我正在开发一个应用程序。 人们从其他地方上传手机中的视频。
在PHP中使用CMS（它是开发应用程序的语言）我需要使用这些部分上传来生成一个独特的视频。
通过FFmpeg我正在从命令行进行测试：
ffmpeg -i concat:IMG_1916.mp4\|IMG_1917.mp4 -c copy videoLoop.mp4
我运行时的代码说：
ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.4 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
libavutil 55. 34.101 / 55. 34.101
libavcodec 57. 64.101 / 57. 64.101
libavformat 57. 56.101 / 57. 56.101
libavdevice 57. 1.100 / 57. 1.100
libavfilter 6. 65.100 / 6. 65.100
libavresample 3. 1. 0 / 3. 1. 0
libswscale 4. 2.100 / 4. 2.100
libswresample 2. 3.100 / 2. 3.100
libpostproc 54. 1.100 / 54. 1.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f8515000000] Found duplicated MOOV Atom. Skipped it Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'concat:IMG_1916.mp4|IMG_1917.mp4':
Metadata:
encoder : Lavf57.66.102
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
Duration: 00:00:04.27, start: 0.000000, bitrate: 26792 kb/s
Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1920x1080, 11978 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 120 kb/s (default)
Metadata:
handler_name : SoundHandler
Output #0, mp4, to 'videoLoop.mp4':
Metadata:
compatible_brands: isomiso2avc1mp41
major_brand : isom
minor_version : 512
encoder : Lavf57.56.101
Stream #0:0(und): Video: h264 (Constrained Baseline) ([33][0][0][0] / 0x0021), yuv420p, 1920x1080, q=2-31, 11978 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 30k tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz, mono, 120 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 127 fps=0.0 q=-1.0 Lsize= 6264kB time=00:00:04.22 bitrate=12142.8kbits/s speed= 376x
video:6196kB audio:63kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.076698%
此执行生成视频，但不与指定的2连接，仅与第一个连接。
为什么不加入2？
要上传的视频格式会有很大差异，因此我无法定义编解码器。
答案 0 :(得分：2)
在连接之前，您必须使所有输入相似，然后使用concat filter。一个粗略的例子（你当然必须根据你的需要定制它）：
ffmpeg -i input0 -i input1 -filter_complex \
"[0:v]fps=25,scale=1280:720,format=yuv420p,setsar=1,setpts=PTS-STARTPTS[v0]; \
[1:v]fps=25,scale=1280:720,format=yuv420p,setsar=1,setpts=PTS-STARTPTS[v1]; \
[0:a]aformat=channel_layouts=stereo:sample_rates=44100,asetpts=PTS-STARTPTS[a0]; \
[1:a]aformat=channel_layouts=stereo:sample_rates=44100,asetpts=PTS-STARTPTS[a1]; \
[v0][a0][v1][a1]concat=n=2:v=1:a=1[v][a]" \
-map "[v]" -map "[a]" -c:v libx264 -c:a aac -movflags +faststart output.mp4
答案 1 :(得分：0)
使用这种代码调整，我可以生成一个包含两个源的视频。
ffmpeg -i IMG_1916.mp4 -i IMG_1917.mp4 \
-filter_complex \
"[0:v:0] [0:a:0] \
[1:v:0] [1:a:0] \
concat=n=2:v=1:a=1 [v] [a]" \
-map "[v]" -map "[a]" videoLoop.mp4
我不确定是否可以使用此代码从任何源/格式的任何设备连接任何视频格式。
答案 2 :(得分：0)
使用此代码，我可以毫无问题地创建视频连接。
/usr/bin/ffmpeg -i file1.mp4 -i file2.mp4 -filter_complex \
\"[0:v]fps=25,scale=1280:720,format=yuv420p,setsar=1,setpts=PTS-STARTPTS[v0]; \
[1:v]fps=25,scale=1280:720,format=yuv420p,setsar=1,setpts=PTS-STARTPTS[v1]; \
[0:a]aformat=channel_layouts=stereo:sample_rates=44100,asetpts=PTS-STARTPTS[a0]; \
[1:a]aformat=channel_layouts=stereo:sample_rates=44100,asetpts=PTS-STARTPTS[a1]; \
[v0][a0][v1][a1]concat=n=2:v=1:a=1[v][a]\" \
-map \"[v]\" -map \"[a]\" -c:v libx264 -c:a aac -movflags +faststart output.mp4
使用iPhone 6（MOV格式）加入录制的视频时，问题出现了。
执行失败，此消息“匹配无流”。
附上执行的输出：
array(52) {
[0]=>
string(107) "ffmpeg version 3.2.4-static http://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2017 the FFmpeg developers"
[1]=>
string(48) " built with gcc 5.4.1 (Debian 5.4.1-5) 20170205"
