On 4/10/2026 2:58 AM, Rys, Grzegorz wrote:

{ AV_CODEC_ID_JPEGXS      , 0x6F }, /* ISO/IEC 21122-3 */
0x6F is not yet defined when I look into 
https://mp4ra.org/registered-types/object-types
It is the next one after: 6E Visual ISO/IEC 15444-1 (JPEG 2000), so I hope 6F 
for JPEGXS is correct.

"I hope is correct" is not exactly reassuring...

Do i understand right that you don't have access to ISO/IEC 21122-3 to write this patch?


ISO/IEC 21122-3 is correct: https://mp4ra.org/references#JPXS

I cannot find any codec specific box for JPEGXS at: 
https://mp4ra.org/registered-types/codecs, look for: Box types contained in 
specific Sample Entries table.

That link says the sample entry should be jxsm, not "jxs " like you wrote it.

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