Thanks for reporting your issue. Please make sure these boxes are checked before submitting your issue - thank you!

- [X] I looked for a similar issue and couldn't find any.
- [X] I tried with the latest version of GPAC. Installers available at http://gpac.io/downloads/gpac-nightly-builds/
- [X] I give enough information for contributors to reproduce my issue (meaningful title, github labels, platform and compiler, command-line ...). I can share files anonymously with this dropbox: https://www.mediafire.com/filedrop/filedrop_hosted.php?drop=eec9e058a9486fe4e99c33021481d9e1826ca9dbc242a6cfaab0fe95da5e5d95

Detailed guidelines: http://gpac.io/2013/07/16/how-to-file-a-bug-properly/

Hello:
I have one video without subtitle, its name: 13864_en.mp4; I have one English subtitle in SRT format: 13864_en.srt; I have yet another Chinese subtitle in SRT format: 13864_cn.srt.
I can make a video with English subtitle with the following simple command:
mp4box -add 13864_en.srt:hdlr=sbtl:lang=eng 13864_en.mp4 -out 13864_English.mp4
But when I tried to make a video with Chinese subtitle, none of my commands works.
The following is the log:

D:\Videos\Youtube>mp4box -for-test -add 13864_en.mp4#video -add '13864_cn.srt:lang=zh-Hans:name=Mandarin (Simplified)' -out 13864Chinese.mp4
IsoMedia import 13864_en.mp4 - track ID 1 - Video (size 1280 x 720)
[Importer] Cannot load filter for input file "'13864_cn.srt"
Failure while importing media: Requested URL is not valid or cannot be found
Error importing '13864_cn.srt:lang=zh-Hans:name=Mandarin: Requested URL is not valid or cannot be found

D:\Videos\Youtube>mp4box -for-test -add 13864_en.mp4#video -add '13864_cn.srt:lang=zh-Hans' -out 13864Chinese.mp4
Broken argument specifier or file name missing - check usage with -h

D:\Videos\Youtube>mp4box -for-test -add 13864_en.mp4#video -add '13864_cn.srt:lang=zh-CN' -out 13864Chinese.mp4
Broken argument specifier or file name missing - check usage with -h

D:\Videos\Youtube>mp4box -for-test -add 13864_en.mp4#video -add '13864_cn.srt:lang=zh-TW' -out 13864Chinese.mp4
Broken argument specifier or file name missing - check usage with -h

D:\Videos\Youtube>dir 13864*
 Volume in drive D is SATABackup
 Volume Serial Number is 4425-E62C

 Directory of D:\Videos\Youtube

07/02/2022  01:52 PM         8,204,487 13864Chinese.mp4
07/02/2022  01:32 PM         8,204,323 13864EN720P.mp4
07/02/2022  10:32 AM               122 13864_cn.srt
06/30/2022  01:45 PM         8,219,623 13864_en.mp4
06/30/2022  01:55 PM               136 13864_en.srt
               5 File(s)     24,628,691 bytes
               0 Dir(s)  449,866,760,192 bytes free

D:\Videos\Youtube>type 13864_en.srt
1
0:00:00,00 --> 0:00:30,233
Zelensky published a video of a Russian cruise missile hitting the AMSTOR shopping center in Kremenchug

D:\Videos\Youtube>type 13864_cn.srt
1
0:00:00 --> 0:00:29
µ│¢Þ┐×µû»Õƒ║ÕÅæÕ©âõ║åõ©Çµ«Áõ┐äþ¢ùµû»ÕÀíÞê¬Õ»╝Õ╝╣Õç╗õ©¡ÕàïÕêùÚù¿õ©ÿµá╝ AMSTOR Þ┤¡þë®õ©¡Õ┐âþÜäÞºåÚóæ
D:\Videos\Youtube>mp4box -add 13864_en.srt:hdlr=sbtl:lang=eng 13864_en.mp4 -out 13864_English.mp4
Track Importing Timed Text - Text track 1280 x 720 font Serif (size 18) layer 0
0.500 secs Interleaving

D:\Videos\Youtube>dir 13864_English.mp4
 Volume in drive D is SATABackup
 Volume Serial Number is 4425-E62C

 Directory of D:\Videos\Youtube

07/02/2022  02:09 PM         8,204,342 13864_English.mp4
               1 File(s)      8,204,342 bytes
               0 Dir(s)  449,858,551,808 bytes free

