From: Vangelis forthnet Sent: Tuesday, August 29, 2017 01:03
On Thu Aug 24 13:12:07 BST 2017, I wrote:
What I still haven't worked out is whether there is an equivalent
of -codec copy for metadata.
... bit late, but maybe:
-map_metadata outfile[,metadata]:infile[,metadata]
=> "set metadata information of outfile from infile"
(switch found inside "Per-file main options" section of ffmpeg -h full
)
Thanks Vangelis, I think you have set me on the right track
with -map_metadata.
It seems what I want is
-map_metadata 0:g
where 0 is the first input stream and g is global, but they are the defaults
so I don't need to worry.
From the ffmpeg documentation of -map_metadata
"If metadata specifier is omitted, it defaults to global.
"By default, global metadata is copied from the first input file, per-stream
and per-chapter metadata is copied along with streams/chapters. These
default mappings are disabled by creating any mapping of the relevant type.
A negative file index can be used to create a dummy mapping that just
disables automatic copying. "
All I need to work out now from
https://lists.ffmpeg.org/pipermail/ffmpeg-cvslog/2011-August/039681.html
is why I would want to enable -write_id3v1 given that "ID3v1 tags are
written in UTF-8 which may not be supported by most software."
or what the difference is between -id3v2_version=3 and -id3v2_version=4
https://github.com/get-iplayer/get_iplayer/wiki/aactomp3
warns me I must not ask for help if I do not understand them!
It is probably easier just to leave them out and see if anything goes wrong.
Best wishes
Richard
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