Question

我想将3个mp4文件连接成1个。这是我制作的ffmpeg命令：

shell_exec('ffmpeg -f concat -i '.$random.'.txt -c:v libx264 -preset ultrafast -crf 30 -c:a copy '.$uploadfolder.$random.'.mp4 2>&1');

第1和第3个文件是入口和结束图形场景，它们具有以上信息：

pinicial.mp4

ffprobe version N-76417-gee20354 Copyright (c) 2007-2015 the FFmpeg developers
built with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
configuration: --prefix=/home/dmarcos89/ffmpeg_build --extra-cflags=-I/home/dmarcos89/ffmpeg_build/include --extra-ldflags=-L/home/dmarcos89/ffmpeg_build/lib --bindir=/usr/local/bin --pkg-config-flags=--static --enable-gpl --enable-nonfree --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265
libavutil      55.  5.100 / 55.  5.100
libavcodec     57. 13.102 / 57. 13.102
libavformat    57. 13.100 / 57. 13.100
libavdevice    57.  0.100 / 57.  0.100
libavfilter     6. 14.101 /  6. 14.101
libswscale      4.  0.100 /  4.  0.100
libswresample   2.  0.100 /  2.  0.100
libpostproc    54.  0.100 / 54.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'http://filtremoscolombia.com/test/videos/placas/pinicio.mp4':
Metadata:
major_brand     : isom
minor_version   : 512
compatible_brands: isomiso2avc1mp41
encoder         : Lavf57.13.100
Duration: 00:00:03.14, start: 0.021333, bitrate: 413 kb/s
Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 367 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
Metadata:
handler_name    : VideoHandler
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 43 kb/s (default)
Metadata:
handler_name    : SoundHandler

pfinal.mp4

ffprobe version N-76417-gee20354 Copyright (c) 2007-2015 the FFmpeg developers
  built with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  configuration: --prefix=/home/dmarcos89/ffmpeg_build --extra-cflags=-I/home/dmarcos89/ffmpeg_build/include --extra-ldflags=-L/home/dmarcos89/ffmpeg_build/lib --bindir=/usr/local/bin --pkg-config-flags=--static --enable-gpl --enable-nonfree --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265
  libavutil      55.  5.100 / 55.  5.100
  libavcodec     57. 13.102 / 57. 13.102
  libavformat    57. 13.100 / 57. 13.100
  libavdevice    57.  0.100 / 57.  0.100
  libavfilter     6. 14.101 /  6. 14.101
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.100 /  2.  0.100
  libpostproc    54.  0.100 / 54.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'http://filtremoscolombia.com/test/videos/placas/pfinal.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.13.100
  Duration: 00:00:03.99, start: 0.021333, bitrate: 612 kb/s
    Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 576 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 39 kb/s (default)
    Metadata:
      handler_name    : SoundHandler

＆＃34;中间＆＃34;之一：

ffprobe version N-76417-gee20354 Copyright (c) 2007-2015 the FFmpeg developers
built with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
configuration: --prefix=/home/dmarcos89/ffmpeg_build --extra-cflags=-I/home/dmarcos89/ffmpeg_build/include --extra-ldflags=-L/home/dmarcos89/ffmpeg_build/lib --bindir=/usr/local/bin --pkg-config-flags=--static --enable-gpl --enable-nonfree --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265
libavutil      55.  5.100 / 55.  5.100
libavcodec     57. 13.102 / 57. 13.102
libavformat    57. 13.100 / 57. 13.100
libavdevice    57.  0.100 / 57.  0.100
libavfilter     6. 14.101 /  6. 14.101
libswscale      4.  0.100 /  4.  0.100
libswresample   2.  0.100 /  2.  0.100
libpostproc    54.  0.100 / 54.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'http://filtremoscolombia.com/test/upload/videos/vC6RvCf4pn.mp4':
Metadata:
major_brand     : isom
minor_version   : 512
compatible_brands: isomiso2avc1mp41
encoder         : Lavf57.13.100
Duration: 00:00:16.90, start: 0.000000, bitrate: 1185 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x352 [SAR 1:1 DAR 20:11], 733 kb/s, 29.96 fps, 30 tbr, 15360 tbn, 60 tbc (default)
Metadata:
handler_name    : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, 5.1, fltp, 447 kb/s (default)
Metadata:
handler_name    : SoundHandler

结果如下：

ffprobe version N-76417-gee20354 Copyright (c) 2007-2015 the FFmpeg developers
built with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
configuration: --prefix=/home/dmarcos89/ffmpeg_build --extra-cflags=-I/home/dmarcos89/ffmpeg_build/include --extra-ldflags=-L/home/dmarcos89/ffmpeg_build/lib --bindir=/usr/local/bin --pkg-config-flags=--static --enable-gpl --enable-nonfree --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265
libavutil      55.  5.100 / 55.  5.100
libavcodec     57. 13.102 / 57. 13.102
libavformat    57. 13.100 / 57. 13.100
libavdevice    57.  0.100 / 57.  0.100
libavfilter     6. 14.101 /  6. 14.101
libswscale      4.  0.100 /  4.  0.100
libswresample   2.  0.100 /  2.  0.100
libpostproc    54.  0.100 / 54.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'http://filtremoscolombia.com/test/upload/videos/lYF00bMR2p.mp4':
Metadata:
major_brand     : isom
minor_version   : 512
compatible_brands: isomiso2avc1mp41
encoder         : Lavf57.13.100
Duration: 00:00:24.05, start: 0.000000, bitrate: 2121 kb/s
Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1793 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
Metadata:
handler_name    : VideoHandler
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 327 kb/s (default)
Metadata:
handler_name    : SoundHandler

这是视频本身：http://filtremoscolombia.com/test/upload/videos/lYF00bMR2p.mp4

音频没有很好地同步，音频也比原始文件快... 任何帮助都会很棒

Answer 1

concat demuxer使用第一个输入的时基，不会重新调整第二个和更多输入的PTS。因此，中间文件的音频（44.1 KHz）正在加速，因为输出音频时基是1/48000。

重新编码中间以匹配输入视频或条目＆amp;结束与中间匹配的视频，然后运行concat。

如果重新编码中间：

ffmpeg -i vC6RvCf4pn.mp4 -crf 18 -vf scale=1280x720,setsar=1 -profile:v baseline -ar 48000 -strict -2 new-middle.mp4

ffmpeg将视频与未同步的音频连接起来

1 个答案: