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MPEGGroup / CMAF

Official MPEG repository to discuss public issues on CMAF (ISO/IEC 23000-19)
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minimum fragment duration of 960 ms #19

Closed RufaelDev closed 2 years ago

RufaelDev commented 3 years ago

For low latency streaming, one of the options is using short CMAF fragments. Right now 1 second is defined as the minimum fragment duration in 7.3.2.4. 960 ms might be more suitable as for common framerates/sample rates you can achieve alignment of fragment boundaries for audio and video (e.g. 45 when 1024 per iso sample or 30 for 1536 per iso sample). DVB chose this value for its low latency specification using short independent segments and would like to align with cmaf framgnts if possible.

cconcolato commented 3 years ago

This refers to bullet point f) in 7.3.2.4. IIUC it is suggesting to replace "one second" with "960 ms".

cconcolato commented 2 years ago

FYI, I just checked the intermediate draft of the 3rd edition, and it still mentions "one second"

RufaelDev commented 2 years ago

Any chance to still correct this still or will this be kept as is ?

cconcolato commented 2 years ago

As discussed today, we have an agreement to make this change.

haudiobe commented 2 years ago

Addressed here: https://dms.mpeg.expert/doc_end_user/documents/137_OnLine/wg11/m58936-v2-m58936-Issues-r1.zip