我对ffmpeg很陌生，所以我有点挣扎。
我找到了一种方法，可以使用以下代码将 4 个视频合并到一个并排的视频网格（2x2）中：
ffmpeg -y -i vid1.mp4 -i vid2.mp4 -i vid3.mp4 -i vid4.mp4 -filter_complex "[0:0]pad=iw*2:ih*2[a];[1:0]null[b];[2:0]null[c];[3:0]null[d];[a][b]overlay=w[x];[x][c]overlay=0:h[y];[y][d]overlay=w:h" multiple_input_grid.mp4
我想做的是按如下方式分发每个视频的音频
- 从 vid1 到音轨 1 的音频 -> 左声道
- 从 vid2 到音轨 1 的音频 -> 右声道
- 从 vid3 到音轨 2 的音频 -> 左声道
- 从 vid4 到音轨 2 的音频 -> 右声道
所以 multiple_input_grid.mp4 将有 2 个具有不同左/右音频的音轨
有没有办法在ffmpeg中做到这一点？
谢谢
我正在使用的命令（这应该有 4 个不同的来源，但有 4 个相同的来源）：
C:\Users\Gijs\Documents\ffmpeg-20130820-git-68b63a3-win64-static\bin>ffmpeg -y -
i VIDEO0050.mp4 -i VIDEO0050.mp4 -i VIDEO0050.mp4 -i VIDEO0050.mp4 -filter_compl
ex "[0:0]pad=iw*2:ih*2[a];[1:0]null[b];[2:0]null[c];[3:0]null[d];[a][b]overlay=w
[x];[x][c]overlay=0:h[y];[y][d]overlay=w:h" multiple_input_grid.mp4
输出：
ffmpeg version N-55644-g68b63a3 Copyright (c) 2000-2013 the FFmpeg developers
built on Aug 19 2013 20:32:00 with gcc 4.7.3 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
enable-libxvid --enable-zlib
libavutil 52. 42.100 / 52. 42.100
libavcodec 55. 28.100 / 55. 28.100
libavformat 55. 13.103 / 55. 13.103
libavdevice 55. 3.100 / 55. 3.100
libavfilter 3. 82.100 / 3. 82.100
libswscale 2. 5.100 / 2. 5.100
libswresample 0. 17.103 / 0. 17.103
libpostproc 52. 3.100 / 52. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'VIDEO0050.mp4':
Metadata:
major_brand : isom
minor_version : 0
compatible_brands: isom3gp4
creation_time : 2013-08-13 13:32:27
Duration: 00:00:28.35, start: 0.000000, bitrate: 5298 kb/s
Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yu
v420p, 720x1280, 5001 kb/s, SAR 65536:65536 DAR 9:16, 29.40 fps, 30.17 tbr, 90k
tbn, 180k tbc
Metadata:
creation_time : 2013-08-13 13:32:27
handler_name : VideoHandle
Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 95 k
b/s
Metadata:
creation_time : 2013-08-13 13:32:27
handler_name : SoundHandle
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'VIDEO0050.mp4':
Metadata:
major_brand : isom
minor_version : 0
compatible_brands: isom3gp4
creation_time : 2013-08-13 13:32:27
Duration: 00:00:28.35, start: 0.000000, bitrate: 5298 kb/s
Stream #1:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yu
v420p, 720x1280, 5001 kb/s, SAR 65536:65536 DAR 9:16, 29.40 fps, 30.17 tbr, 90k
tbn, 180k tbc
Metadata:
creation_time : 2013-08-13 13:32:27
handler_name : VideoHandle
Stream #1:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 95 k
b/s
Metadata:
creation_time : 2013-08-13 13:32:27
handler_name : SoundHandle
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'VIDEO0050.mp4':
Metadata:
major_brand : isom
minor_version : 0
compatible_brands: isom3gp4
creation_time : 2013-08-13 13:32:27
Duration: 00:00:28.35, start: 0.000000, bitrate: 5298 kb/s
Stream #2:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yu
v420p, 720x1280, 5001 kb/s, SAR 65536:65536 DAR 9:16, 29.40 fps, 30.17 tbr, 90k
tbn, 180k tbc
Metadata:
creation_time : 2013-08-13 13:32:27
handler_name : VideoHandle
Stream #2:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 95 k
b/s
Metadata:
creation_time : 2013-08-13 13:32:27
handler_name : SoundHandle
Input #3, mov,mp4,m4a,3gp,3g2,mj2, from 'VIDEO0050.mp4':
Metadata:
major_brand : isom
minor_version : 0
compatible_brands: isom3gp4
creation_time : 2013-08-13 13:32:27
Duration: 00:00:28.35, start: 0.000000, bitrate: 5298 kb/s