D:\Videos\Youtube>mp4box -add 13864_cn.srt:hdlr=sbtl:lang=zh-CN 13864_en.mp4 -out 13864_Chinese.mp4
Track Importing Timed Text - Text track 1280 x 720 font Serif (size 18) layer 0
[TXTIn] Error scanning SRT frame 1 timing
[TXTIn] Bad SRT formatting - expecting number got "µ│¢Þ┐×µû»Õƒ║ÕÅæÕ©âõ║åõ©Çµ«Áõ┐äþ¢ùµû»ÕÀíÞê¬Õ»╝Õ╝╣Õç╗õ©¡ÕàïÕêùÚù¿õ©ÿµá╝ AMSTOR Þ┤¡þë®õ©¡Õ┐âþÜäÞºåÚóæ"
0.500 secs Interleaving

D:\Videos\Youtube>mp4box -version
MP4Box - GPAC version 2.1-DEV-rev232-gfcaa01eb-master
(c) 2000-2022 Telecom Paris distributed under LGPL v2.1+ - http://gpac.io

Please cite our work in your research:
        GPAC Filters: https://doi.org/10.1145/3339825.3394929
        GPAC: https://doi.org/10.1145/1291233.1291452

GPAC Configuration: (static configuration file)
Features: GPAC_CONFIG_WIN32 GPAC_64_BITS GPAC_MEMORY_TRACKING GPAC_HAS_SSL GPAC_MINIMAL_ODF GPAC_HAS_QJS GPAC_HAS_FAAD GPAC_HAS_MAD GPAC_HAS_LIBA52 GPAC_HAS_JPEG GPAC_HAS_PNG GPAC_HAS_FFMPEG GPAC_HAS_OPENSVC GPAC_HAS_JP2 GPAC_HAS_OPENHEVC GPAC_HAS_THEORA GPAC_HAS_VORBIS GPAC_HAS_XVID GPAC_HAS_GLU

D:\Videos\Youtube>

Please advise on how to make burn Chinese subtitle into a .MP4 format video. I am using Windows 10 version 21H2, MP4box latest version: version 2.1-DEV-rev232-gfcaa01eb-master
Thanks,

How to burn subtitle in simplified Chinese into a video?
This is a GitHub Issue
repo:gpac
owner:gpac
Title : How to burn subtitle in simplified Chinese into a video?
Issue date:

--- start body ---
Thanks for reporting your issue. Please make sure these boxes are checked before submitting your issue - thank you!

- [X] I looked for a similar issue and couldn't find any.
- [X] I tried with the latest version of GPAC. Installers available at http://gpac.io/downloads/gpac-nightly-builds/
- [X] I give enough information for contributors to reproduce my issue (meaningful title, github labels, platform and compiler, command-line ...). I can share files anonymously with this dropbox: https://www.mediafire.com/filedrop/filedrop_hosted.php?drop=eec9e058a9486fe4e99c33021481d9e1826ca9dbc242a6cfaab0fe95da5e5d95

Detailed guidelines: http://gpac.io/2013/07/16/how-to-file-a-bug-properly/

Hello:
I have one video without subtitle, its name: 13864_en.mp4; I have one English subtitle in SRT format: 13864_en.srt; I have yet another Chinese subtitle in SRT format: 13864_cn.srt.
I can make a video with English subtitle with the following simple command:
mp4box -add 13864_en.srt:hdlr=sbtl:lang=eng 13864_en.mp4 -out 13864_English.mp4
But when I tried to make a video with Chinese subtitle, none of my commands works.
The following is the log:

D:\Videos\Youtube>mp4box -for-test -add 13864_en.mp4#video -add '13864_cn.srt:lang=zh-Hans:name=Mandarin (Simplified)' -out 13864Chinese.mp4
IsoMedia import 13864_en.mp4 - track ID 1 - Video (size 1280 x 720)
[Importer] Cannot load filter for input file "'13864_cn.srt"
Failure while importing media: Requested URL is not valid or cannot be found
Error importing '13864_cn.srt:lang=zh-Hans:name=Mandarin: Requested URL is not valid or cannot be found

D:\Videos\Youtube>mp4box -for-test -add 13864_en.mp4#video -add '13864_cn.srt:lang=zh-Hans' -out 13864Chinese.mp4
Broken argument specifier or file name missing - check usage with -h

D:\Videos\Youtube>mp4box -for-test -add 13864_en.mp4#video -add '13864_cn.srt:lang=zh-CN' -out 13864Chinese.mp4
Broken argument specifier or file name missing - check usage with -h

