ffmpeg seems not creating standard compliance subtitle streams in MOV files

[Nick]

During some tests for ticket#2431 I noticed that subtitle streams with special characters in MOV files are not displayed correctly in VLC 2.0.6. Therefore I opened a ticket in VLC bug tracker (​ticket#8450).
(In other media players like SMPlayer and XBMC it works fine.)

My test files are encoded with command line:

ffmpeg -i input.mp4 -sub_charenc ISO-8859-1 -i subtitle_test.srt -map 0:v -map 0:a -c copy -map 1 -c:s:0 mov_text -metadata:s:s:0 language=ger output_imported_subtitle.mov

ffmpeg -i input.mp4 -sub_charenc ISO-8859-1 -i subtitle_test.srt -map 0:v -map 0:a -c copy -map 1 -c:s:0 mov_text -metadata:s:s:0 language=ger output_imported_subtitle.mp4

...using a Windows build of ffmpeg:
​http://ffmpeg.zeranoe.com/builds/win32/static/ffmpeg-20130418-git-ee94362-win32-static.7z

So far I know, for subtitles in "MOV" the "3GPP Timed Text specification" should be used!
See also:
​https://developer.apple.com/library/mac/#documentation/QuickTime/qtff/QTFFChap3/qtff3.html
​http://en.wikipedia.org/wiki/MPEG-4_Part_17
​http://mpeg.chiariglione.org/standards/mpeg-4/streaming-text-format
3GPP TS 26.245 Specification:
​http://www.3gpp.org/ftp/Specs/archive/26_series/26.245/26245-600.zip

Another problem for MP4 files was solved with VLC tracker ​ticket#8450 but for the initial problem with subtitle streams in MOV files I get as answer:
"[...] the file is not encoded correctly. The FFmpeg muxer must be at fault here."
and
"Your sample is NOT using 3GPP Timed Text."

In MP4 files created by ffmpeg I can found the subtitle mark "tx3g" (for "3GPP Timed Text") but in MOV files I cannot find this mark!
Does ffmpeg using a fully standard compliance format and mark for subtitle streams in MOV files?

tested also with the last build of VLC:
​http://nightlies.videolan.org/build/win32/vlc-2.1.0-20130420-0005/vlc-2.1.0-git-20130420-0005-win32.zip
(this build includes MP4 subtitle language code <0x400 detection bugfix already)

For more details see also:
​https://trac.videolan.org/vlc/ticket/8450

[Carl Eugen Hoyos]

Duplicate of ticket #1845.