[FFmpeg-devel] [PATCH] avformat/id3v2enc: use UTF-16 in id3v2.3 APIC frame only if non-ASCII

Michael Niedermayer michaelni at gmx.at
Sun Aug 11 13:16:27 CEST 2013

On Sat, Aug 10, 2013 at 05:03:11PM -0700, Mark Harris wrote:
> This makes the encoding of picture descriptions consistent with the
> encoding of other text id3 tags and works better with iTunes, which
> does not display pictures with some UTF-16 picture descriptions
> (including a UTF-16 empty string, i.e. BOM + terminator).  It also
> saves a few bytes.
> Example:
>  ffmpeg -f lavfi -i sine=b=4 -f lavfi -i smptebars -map 0:a -map 1:v \
>    -codec:a libmp3lame -codec:v mjpeg -id3v2_version 3 \
>    -metadata:s:v comment="Cover (front)" -t 3 -y out.mp3
> This example does not set a picture description (-metadata:s:v title=)
> so an empty string is written in the id3v2.3 APIC frame.  Without this
> patch, UTF-16 is used and the cover art does not display in iTunes.
> With the patch the cover art is displayed.  (Note that iTunes does not
> display or have a way to set picture descriptions, only the picture
> itself, but nevertheless has trouble skipping some UTF-16 descriptions.)



Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Everything should be made as simple as possible, but not simpler.
-- Albert Einstein
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