一、不改变分辨率：

ffmpeg -i 01小学_6上习作二_大声说出我爱你.mp4 01小学_6上习作二_大声说出我爱你_t.mp4

前面为源视频文件，后面为目标视频文件

二、改变分辨率：

流畅点播_H264_TD_480*360

标清点播_H264_WLAN_1024*576

高清点播_H264_WLAN_720P

ffmpeg -i 01小学_6上习作二_大声说出我爱你_t.mp4 -s 480x360 01小学_6上习作二_大声说出我爱你_t_480x360.mp4

后为源视频文件, -s 表示设置目标视频文件的分辨率 01小学_6上习作二_大声说出我爱你_t_480x360.mp4为目的视频文件

E:\vod\ffmpeg-3.2.4-win32-static\bin>ffmpeg -i 01小学_6上习作二_大声说出我爱你_t.mp4 -s 480x360 01小学_6上习作二_大声说出我爱你_t_480x360.mp4
ffmpeg version N-79344-g196cfc2 Copyright (c) 2000-2016 the FFmpeg developersbuilt with gcc 5.3.0 (GCC)configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmfx --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zliblibavutil      55. 20.100 / 55. 20.100libavcodec     57. 34.100 / 57. 34.100libavformat    57. 33.100 / 57. 33.100libavdevice    57.  0.101 / 57.  0.101libavfilter     6. 41.100 /  6. 41.100libswscale      4.  1.100 /  4.  1.100libswresample   2.  0.101 /  2.  0.101libpostproc    54.  0.100 / 54.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '01灏忓_6涓婁範浣滀簩_澶у０璇村嚭鎴戠埍浣燺t.mp4':Metadata:major_brand     : isomminor_version   : 512compatible_brands: isomiso2avc1mp41encoder         : Lavf57.33.100Duration: 00:10:23.32, start: 0.000000, bitrate: 208 kb/sStream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 76 kb/s, 15 fps, 15 tbr, 15360 tbn (default)Metadata:handler_name    : VideoHandlerStream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)Metadata:handler_name    : SoundHandler
[libx264 @ 054a8fe0] using SAR=4/3
[libx264 @ 054a8fe0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
[libx264 @ 054a8fe0] profile High, level 2.1
[libx264 @ 054a8fe0] 264 - core 148 r2665 a01e339 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - 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=6 lookahead_threads=1 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=15 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
[mp4 @ 04f2c8e0] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.Last message repeated 1 times
Output #0, mp4, to '01灏忓_6涓婁範浣滀簩_澶у０璇村嚭鎴戠埍浣燺t_480x360.mp4':Metadata:major_brand     : isomminor_version   : 512compatible_brands: isomiso2avc1mp41encoder         : Lavf57.33.100Stream #0:0(eng): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 480x360 [SAR 4:3 DAR 16:9], q=2-31, 15 fps, 15360 tbn (default)Metadata:handler_name    : VideoHandlerencoder         : Lavc57.34.100 libx264Side data:cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1Stream #0:1(eng): Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, fltp, 128 kb/s (default)Metadata:handler_name    : SoundHandlerencoder         : Lavc57.34.100 aac
Stream mapping:Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
frame= 9349 fps=126 q=-1.0 Lsize=   12019kB time=00:10:23.29 bitrate= 158.0kbits/s speed=8.38x
video:1943kB audio:9761kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.699088%
[libx264 @ 054a8fe0] frame I:41    Avg QP:11.18  size: 15855
[libx264 @ 054a8fe0] frame P:2514  Avg QP:12.44  size:   438
[libx264 @ 054a8fe0] frame B:6794  Avg QP:12.08  size:    35
[libx264 @ 054a8fe0] consecutive B-frames:  2.9%  0.4%  0.7% 96.0%
[libx264 @ 054a8fe0] mb I  I16..4: 56.9% 17.3% 25.8%
[libx264 @ 054a8fe0] mb P  I16..4:  0.5%  0.5%  0.3%  P16..4:  2.2%  0.6%  0.5%  0.0%  0.0%    skip:95.4%
[libx264 @ 054a8fe0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.8%  0.1%  0.0%  direct: 0.1%  skip:99.0%  L0:45.6% L1:50.1% BI: 4.3%
[libx264 @ 054a8fe0] 8x8 transform intra:28.9% inter:53.6%
[libx264 @ 054a8fe0] coded y,uvDC,uvAC intra: 30.6% 32.5% 26.8% inter: 0.4% 0.5% 0.2%
[libx264 @ 054a8fe0] i16 v,h,dc,p: 67% 26%  7%  1%
[libx264 @ 054a8fe0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 22% 34%  2%  3%  2%  3%  3%  4%
[libx264 @ 054a8fe0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 31% 26% 14%  4%  5%  5%  5%  6%  5%
[libx264 @ 054a8fe0] i8c dc,h,v,p: 69% 15% 14%  3%
[libx264 @ 054a8fe0] Weighted P-Frames: Y:0.9% UV:0.3%
[libx264 @ 054a8fe0] ref P L0: 75.5% 13.5%  7.8%  3.2%  0.1%
[libx264 @ 054a8fe0] ref B L0: 70.3% 28.7%  0.9%
[libx264 @ 054a8fe0] ref B L1: 95.5%  4.5%
[libx264 @ 054a8fe0] kb/s:25.52
[aac @ 04ef2740] Qavg: 3132.729E:\vod\ffmpeg-3.2.4-win32-static\bin>