D:\Videos\Youtube>mp4box -for-test -add 13864_en.mp4#video -add '13864_cn.srt:lang=zh-TW' -out 13864Chinese.mp4
Broken argument specifier or file name missing - check usage with -h

D:\Videos\Youtube>dir 13864*
 Volume in drive D is SATABackup
 Volume Serial Number is 4425-E62C

 Directory of D:\Videos\Youtube

07/02/2022  01:52 PM         8,204,487 13864Chinese.mp4
07/02/2022  01:32 PM         8,204,323 13864EN720P.mp4
07/02/2022  10:32 AM               122 13864_cn.srt
06/30/2022  01:45 PM         8,219,623 13864_en.mp4
06/30/2022  01:55 PM               136 13864_en.srt
               5 File(s)     24,628,691 bytes
               0 Dir(s)  449,866,760,192 bytes free

D:\Videos\Youtube>type 13864_en.srt
1
0:00:00,00 --> 0:00:30,233
Zelensky published a video of a Russian cruise missile hitting the AMSTOR shopping center in Kremenchug

D:\Videos\Youtube>type 13864_cn.srt
1
0:00:00 --> 0:00:29
µ│¢Þ┐×µû»Õƒ║ÕÅæÕ©âõ║åõ©Çµ«Áõ┐äþ¢ùµû»ÕÀíÞê¬Õ»╝Õ╝╣Õç╗õ©¡ÕàïÕêùÚù¿õ©ÿµá╝ AMSTOR Þ┤¡þë®õ©¡Õ┐âþÜäÞºåÚóæ
D:\Videos\Youtube>mp4box -add 13864_en.srt:hdlr=sbtl:lang=eng 13864_en.mp4 -out 13864_English.mp4
Track Importing Timed Text - Text track 1280 x 720 font Serif (size 18) layer 0
0.500 secs Interleaving

D:\Videos\Youtube>dir 13864_English.mp4
 Volume in drive D is SATABackup
 Volume Serial Number is 4425-E62C

 Directory of D:\Videos\Youtube

07/02/2022  02:09 PM         8,204,342 13864_English.mp4
               1 File(s)      8,204,342 bytes
               0 Dir(s)  449,858,551,808 bytes free

D:\Videos\Youtube>mp4box -add 13864_cn.srt:hdlr=sbtl:lang=zh-CN 13864_en.mp4 -out 13864_Chinese.mp4
Track Importing Timed Text - Text track 1280 x 720 font Serif (size 18) layer 0
[TXTIn] Error scanning SRT frame 1 timing
[TXTIn] Bad SRT formatting - expecting number got "µ│¢Þ┐×µû»Õƒ║ÕÅæÕ©âõ║åõ©Çµ«Áõ┐äþ¢ùµû»ÕÀíÞê¬Õ»╝Õ╝╣Õç╗õ©¡ÕàïÕêùÚù¿õ©ÿµá╝ AMSTOR Þ┤¡þë®õ©¡Õ┐âþÜäÞºåÚóæ"
0.500 secs Interleaving

D:\Videos\Youtube>mp4box -version
MP4Box - GPAC version 2.1-DEV-rev232-gfcaa01eb-master
(c) 2000-2022 Telecom Paris distributed under LGPL v2.1+ - http://gpac.io

Please cite our work in your research:
        GPAC Filters: https://doi.org/10.1145/3339825.3394929
        GPAC: https://doi.org/10.1145/1291233.1291452

GPAC Configuration: (static configuration file)
Features: GPAC_CONFIG_WIN32 GPAC_64_BITS GPAC_MEMORY_TRACKING GPAC_HAS_SSL GPAC_MINIMAL_ODF GPAC_HAS_QJS GPAC_HAS_FAAD GPAC_HAS_MAD GPAC_HAS_LIBA52 GPAC_HAS_JPEG GPAC_HAS_PNG GPAC_HAS_FFMPEG GPAC_HAS_OPENSVC GPAC_HAS_JP2 GPAC_HAS_OPENHEVC GPAC_HAS_THEORA GPAC_HAS_VORBIS GPAC_HAS_XVID GPAC_HAS_GLU

D:\Videos\Youtube>

Please advise on how to make burn Chinese subtitle into a .MP4 format video. I am using Windows 10 version 21H2, MP4box latest version: version 2.1-DEV-rev232-gfcaa01eb-master
Thanks,

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