这视频链接在这儿。
$ffmpeg -i 9.mp4 out.mp4
ffmpeg version N-86676-g45dbb40cd1-static http://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 5.4.1 (Debian 5.4.1-11) 20170519
configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-5 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg
libavutil 55. 67.100 / 55. 67.100
libavcodec 57.100.102 / 57.100.102
libavformat 57. 75.100 / 57. 75.100
libavdevice 57. 7.100 / 57. 7.100
libavfilter 6. 94.100 / 6. 94.100
libswscale 4. 7.101 / 4. 7.101
libswresample 2. 8.100 / 2. 8.100
libpostproc 54. 6.100 / 54. 6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '9.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
artist : moodyz
encoder : Lavf57.75.100
copyright : moodyz
Duration: 00:00:21.02, start: 0.000000, bitrate: 5662 kb/s
Stream #0:0(jpn): Video: vc1 (Advanced) (vc-1 / 0x312D6376), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 5658 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
Metadata:
handler_name : VideoHandler
Stream mapping:
Stream #0:0 -> #0:0 (vc1 (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x3eabba0] using SAR=1/1
[libx264 @ 0x3eabba0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0x3eabba0] profile High, level 4.0
[libx264 @ 0x3eabba0] 264 - core 152 r19 ba24899 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - 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=3 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=25 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
Output #0, mp4, to 'out.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
artist : moodyz
copyright : moodyz
encoder : Lavf57.75.100
Stream #0:0(jpn): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc (default)
Metadata:
handler_name : VideoHandler
encoder : Lavc57.100.102 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame= 1 fps=0.0 q=29.0 Lsize= 33kB time=00:00:00.00 bitrate=8254060.6kbits/s speed=0.000122x
video:32kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.640781%
[libx264 @ 0x3eabba0] frame I:1 Avg QP:23.97 size: 32485
[libx264 @ 0x3eabba0] mb I I16..4: 24.7% 72.0% 3.3%
[libx264 @ 0x3eabba0] 8x8 transform intra:72.0%
[libx264 @ 0x3eabba0] coded y,uvDC,uvAC intra: 31.5% 51.4% 4.9%
[libx264 @ 0x3eabba0] i16 v,h,dc,p: 50% 28% 11% 10%
[libx264 @ 0x3eabba0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 58% 19% 17% 1% 1% 1% 1% 1% 1%
[libx264 @ 0x3eabba0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 53% 22% 7% 4% 2% 5% 2% 3% 2%
[libx264 @ 0x3eabba0] i8c dc,h,v,p: 47% 20% 31% 2%
[libx264 @ 0x3eabba0] kb/s:7788.61
原始视频“持续时间：00：00：21.02”，但输出文件只有“持续时间00：00：00.03”。
我需要添加哪些参数？