FFMPEG-连接多个剪辑会产生损坏的输出(冻结视频,音频丢失,持续时间长)

时间:2020-03-03 14:44:56

标签: linux video ffmpeg merge concat

我正在尝试使用FFMPEG合并多个剪辑

我输入的视频具有以下详细信息:

  1. input1.mp4
ffprobe version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2007-2019 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
  configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input1.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.20.100
  Duration: 00:05:11.75, start: 0.000000, bitrate: 1338 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1204 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc. Created on: 11/09/2018.
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc. Created on: 11/09/2018.
  1. input2.mp4
ffprobe version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2007-2019 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
  configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input2.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.20.100
  Duration: 00:00:05.62, start: 0.000000, bitrate: 2479 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1260x720 [SAR 1:1 DAR 7:4], 2376 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, mono, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler

我尝试了2种方法,但似乎都无法正常工作。

方法1:使用ffmpeg concat过滤器

步骤:

ffmpeg -i input1.mp4 -qscale:v 1 intermediate1.mpg
ffmpeg -i input2.mp4 -qscale:v 1 intermediate2.mpg
cat intermediate1.mpg intermediate2.mpg > intermediate_all.mpg
ffmpeg -i intermediate_all.mpg -qscale:v 2 output.mp4

方法2:结合使用ffmpeg concat多路分配器和时基处理

步骤:

ffmpeg -i input1.mp4 -s hd720 -r 30000/1001 -video_track_timescale 30k -c:a copy input1-converted.mp4
ffmpeg -i input2.mp4 -s hd720 -r 30000/1001 -video_track_timescale 30k -c:a copy input2-converted.mp4
ffmpeg -f concat -safe 0 -i vidlist.txt -c copy output.mp4

参考文献:

期望:

一个包含两个输入的结果片段会以适当的长度(输入的总和)并没有视频冻结/音频丢失的情况下一个接一个地合并。

结果:

一个包含两个输入的合成剪辑会持续很长的时间(超过输入的总和),并且视频冻结,有时还会丢失音频。

2 个答案:

答案 0 :(得分:0)

您的输入必须具有相同的参数,但是您的输入的宽度,帧速率,时间比例,音频采样率和音频通道布局会有所不同。由于input1.mp4是主要功能,因此您可以重新编码input2.mp4以匹配input1.mp4的属性:

ffmpeg -i input2.mp4 -filter_complex "[0:v]pad=1280:720:-1:-1,fps=30000/1001[v];[0:a]aformat=sample_rates=44100:channel_layouts=stereo[a]" -map "[v]" -map "[a]" input2b.mp4

然后使用concat demuxer来连接它们。创建input.txt

file 'input1.mp4'
file 'input2b.mp4'

串联:

ffmpeg -f concat -i input.txt -c copy output.mp4
  • 这使input1.mp4保持不变:处理速度更快,并且保留了input1.mp4的质量。

  • 更好的是在设置适当的参数的同时从原始源重新创建新的input2.mp4。这样可以避免由于重新编码新文件而造成的生成损失。

答案 1 :(得分:0)

尝试

ffmpeg -i input1-converted.mp4 -i input2-converted.mp4 -filter_complex "concat=n=2:v=1:a=1" output.mp4

n = 2(输入)。

v = 1:每个视频有1个视频流。

a = 1每个视频有1个音频流。