如何提取MVIMG的照片/视频组件? [英] How to extract the Photo/Video component of a MVIMG?

问题描述

Google Pixel 2以及其他手机可能具有覆盖动态照片"的功能.这些被保存为MVIMG并且相对较大.

我正在寻找一种删除/提取视频的方法.

到目前为止，我发现了一个很有前途的exif标签

$ exiftool -xmp:all MVIMG_123.jpg
XMP Toolkit                     : Adobe XMP Core 5.1.0-jc003
Micro Video                     : 1
Micro Video Version             : 1
Micro Video Offset              : 4032524

我认为视频可能以指定的偏移量出现，但这不起作用:

$ dd if=MVIMG_123.jpg of=video.mp4 bs=4032524 skip=1
$ file video.mp4
video.mp4: data

是否有任何文献可以证明嵌入?甚至还有删除/提取视频的工具吗?

解决方案

我确实找到了 https://github.com/cliveontoast/GoMoPho 会扫描mp4标头，然后转储视频.

我们可以做同样的事情，从MP4头中扫描ftypmp4(实际文件比文件开头早4个字节):

因此提取视频:

for i in MVIMG*.jpg; do \
  ofs=$(grep -F --byte-offset --only-matching --text ftypmp4 "$i"); \
  ofs=${ofs%:*}; \
  [[ $ofs ]] && dd "if=$i" "of=${i%.jpg}.mp4" bs=$((ofs-4)) skip=1; \
done

并删除视频:

for i in MVIMG*.jpg; do \
  ofs=$(grep -F --byte-offset --only-matching --text ftypmp4 "$i"); \
  ofs=${ofs%:*}; \
  [[ $ofs ]] && truncate -s $((ofs-4)) "$i"; \
done

The Google Pixel 2 and probably other phones since have the capability to cover "Motion Photos". These are saved as MVIMG and comparatively big.

I’m looking for a way to remove/extract the video.

So far I found a promising exif tag

$ exiftool -xmp:all MVIMG_123.jpg
XMP Toolkit                     : Adobe XMP Core 5.1.0-jc003
Micro Video                     : 1
Micro Video Version             : 1
Micro Video Offset              : 4032524

I thought the video might be present at the specified offset, but this doesn’t work:

$ dd if=MVIMG_123.jpg of=video.mp4 bs=4032524 skip=1
$ file video.mp4
video.mp4: data

Are there any resources that document the embedding? Are there even any tools to remove/extract the video?

解决方案

I did find https://github.com/cliveontoast/GoMoPho which scans for the mp4 header and then dumps the video.

We can do the same, scanning for ftypmp4 from the MP4 header (actual file starts 4 bytes earlier):

Thus to extract videos:

for i in MVIMG*.jpg; do \
  ofs=$(grep -F --byte-offset --only-matching --text ftypmp4 "$i"); \
  ofs=${ofs%:*}; \
  [[ $ofs ]] && dd "if=$i" "of=${i%.jpg}.mp4" bs=$((ofs-4)) skip=1; \
done

And to remove videos:

for i in MVIMG*.jpg; do \
  ofs=$(grep -F --byte-offset --only-matching --text ftypmp4 "$i"); \
  ofs=${ofs%:*}; \
  [[ $ofs ]] && truncate -s $((ofs-4)) "$i"; \
done

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