问题描述
我正在使用以下命令来压缩我的视频：
ffmpeg -y -i video.mp4 -vcodec libx264 -crf 24 -preset ultrafast compressed.mp4
尽管可以，但由于我更改了视频的帧频，因此持续时间略有增加，我们需要将视频设为准确的持续时间。有没有一种方法可以在不更改帧率的情况下压缩视频？任何帮助，将不胜感激。谢谢。
日志：
ffmpeg version git-2020-08-31-4a11a6f copyright (c) 2000-2020 the FFmpeg developers
built with gcc 10.2.1 (GCC) 20200805
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libgsm --enable-librav1e --enable-libsvtav1 --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
libavutil 56. 58.100 / 56. 58.100
libavcodec 58.101.101 / 58.101.101
libavformat 58. 51.101 / 58. 51.101
libavdevice 58. 11.101 / 58. 11.101
libavfilter 7. 87.100 / 7. 87.100
libswscale 5. 8.100 / 5. 8.100
libswresample 3. 8.100 / 3. 8.100
libpostproc 55. 8.100 / 55. 8.100
Input #0,mov,mp4,m4a,3gp,3g2,mj2,from '1600498063375.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
creation_time : 2020-09-19T06:47:54.000000Z
com.android.version: 10
Duration: 00:00:10.53,start: 0.000000,bitrate: 4613 kb/s
Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661),yuv420p(tv,bt709),776x1440,4611 kb/s,SAR 1:1 DAR 97:180,19.11 fps,16.42 tbr,90k tbn,180k tbc (default)
Metadata:
creation_time : 2020-09-19T06:47:54.000000Z
handler_name : VideoHandle
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Press [q] to stop,[?] for help
[libx264 @ 000001e25a673ac0] using SAR=1/1
[libx264 @ 000001e25a673ac0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 000001e25a673ac0] profile Constrained Baseline,level 3.2,4:2:0,8-bit
[libx264 @ 000001e25a673ac0] 264 - core 161 - H.264/MPEG-4 AVC codec - copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=16 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=24.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
Output #0,to 'compressed.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
com.android.version: 10
encoder : Lavf58.51.101
Stream #0:0(eng): Video: h264 (libx264) (avc1 / 0x31637661),yuv420p,776x1440 [SAR 1:1 DAR 97:180],q=-1--1,16.42 fps,12608 tbn,16.42 tbc (default)
Metadata:
creation_time : 2020-09-19T06:47:54.000000Z
handler_name : VideoHandle
encoder : Lavc58.101.101 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
frame= 181 fps= 95 q=-1.0 Lsize= 5244kB time=00:00:10.96 bitrate=3918.2kbits/s dup=1 drop=29 speed=5.76x
video:5243kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.030269%
[libx264 @ 000001e25a673ac0] frame I:1 Avg QP:21.00 size: 92845
[libx264 @ 000001e25a673ac0] frame P:180 Avg QP:22.42 size: 29306
[libx264 @ 000001e25a673ac0] mb I I16..4: 100.0% 0.0% 0.0%
[libx264 @ 000001e25a673ac0] mb P I16..4: 35.6% 0.0% 0.0% P16..4: 39.9% 0.0% 0.0% 0.0% 0.0% skip:24.6%
[libx264 @ 000001e25a673ac0] coded y,uvDC,uvAC intra: 34.6% 31.8% 2.5% inter: 28.7% 17.1% 0.7%
[libx264 @ 000001e25a673ac0] i16 v,h,dc,p: 38% 18% 20% 23%
[libx264 @ 000001e25a673ac0] i8c dc,v,p: 48% 17% 25% 9%
[libx264 @ 000001e25a673ac0] kb/s:3894.93
解决方法
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