使用ffmpeg快速截取一段视频
背景描述
一段录制的视频, 需要剪切前36分钟的信息.
直接用 -t（持续时间）参数，比 -to（时间戳）更快，因为不会先解码到指定点：
bash
ffmpeg -i input.mp4 -t 00:36:00 -c copy output.mp4说明：
-t 00:36:00：只截取前 36 分钟-c copy：流拷贝模式，不重新编码，速度极快，画质无损- 后面的内容直接丢弃
推荐用法
| 场景 | 命令 |
|---|---|
| 要快、不重编码 | ffmpeg -i in.mp4 -t 00:36:00 -c copy out.mp4 ✅ |
| 要精确切割、可接受慢 | 去掉 -c copy，重编码 |
| 大文件想再快一点 | 加 -avoid_negative_ts make_zero 防时间戳异常 |
补充：用秒数写法（等价）
bash
ffmpeg -i input.mp4 -t 2160 -c copy output.mp4(36×60=2160 秒)
具体
txt
Microsoft Windows [版本 10.0.19045.6466]
(c) Microsoft Corporation。保留所有权利。
C:\Users\bushuo\Videos>ffmpeg -i "2026-08-19 19-52-26.mp4" -t 00:36:00 -c copy output.mp4
ffmpeg version 2026-07-23-git-80eb9e99b9-full_build-www.gyan.dev Copyright (c) 2000-2026 the FFmpeg developers
built with gcc 16.1.0 (Rev2, Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-cairo --enable-fontconfig --enable-iconv --enable-gnutls --enable-lcms2 --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libopenjpeg --enable-libquirc --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-liboapv --enable-libqrencode --enable-librav1e --enable-libsvtav1 --enable-libvvenc --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libsvtjpegxs --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-openal --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-liblc3 --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint --enable-whisper
libavutil 61. 5.100 / 61. 5.100
libavcodec 63. 6.101 / 63. 6.101
libavformat 63. 5.101 / 63. 5.101
libavdevice 63. 2.100 / 63. 2.100
libavfilter 12. 3.101 / 12. 3.101
libswscale 10. 2.100 / 10. 2.100
libswresample 7. 2.100 / 7. 2.100
[in#0 @ 000001d6a9af14c0] UDTA parsing failed retrying raw
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '2026-08-19 19-52-26.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf60.3.100
Duration: 00:49:27.90, start: 0.000000, bitrate: 1169 kb/s
Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 2560x1440 [SAR 1:1 DAR 16:9], 998 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
Metadata:
handler_name : VideoHandler
Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 162 kb/s (default)
Metadata:
handler_name : SoundHandler
name : simple_aac_recording0
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Output #0, mp4, to 'output.mp4':
Metadata:
encoder : Lavf63.5.101
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 2560x1440 [SAR 1:1 DAR 16:9], q=2-31, 998 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 162 kb/s (default)
Metadata:
handler_name : SoundHandler
name : simple_aac_recording0
Press [q] to stop, [?] for help
frame=47391 fps=0.0 q=-1.0 size= 162560KiB time=00:26:18.60 bitrate= 843.6kbits/s speed=3.15e+03x elapsed=0:00:00.[out#0/mp4 @ 000001d6a9b7c180] video:186493KiB audio:43331KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 0.939835%
frame=64802 fps=0.0 q=-1.0 Lsize= 231984KiB time=00:36:00.03 bitrate= 879.8kbits/s speed=2.84e+03x elapsed=0:00:00.75