如何修复损坏的 MP4？

Question

我录制了不到一个小时的视频，但它似乎以某种方式损坏了。文件格式为h264 MP4，文件大小为2.3 GB，所以我相信信息在那里，只是文件格式已损坏。我怎么能解决它？

到目前为止，我已经尝试了一个简单的ffmpeg复制操作：

>ffmpeg -i video_28_07_2015_15_16_05.mp4  -c copy out.mp4
ffmpeg version N-73895-g323ec6b Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
  configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libdcadec --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvo-aacenc --enable-libvidstab
  libavutil      54. 28.100 / 54. 28.100
  libavcodec     56. 50.101 / 56. 50.101
  libavformat    56. 40.101 / 56. 40.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 25.100 /  5. 25.100
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.101 /  1.  2.101
  libpostproc    53.  3.100 / 53.  3.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x2a78e00] Could not find codec parameters for stream 0 (Video: h264 (avc1 / 0x31637661), none, 1280x720): unspecified pixel format
Consider increasing the value for the 'analyzeduration' and 'probesize' options
video_28_07_2015_15_16_05.mp4: could not find codec parameters
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video_28_07_2015_15_16_05.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 0
    compatible_brands: isom3gp4
    creation_time   : 2015-07-28 14:12:50
  Duration: 00:56:43.53, bitrate: 5345 kb/s
    Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), none, 1280x720, SAR 1:1 DAR 16:9, 30 fps, 90k tbr, 90k tbn, 180k tbc (default)
    Metadata:
      creation_time   : 2015-07-28 14:12:50
      handler_name    : VideoHandle
[mp4 @ 0x2a7b260] Codec for stream 0 does not use global headers but container format requires global headers
Output #0, mp4, to 'out.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 0
    compatible_brands: isom3gp4
    encoder         : Lavf56.40.101
    Stream #0:0(eng): Video: h264 ([33][0][0][0] / 0x0021), none, 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 30 fps, 90k tbr, 90k tbn, 90k tbc (default)
    Metadata:
      creation_time   : 2015-07-28 14:12:50
      handler_name    : VideoHandle
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
frame=    0 fps=0.0 q=-1.0 Lsize=       0kB time=00:00:00.00 bitrate=N/A    
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)

我不知道接下来要尝试什么，希望得到建议和指导。

Answer 1

好的，Federico Ponchio 的未截断工作成功了。过程（在 Ubuntu 14.04 LTS 上）如下：

sudo apt-get -y install libavformat-dev libavcodec-dev libavutil-dev
wget https://github.com/ponchio/untrunc/archive/master.zip
unzip master.zip
cd untrunc-master
g++ -o untrunc file.cpp main.cpp track.cpp atom.cpp mp4.cpp -L/usr/local/lib -lavformat -lavcodec -lavutil
./untrunc video_12_02_2015_15_02_58.mp4 video_28_07_2015_15_16_05.mp4

第一个参数是来自同一设备的示例工作视频，第二个参数是损坏的视频。该程序运行了很短的时间，并video_28_07_2015_15_16_05.mp4_fixed.mp4创建了一个名为的新工作文件。