ffmpeg能够实现对视频进行剪辑操作，ss为指定视频剪切开头的起始时间，t制定视频的总长度，ss与t的单位均为：秒。
ffmpeg -ss 7200 -i 1080p.mp4 -c copy -t 900 1080psrc.mp4
-ss 指定视频剪切起始时间为2:00:00
-i 指定视频源文件
-c 原始编解码数据必须被拷贝，即剪辑前后文件的编码方式保持一致
-t 制定剪取的视频长度
任务执行过程显示：
$ ffmpeg -ss 7200 -i 1080p.mp4 -c copy -t 900 1080psrc.mp4 ffmpeg version 4.1.4-1build2 Copyright (c) 2000-2019 the FFmpeg developers built with gcc 9 (Ubuntu 9.2.1-4ubuntu1) configuration: --prefix=/usr --extra-version=1build2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared libavutil 56. 22.100 / 56. 22.100 libavcodec 58. 35.100 / 58. 35.100 libavformat 58. 20.100 / 58. 20.100 libavdevice 58. 5.100 / 58. 5.100 libavfilter 7. 40.101 / 7. 40.101 libavresample 4. 0. 0 / 4. 0. 0 libswscale 5. 3.100 / 5. 3.100 libswresample 3. 3.100 / 3. 3.100 libpostproc 55. 3.100 / 55. 3.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1080p.mp4': Metadata: major_brand : mp42 minor_version : 1 compatible_brands: isommp423gp5 creation_time : 2019-07-31T13:32:46.000000Z encoder : My MP4Box GUI 0.6.0.6 <http://my-mp4box-gui.zymichost.com> Duration: 03:01:11.42, start: 0.000000, bitrate: 3037 kb/s Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 2794 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default) Metadata: creation_time : 2019-07-31T13:30:02.000000Z handler_name : 复鲁冒脮脽联脙脣4Ｂ好栒久栔� 蓝鹿芒双脳脰幕).Avengers.Endgame.2019.BD-1080p.X264.AAC.CHS.ENG-UUMp4.mp4 encoder : AVC Coding Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 238 kb/s (default) Metadata: creation_time : 2019-07-31T13:33:09.000000Z handler_name : avengers.endgame.2019.1080p.bluray.x264-sparks.m4a Stream #0:2(und): Data: none (mp4s / 0x7334706D), 0 kb/s (default) Metadata: creation_time : 2019-07-31T13:33:12.000000Z handler_name : GPAC MPEG-4 OD Handler Stream #0:3(und): Data: none (mp4s / 0x7334706D), 0 kb/s (default) Metadata: creation_time : 2019-07-31T13:33:12.000000Z handler_name : GPAC MPEG-4 Scene Description Handler Output #0, mp4, to '1080psrc.mp4': Metadata: major_brand : mp42 minor_version : 1 compatible_brands: isommp423gp5 encoder : Lavf58.20.100 Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 2794 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 24k tbc (default) Metadata: creation_time : 2019-07-31T13:30:02.000000Z handler_name : 复鲁冒脮脽联脙脣4Ｂ好栒久栔� 蓝鹿芒双脳脰幕).Avengers.Endgame.2019.BD-1080p.X264.AAC.CHS.ENG-UUMp4.mp4 encoder : AVC Coding Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 238 kb/s (default) Metadata: creation_time : 2019-07-31T13:33:09.000000Z handler_name : avengers.endgame.2019.1080p.bluray.x264-sparks.m4a Stream mapping: Stream #0:0 -> #0:0 (copy) Stream #0:1 -> #0:1 (copy) Press [q] to stop, [?] for help frame=21607 fps=0.0 q=-1.0 Lsize= 352596kB time=00:14:59.98 bitrate=3209.4kbits/s speed=1.79e+03x video:325701kB audio:26302kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.168539%
使用ffprobe查看输出后的1080psrc.mp4文件属性：
$ ffprobe -i 1080psrc.mp4 ffprobe version 4.1.4-1build2 Copyright (c) 2007-2019 the FFmpeg developers built with gcc 9 (Ubuntu 9.2.1-4ubuntu1) configuration: --prefix=/usr --extra-version=1build2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared libavutil 56. 22.100 / 56. 22.100 libavcodec 58. 35.100 / 58. 35.100 libavformat 58. 20.100 / 58. 20.100 libavdevice 58. 5.100 / 58. 5.100 libavfilter 7. 40.101 / 7. 40.101 libavresample 4. 0. 0 / 4. 0. 0 libswscale 5. 3.100 / 5. 3.100 libswresample 3. 3.100 / 3. 3.100 libpostproc 55. 3.100 / 55. 3.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1080psrc.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf58.20.100 Duration: 00:15:01.21, start: 0.000000, bitrate: 3205 kb/s Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 2960 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default) Metadata: handler_name : 复鲁冒脮脽联脙脣4Ｂ好栒久栔� 蓝鹿芒双脳脰幕).Avengers.Endgame.2019.BD-1080p.X264.AAC.CHS.ENG-UUMp4.mp4 Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 239 kb/s (default) Metadata: handler_name : avengers.endgame.2019.1080p.bluray.x264-sparks.m4a