> On Aug 4, 2015, at 9:28 AM, Kieran O'Leary <kieran.ole...@irishfilm.ie> wrote:
> 
> Hello,
> 
> Is there any way to add custom embedded metadata to a quicktime file via 
> ffmpeg? In particular, I am hoping to embed a unique ID into each file in our 
> collection, which would preferably show up in mediainfo/exiftool/ffprobe.

You could try:

ffmpeg -i  uncommented.mov -map 0 -c copy -metadata comment="your comments 
here" commented.mov

-map 0 will map all tracks from input #0
-c copy will state that all tracks should be copied rather than transcoded
And see around here for an idea of what metadata is supported in quicktime: 
http://git.videolan.org/?p=ffmpeg.git;a=blob;f=libavformat/mov.c;h=154d2f83f5819298d6dbd1107d35b27d192d2117;hb=HEAD#l269.

The output file may have other differences besides simply adding the metadata. 
It is demuxed then muxed again to a new file, so if the input contains atoms 
that are not understood by the muxer than they may be missing in the output. 
There are some other tools that allow editing in place on quicktime by junking 
the moov atom and appending a new one, perhaps 
http://www.omino.com/sw/qt_tools/man/qt_info.html or apple's automator.

> I know very little about this stuff, but I know that some AV/image file 
> formats are more flexible than others in this regard.

IMHO, Matroska would be more flexible for this than QuickTime.
Dave

> Any help would be greatly appreciated.
> 
> Best,
> 
> Kieran.
> 
> 
> 
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