-map_metadata fails in WinFF 1.4.2

dinkypumpkin dinkypumpkin at gmail.com
Fri Apr 20 09:31:07 EDT 2012

On 20/04/2012 13:03, bat guano wrote:
> It seems that get_iplayer with aactomp3 does a cracking job copying across the metadata, including cover art.

get_iplayer doesn't copy metadata via ffmpeg.  AFAICT, ffmpeg doesn't 
know how to extract the tags in the FLV file, so no metadata goes across 
during the conversion.  With --aactomp3, get_iplayer tags the file after 
the conversion like any other MP3, using the BBC metadata.

> However, when converting the m4a files to mp3 using WinFF, some of the metadata goes AWOL.

I've noticed this as for MP4->MP4 conversions as well.  I think you're 
limited by whatever the developers have elected to implement in ffmpeg, 
but haven't been energetic enough to crack open the relevant code to see 
what's going on.

> And the rest of it doesn't show properly in media players such as Windows Media Player and Total Recorder, though it looks impressive with MediaInfo program.

This is probably due to the fact that WinFF (via ffmpeg) will write 
id3v2.4 frames into the output file, but Windows Media Player can't read 
them - it can only read id3v2.3 frames (which is what get_iplayer 
produces).   I tried adding  -id3v2_version 3  to the ffmpeg command 
line, but even though it wrote id3v2.3 frames into the output file, WMP 
still couldn't read them.  So, there is some more investigation to be 
done.  Either version works OK in iTunes, Winamp, Foobar and VLC.  This 
is a peculiarity of WMP that has been known for a while.  Dunno about 
Total Recorder.

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