Re: [FFmpeg-trac] #6103(undetermined:new): When trying to set the audio track metadata language to 'und' (undefined) ffmpeg switches to 'eng' (English)

[FFmpeg]

#6103: When trying to set the audio track metadata language to 'und' (undefined)
ffmpeg switches to 'eng' (English)
-+-
 Reporter:  vsanchez |Owner:
 Type:  defect   |   Status:  new
 Priority:  normal   |Component:
  Version:  unspecified  |  undetermined
 Keywords:  metadata |   Resolution:
 Blocking:   |   Blocked By:
Analyzed by developer:  0|  Reproduced by developer:  0
-+-

Comment (by peter_b):

 Oh... :(

 Why is that so?

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Re: [FFmpeg-trac] #6103(undetermined:new): When trying to set the audio track metadata language to 'und' (undefined) ffmpeg switches to 'eng' (English)

[FFmpeg]

#6103: When trying to set the audio track metadata language to 'und' (undefined)
ffmpeg switches to 'eng' (English)
-+-
 Reporter:  vsanchez |Owner:
 Type:  defect   |   Status:  new
 Priority:  normal   |Component:
  Version:  unspecified  |  undetermined
 Keywords:  metadata |   Resolution:
 Blocking:   |   Blocked By:
Analyzed by developer:  0|  Reproduced by developer:  0
-+-

Comment (by Gyan):

 See the code in the fn below, before the 3*5 is returned.

 {{{
 if (!mp4)
 return -1;
 }}}

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Re: [FFmpeg-trac] #6103(undetermined:new): When trying to set the audio track metadata language to 'und' (undefined) ffmpeg switches to 'eng' (English)

[FFmpeg]

#6103: When trying to set the audio track metadata language to 'und' (undefined)
ffmpeg switches to 'eng' (English)
-+-
 Reporter:  vsanchez |Owner:
 Type:  defect   |   Status:  new
 Priority:  normal   |Component:
  Version:  unspecified  |  undetermined
 Keywords:  metadata |   Resolution:
 Blocking:   |   Blocked By:
Analyzed by developer:  0|  Reproduced by developer:  0
-+-

Comment (by peter_b):

 @Gyan:
 I'm surprised to hear that, because from a quick look at
 [https://github.com/FFmpeg/FFmpeg/blob/master/libavformat/isom.c
 libavformat/isom.c], I thought that the static codes-table is deprecated
 and replaced by ISO639-2 stored in 3*5 bits ASCII (as written in
 
[https://developer.apple.com/library/archive/documentation/QuickTime/QTFF/QTFFChap4/qtff4.html#//apple_ref/doc/uid/TP4939-CH206-35103
 MOV-specs]):

 /* map numeric codes from mdhd atom to ISO 639 */
 /* cf. QTFileFormat.pdf p253, qtff.pdf p205 */
 /* http://developer.apple.com/documentation/mac/Text/Text-368.html */
 /* deprecated by putting the code as 3*5 bits ASCII */

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Re: [FFmpeg-trac] #6103(undetermined:new): When trying to set the audio track metadata language to 'und' (undefined) ffmpeg switches to 'eng' (English)

[FFmpeg]

#6103: When trying to set the audio track metadata language to 'und' (undefined)
ffmpeg switches to 'eng' (English)
-+-
 Reporter:  vsanchez |Owner:
 Type:  defect   |   Status:  new
 Priority:  normal   |Component:
  Version:  unspecified  |  undetermined
 Keywords:  metadata |   Resolution:
 Blocking:   |   Blocked By:
Analyzed by developer:  0|  Reproduced by developer:  0
-+-

Comment (by Gyan):

 For MOV, FFmpeg restricts itself to the Macintosh Script Manager codes.
 ISO639-2 isn't used. There is a valid code for Undeclared (0x7FFF) which
 isn't implemented.