Stream #3:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yu
v420p, 720x1280, 5001 kb/s, SAR 65536:65536 DAR 9:16, 29.40 fps, 30.17 tbr, 90k
tbn, 180k tbc
Metadata:
creation_time : 2013-08-13 13:32:27
handler_name : VideoHandle
Stream #3:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 95 k
b/s
Metadata:
creation_time : 2013-08-13 13:32:27
handler_name : SoundHandle
[libx264 @ 0000000002788fc0] using SAR=1/1
[libx264 @ 0000000002788fc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
AVX
[libx264 @ 0000000002788fc0] profile High, level 5.0
[libx264 @ 0000000002788fc0] 264 - core 135 r2345 f0c1c53 - H.264/MPEG-4 AVC cod
ec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 r
ef=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_pski
p=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 deci
mate=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=2
5 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.6
0 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'multiple_input_grid.mp4':
Metadata:
major_brand : isom
minor_version : 0
compatible_brands: isom3gp4
encoder : Lavf55.13.103
Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1440x2
560 [SAR 1:1 DAR 9:16], q=-1--1, 11584 tbn, 30.17 tbc
Stream #0:1(eng): Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 44100
Hz, mono, s16, 128 kb/s
Metadata:
creation_time : 2013-08-13 13:32:27
handler_name : SoundHandle
Stream mapping:
Stream #0:0 (h264) -> pad (graph 0)
Stream #1:0 (h264) -> null (graph 0)
Stream #2:0 (h264) -> null (graph 0)
Stream #3:0 (h264) -> null (graph 0)
overlay (graph 0) -> Stream #0:0 (libx264)
Stream #0:1 -> #0:1 (aac -> libvo_aacenc)
Press [q] to stop, [?] for help
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frame= 850 fps= 11 q=29.0 size= 25971kB time=-577014:-32:-22.-77 bitrate=N/A
frame= 850 fps= 10 q=-1.0 Lsize= 27415kB time=00:00:28.37 bitrate=7915.7kbits
/s dup=21 drop=0
video:26940kB audio:444kB subtitle:0 global headers:0kB muxing overhead 0.113344
%
[libx264 @ 0000000002788fc0] frame I:4 Avg QP:20.92 size:166382
[libx264 @ 0000000002788fc0] frame P:246 Avg QP:23.11 size: 60370
[libx264 @ 0000000002788fc0] frame B:600 Avg QP:26.45 size: 20116
[libx264 @ 0000000002788fc0] consecutive B-frames: 4.2% 1.9% 9.2% 84.7%
[libx264 @ 0000000002788fc0] mb I I16..4: 12.5% 73.1% 14.4%
[libx264 @ 0000000002788fc0] mb P I16..4: 1.9% 3.4% 0.5% P16..4: 55.6% 14.5
% 7.5% 0.0% 0.0% skip:16.6%
[libx264 @ 0000000002788fc0] mb B I16..4: 0.2% 0.3% 0.1% B16..8: 43.8% 3.9
% 0.8% direct: 2.9% skip:48.0% L0:50.7% L1:46.7% BI: 2.6%
[libx264 @ 0000000002788fc0] 8x8 transform intra:60.5% inter:79.4%
[libx264 @ 0000000002788fc0] coded y,uvDC,uvAC intra: 50.1% 56.3% 11.6% inter: 1
4.5% 16.6% 0.1%
[libx264 @ 0000000002788fc0] i16 v,h,dc,p: 35% 23% 12% 31%
[libx264 @ 0000000002788fc0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 15% 25% 6% 4%
5% 4% 9% 5%
[libx264 @ 0000000002788fc0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 37% 14% 13% 6% 6%
7% 4% 8% 4%
[libx264 @ 0000000002788fc0] i8c dc,h,v,p: 61% 14% 21% 3%
[libx264 @ 0000000002788fc0] Weighted P-Frames: Y:2.8% UV:2.0%
[libx264 @ 0000000002788fc0] ref P L0: 58.0% 6.9% 26.5% 8.4% 0.1%
[libx264 @ 0000000002788fc0] ref B L0: 86.3% 10.7% 3.0%
[libx264 @ 0000000002788fc0] ref B L1: 93.4% 6.6%
[libx264 @ 0000000002788fc0] kb/s:7832.26
