340.1kbits/
frame= 269 fps=9.9 q=28.0 size= 7360kB time=00:00:10.98 bitrate=5487.6kbits/
frame= 273 fps=9.9 q=28.0 size= 7577kB time=00:00:10.98 bitrate=5650.0kbits/
frame= 276 fps=9.8 q=28.0 size= 7793kB time=00:00:11.47 bitrate=5562.6kbits/
frame= 280 fps=9.7 q=28.0 size= 7997kB time=00:00:11.47 bitrate=5708.1kbits/
frame= 284 fps=9.6 q=28.0 size= 8242kB time=00:00:11.47 bitrate=5882.8kbits/
frame= 289 fps=9.5 q=28.0 size= 8546kB time=00:00:11.94 bitrate=5860.2kbits/
frame= 293 fps=9.5 q=28.0 size= 8783kB time=00:00:11.94 bitrate=6023.0kbits/
frame= 298 fps=9.4 q=28.0 size= 9060kB time=00:00:11.94 bitrate=6212.6kbits/
frame= 302 fps=9.4 q=28.0 size= 9312kB time=00:00:12.43 bitrate=6133.1kbits/
frame= 306 fps=9.3 q=28.0 size= 9535kB time=00:00:12.43 bitrate=6280.6kbits/
frame= 309 fps=9.3 q=28.0 size= 9701kB time=00:00:12.43 bitrate=6389.6kbits/
frame= 313 fps=9.2 q=28.0 size= 9923kB time=00:00:12.90 bitrate=6298.4kbits/
frame= 316 fps=9.2 q=28.0 size= 10074kB time=00:00:12.90 bitrate=6394.2kbits/
frame= 321 fps=9.1 q=28.0 size= 10300kB time=00:00:12.90 bitrate=6537.8kbits/
frame= 326 fps=9.1 q=28.0 size= 10542kB time=00:00:13.39 bitrate=6445.9kbits/
frame= 332 fps=9.1 q=28.0 size= 10853kB time=00:00:13.39 bitrate=6636.1kbits/
frame= 337 fps=9.0 q=28.0 size= 11126kB time=00:00:13.86 bitrate=6573.2kbits/
frame= 342 fps=9.0 q=28.0 size= 11391kB time=00:00:13.86 bitrate=6729.7kbits/
frame= 346 fps=9.0 q=28.0 size= 11588kB time=00:00:14.16 bitrate=6701.2kbits/
frame= 351 fps=9.0 q=28.0 size= 11843kB time=00:00:14.35 bitrate=6757.5kbits/
frame= 355 fps=9.0 q=28.0 size= 12061kB time=00:00:14.35 bitrate=6881.6kbits/
frame= 361 fps=9.0 q=28.0 size= 12349kB time=00:00:14.82 bitrate=6822.8kbits/
frame= 367 fps=9.0 q=28.0 size= 12620kB time=00:00:14.82 bitrate=6972.6kbits/
frame= 372 fps=9.0 q=28.0 size= 12868kB time=00:00:15.31 bitrate=6881.9kbits/
frame= 377 fps=8.9 q=28.0 size= 13054kB time=00:00:15.31 bitrate=6981.7kbits/
frame= 382 fps=8.9 q=28.0 size= 13284kB time=00:00:15.31 bitrate=7104.7kbits/
frame= 388 fps=9.0 q=28.0 size= 13538kB time=00:00:15.78 bitrate=7025.1kbits/
frame= 393 fps=9.0 q=28.0 size= 13740kB time=00:00:15.78 bitrate=7129.9kbits/
frame= 397 fps=8.9 q=28.0 size= 13918kB time=00:00:16.27 bitrate=7004.5kbits/
frame= 403 fps=9.0 q=28.0 size= 14150kB time=00:00:16.27 bitrate=7121.2kbits/
frame= 408 fps=9.0 q=28.0 size= 14338kB time=00:00:16.74 bitrate=7013.8kbits/
frame= 412 fps=9.0 q=28.0 size= 14494kB time=00:00:16.74 bitrate=7090.2kbits/
frame= 417 fps=9.0 q=28.0 size= 14663kB time=00:00:16.74 bitrate=7172.7kbits/
frame= 423 fps=9.0 q=28.0 size= 14918kB time=00:00:16.98 bitrate=7196.5kbits/
frame= 426 fps=8.1 q=-1.0 Lsize= 17139kB time=00:00:17.04 bitrate=8237.1kbits
/s
video:16860kB audio:267kB subtitle:0 global headers:0kB muxing overhead 0.074326
%
[libx264 @ 0319fc20] frame I:7 Avg QP:22.59 size: 32989
[libx264 @ 0319fc20] frame P:297 Avg QP:26.67 size: 47713
[libx264 @ 0319fc20] frame B:122 Avg QP:29.30 size: 23459
[libx264 @ 0319fc20] consecutive B-frames: 43.0% 56.3% 0.7% 0.0%
[libx264 @ 0319fc20] mb I I16..4: 34.1% 58.2% 7.7%
[libx264 @ 0319fc20] mb P I16..4: 5.9% 14.0% 6.5% P16..4: 43.0% 18.8% 9.0%
0.0% 0.0% skip: 2.8%
[libx264 @ 0319fc20] mb B I16..4: 0.6% 1.2% 0.5% B16..8: 50.5% 11.3% 3.1%
direct:14.7% skip:18.1% L0:38.2% L1:37.5% BI:24.3%
[libx264 @ 0319fc20] 8x8 transform intra:53.3% inter:48.3%
[libx264 @ 0319fc20] coded y,uvDC,uvAC intra: 67.6% 70.7% 24.2% inter: 56.1% 47.
0% 1.4%
[libx264 @ 0319fc20] i16 v,h,dc,p: 16% 24% 21% 39%
[libx264 @ 0319fc20] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 22% 24% 5% 5% 5% 7%
6% 8%
[libx264 @ 0319fc20] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 21% 19% 6% 7% 6% 7%
7% 7%
[libx264 @ 0319fc20] i8c dc,h,v,p: 54% 25% 16% 5%
[libx264 @ 0319fc20] Weighted P-Frames: Y:20.5% UV:14.8%
[libx264 @ 0319fc20] ref P L0: 63.8% 21.7% 10.3% 4.0% 0.2%
[libx264 @ 0319fc20] ref B L0: 94.9% 5.1% 0.0%
[libx264 @ 0319fc20] ref B L1: 100.0% 0.0%
[libx264 @ 0319fc20] kb/s:8105.05