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Re: [FFmpeg-trac] #6103(undetermined:new): When trying to set the audio track metadata language to 'und' (undefined) ffmpeg switches to 'eng' (English)

[FFmpeg]

#6103: When trying to set the audio track metadata language to 'und' (undefined)
ffmpeg switches to 'eng' (English)
-+-
 Reporter:  vsanchez |Owner:
 Type:  defect   |   Status:  new
 Priority:  normal   |Component:
  Version:  unspecified  |  undetermined
 Keywords:  metadata |   Resolution:
 Blocking:   |   Blocked By:
Analyzed by developer:  0|  Reproduced by developer:  0
-+-

Comment (by peter_b):

 btw: In order to rule out syntax issues, I've also tested it with
 "language=ger" (German) and "language=fra" (French). These languages work
 as expected.

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Re: [FFmpeg-trac] #6103(undetermined:new): When trying to set the audio track metadata language to 'und' (undefined) ffmpeg switches to 'eng' (English)

[FFmpeg]

#6103: When trying to set the audio track metadata language to 'und' (undefined)
ffmpeg switches to 'eng' (English)
-+-
 Reporter:  vsanchez |Owner:
 Type:  defect   |   Status:  new
 Priority:  normal   |Component:
  Version:  unspecified  |  undetermined
 Keywords:  metadata |   Resolution:
 Blocking:   |   Blocked By:
Analyzed by developer:  0|  Reproduced by developer:  0
-+-

Comment (by peter_b):

 Just ran into the same thing.
 btw: This issue also affects other "less common"
 [https://en.wikipedia.org/wiki/List_of_ISO_639-2_codes ISO639-2 codes]
 like
 "[https://www.loc.gov/standards/iso639-2/php/langcodes_name.php?code_ID=367
 qaa-qtz] (=Reserved for local use)" or
 "[https://www.loc.gov/standards/iso639-2/php/langcodes_name.php?code_ID=504
 zxx] (=No linguistic content)" for example.


 Here's a commandline and the complete, uncut console output for
 reproduction:

 {{{
 $ ffmpeg -y -f lavfi -i "sine=frequency=1000:duration=1" -c:a pcm_s16le
 -metadata:s:a:0 language=und delme.mov
 }}}

 {{{
 ffmpeg version N-92314-g323c2cf Copyright (c) 2000-2018 the FFmpeg
 developers
   built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
   configuration: --prefix=/usr/local --enable-gpl --enable-nonfree
 --enable-version3 --enable-postproc --enable-ffplay --enable-swscale
 --enable-avfilter --enable-pthreads --enable-bzlib --enable-zlib --enable-
 decoder=png --enable-encoder=png --samples=../fate-suite --enable-
 libfreetype --enable-libopenjpeg --disable-decoder=jpeg2000 --enable-
 libvpx --enable-libvorbis --enable-libx264 --enable-libx265
   libavutil  56. 21.100 / 56. 21.100
   libavcodec 58. 34.100 / 58. 34.100
   libavformat58. 19.102 / 58. 19.102
   libavdevice58.  4.106 / 58.  4.106
   libavfilter 7. 39.100 /  7. 39.100
   libswscale  5.  2.100 /  5.  2.100
   libswresample   3.  2.100 /  3.  2.100
   libpostproc55.  2.100 / 55.  2.100
 Input #0, lavfi, from 'sine=frequency=1000:duration=1':
   Duration: N/A, start: 0.00, bitrate: 705 kb/s
 Stream #0:0: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (pcm_s16le (native) -> pcm_s16le (native))
 Press [q] to stop, [?] for help
 Output #0, mov, to 'delme.mov':
   Metadata:
 encoder : Lavf58.19.102
 Stream #0:0(und): Audio: pcm_s16le (sowt / 0x74776F73), 44100 Hz,
 mono, s16, 705 kb/s
 Metadata:
   encoder : Lavc58.34.100 pcm_s16le
 [Parsed_sine_0 @ 0x3aec580] EOF timestamp not reliable
 size=  87kB time=00:00:01.00 bitrate= 711.1kbits/s speed= 150x
 video:0kB audio:86kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.78%
 }}}


 Reading the resulting file shows "eng" (English) instead of "und"
 (Undetermined)

 {{{
 $ ffprobe-git -loglevel quiet -show_entries
 stream=index,codec_name,codec_type:stream_tags=language -i delme.mov
 }}}

 {{{
 [STREAM]
 index=0
 codec_name=pcm_s16le
 codec_type=audio
 TAG:language=eng
 [/STREAM]
 }}}

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