[2]=>
string(622) " 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"
[3]=>
string(40) " libavutil 55. 34.101 / 55. 34.101"
[4]=>
string(40) " libavcodec 57. 64.101 / 57. 64.101"
[5]=>
string(40) " libavformat 57. 56.101 / 57. 56.101"
[6]=>
string(40) " libavdevice 57. 1.100 / 57. 1.100"
[7]=>
string(40) " libavfilter 6. 65.100 / 6. 65.100"
[8]=>
string(40) " libswscale 4. 2.100 / 4. 2.100"
[9]=>
string(40) " libswresample 2. 3.100 / 2. 3.100"
[10]=>
string(40) " libpostproc 54. 1.100 / 54. 1.100"
[11]=>
string(115) "Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'videoLoop.mp4':"
[12]=>
string(11) " Metadata:"
[13]=>
string(26) " major_brand : isom"
[14]=>
string(25) " minor_version : 512"
[15]=>
string(39) " compatible_brands: isomiso2avc1mp41"
[16]=>
string(35) " encoder : Lavf57.56.101"
[17]=>
string(60) " Duration: 00:00:44.20, start: 0.000000, bitrate: 1761 kb/s"
[18]=>
string(154) " Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1630 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)"
[19]=>
string(13) " Metadata:"
[20]=>
string(36) " handler_name : VideoHandler"
[21]=>
string(101) " Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 124 kb/s (default)"
[22]=>
string(13) " Metadata:"
[23]=>
string(36) " handler_name : SoundHandler"
[24]=>
string(155) "Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '51180919245__617D354A-BB50-44AA-B7C1-2052F4EE49EF.MOV':"
[25]=>
string(11) " Metadata:"
[26]=>
string(24) " major_brand : qt"
[27]=>
string(23) " minor_version : 0"
[28]=>
string(25) " compatible_brands: qt"
[29]=>
string(49) " creation_time : 2017-03-21T17:13:12.000000Z"
[30]=>
string(35) " com.apple.quicktime.make: Apple"
[31]=>
string(39) " com.apple.quicktime.model: iPhone 6"
[32]=>
string(40) " com.apple.quicktime.software: 10.2.1"
[33]=>
string(62) " com.apple.quicktime.creationdate: 2017-03-21T18:13:12+0100"
[34]=>
string(59) " Duration: 00:00:11.38, start: 0.000000, bitrate: 714 kb/s"
[35]=>
string(168) " Stream #1:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m/bt709/bt709), 480x360, 700 kb/s, 28.31 fps, 600 tbr, 600 tbn, 1200 tbc (default)"
[36]=>
string(13) " Metadata:"
[37]=>
string(26) " rotate : 90"
[38]=>
string(51) " creation_time : 2017-03-21T17:13:12.000000Z"
[39]=>
string(47) " handler_name : Core Media Data Handler"
[40]=>
string(29) " encoder : H.264"
[41]=>
string(14) " Side data:"
[42]=>
string(47) " displaymatrix: rotation of -90.00 degrees"
[43]=>
string(70) " Stream #1:1(und): Data: none (mebx / 0x7862656D), 5 kb/s (default)"
[44]=>
string(13) " Metadata:"
[45]=>
string(51) " creation_time : 2017-03-21T17:13:12.000000Z"
[46]=>
string(47) " handler_name : Core Media Data Handler"
[47]=>
string(70) " Stream #1:2(und): Data: none (mebx / 0x7862656D), 0 kb/s (default)"
[48]=>
string(13) " Metadata:"
[49]=>
string(51) " creation_time : 2017-03-21T17:13:12.000000Z"
[50]=>
string(47) " handler_name : Core Media Data Handler"
[51]=>
string(491) "Stream specifier ':a' in filtergraph description [0:v]fps=25,scale=1280:720,format=yuv420p,setsar=1,setpts=PTS-STARTPTS[v0]; [1:v]fps=25,scale=1280:720,format=yuv420p,setsar=1,setpts=PTS-STARTPTS[v1]; [0:a]aformat=channel_layouts=stereo:sample_rates=44100,asetpts=PTS-STARTPTS[a0]; [1:a]aformat=channel_layouts=stereo:sample_rates=44100,asetpts=PTS-STARTPTS[a1]; [v0][a0][v1][a1]concat=n=2:v=1:a=1[v][a] matches no streams."
}
int(1)