Hi,
I convert my home videos from *.mts to *.mp4 using ffmpeg:
ffmpeg -i input.mts -map_metadata 0 -c:v copy -c:a libfdk_aac -vbr 5 output.mp4
Unfotunately -map_metadata does not help a lot. The *.mts files have a DateTimeOriginal tag but no CreateDate tag.
The resulting *.mp4 files have CreateDate: 0000:00:00 00:00:00 but no DateTimeOriginal.
So my question is: Does ffmpeg write this "CreateDate: 0000:00:00 00:00:00" or does exiftool show me this tag because it is expected but not present in a mp4 container ?
Situation stays the same if I don't use the -map_metadata option.
Kind regards
fotoschubser
If exiftool shows you a tag, that means the tag is present. It will, however usually format the tag content. Use the -n command line option or add a # after the tag name to get the unformatted value.
I have seen this before -- video equipment or software that writes zero date/time values to MP4 files.
- Phil