執行任何 ffmpeg 命令后
ffmpeg -i "in.mov" -c:v libx264 "out.mp4"
控制臺中輸出了很多編碼統計資訊，例如
ffmpeg version git-2020-07-15-a54b367 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 9.3.1 (GCC) 20200621
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 --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. 55.100 / 56. 55.100
libavcodec 58. 96.100 / 58. 96.100
libavformat 58. 48.100 / 58. 48.100
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 'in.mov':
Metadata:
major_brand : qt
minor_version : 512
compatible_brands: qt
creation_time : 2021-11-19T04:54:24.000000Z
encoder : Blackmagic Design DaVinci Resolve Studio
Duration: 00:00:15.02, start: 0.000000, bitrate: 513581 kb/s
Stream #0:0: Video: dnxhd (DNXHR SQ) (AVdh / 0x68645641), yuv422p(tv, bt709/bt709/unknown), 2560x1440, 511272 kb/s, SAR 1:1 DAR 16:9, 60 fps, 60 tbr, 15360 tbn, 15360 tbc (default)
Metadata:
creation_time : 2021-11-19T04:54:24.000000Z
handler_name : VideoHandler
encoder : DNxHR SQ
timecode : 00:32:01:20
Stream #0:1: Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, stereo, s32 (24 bit), 2304 kb/s (default)
Metadata:
creation_time : 2021-11-19T04:54:24.000000Z
handler_name : SoundHandler
Stream #0:2(eng): Data: none (tmcd / 0x64636D74), 0 kb/s
Metadata:
creation_time : 2021-11-19T04:54:24.000000Z
handler_name : TimeCodeHandler
timecode : 00:32:01:20
Stream mapping:
Stream #0:0 -> #0:0 (dnxhd (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (pcm_s24le (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 000001f24216e180] using SAR=1/1
[libx264 @ 000001f24216e180] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 000001f24216e180] profile High 4:2:2, level 5.1, 4:2:2, 8-bit
[libx264 @ 000001f24216e180] 264 - core 160 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - 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=36 lookahead_threads=6 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 : qt
minor_version : 512
compatible_brands: qt
encoder : Lavf58.48.100
Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv422p(progressive), 2560x1440 [SAR 1:1 DAR 16:9], q=-1--1, 0.02 fps, 15360 tbn, 60 tbc (default)
Metadata:
creation_time : 2021-11-19T04:54:24.000000Z
handler_name : VideoHandler
timecode : 00:32:01:20
encoder : Lavc58.96.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp (24 bit), 128 kb/s (default)
Metadata:
creation_time : 2021-11-19T04:54:24.000000Z
handler_name : SoundHandler
encoder : Lavc58.96.100 aac
frame= 901 fps= 60 q=-1.0 Lsize= 99089kB time=00:00:15.01 bitrate=54048.5kbits/s speed= 1x
video:98829kB audio:235kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.024975%
[libx264 @ 000001f24216e180] frame I:7 Avg QP:27.22 size:382635
[libx264 @ 000001f24216e180] frame P:276 Avg QP:29.78 size:217960
[libx264 @ 000001f24216e180] frame B:618 Avg QP:33.24 size: 62079
[libx264 @ 000001f24216e180] consecutive B-frames: 8.4% 0.2% 0.3% 91.0%
[libx264 @ 000001f24216e180] mb I I16..4: 2.8% 85.3% 11.8%
[libx264 @ 000001f24216e180] mb P I16..4: 1.2% 24.3% 3.5% P16..4: 28.1% 25.0% 14.0% 0.0% 0.0% skip: 3.8%
[libx264 @ 000001f24216e180] mb B I16..4: 0.0% 0.8% 0.2% B16..8: 44.2% 12.3% 4.1% direct: 6.9% skip:31.5% L0:38.4% L1:37.0% BI:24.7%
[libx264 @ 000001f24216e180] 8x8 transform intra:83.3% inter:52.4%
[libx264 @ 000001f24216e180] coded y,uvDC,uvAC intra: 83.2% 82.7% 23.4% inter: 33.1% 24.3% 1.9%
[libx264 @ 000001f24216e180] i16 v,h,dc,p: 13% 49% 7% 31%
[libx264 @ 000001f24216e180] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 13% 22% 14% 6% 8% 8% 11% 8% 10%
[libx264 @ 000001f24216e180] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 21% 11% 7% 11% 10% 11% 7% 7%
[libx264 @ 000001f24216e180] i8c dc,h,v,p: 55% 16% 22% 7%
[libx264 @ 000001f24216e180] Weighted P-Frames: Y:5.1% UV:2.9%
[libx264 @ 000001f24216e180] ref P L0: 60.6% 17.4% 18.7% 3.2% 0.1%
[libx264 @ 000001f24216e180] ref B L0: 96.2% 3.2% 0.5%
[libx264 @ 000001f24216e180] ref B L1: 99.0% 1.0%
[libx264 @ 000001f24216e180] kb/s:53913.39
[aac @ 000001f242170dc0] Qavg: 235.206
運行 ffmpeg 命令后，我想保存以下行
Lsize= 99089kB time=00:00:15.01 bitrate=54048.5kbits/s speed= 1x
bash 變數，以便我稍后可以在腳本中使用此資訊。是否可以？
我試圖用x=$(ffmpeg ...)語法來做，但之后變數是空的
uj5u.com熱心網友回復：
嘗試這樣的事情：
x=$(ffmpeg... 2>&1 | grep -Eo 'Lsize=.*$')
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