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Content for FAQ of CMAF-IF website #1

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krasimirkolarov opened this issue Sep 25, 2020 · 3 comments
Open

Content for FAQ of CMAF-IF website #1

krasimirkolarov opened this issue Sep 25, 2020 · 3 comments

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@krasimirkolarov
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Please suggest ideas for first round of FAQs entries to be included on the new upcoming CMAF-IF website

@mbergman42
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Here's a few to get started:

  1. Why is CMAF important for those streaming content?
  2. Why is CMAF important for those building devices to play content?
  3. What resources exist if you are just getting started?
  4. Can CMAF handle captions?
  5. What is the difference between CMAF and ISO BMFF?
  6. Can I do low latency applications with CMAF?
  7. What’s the difference between fragments, chunks, and segments, and why have all these options?
  8. How does CMAF handle metadata?
  9. How does CMAF handle HDR?
  10. How does CMAF handle difference codecs, especially non-MPEG ones?
  11. How does CMAF handle changing resolutions?
  12. What’s the big deal with handling local ad insertion?

@johnsim
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johnsim commented Oct 4, 2020

  • What is the MIME type for CMAF? (audio/mp4, video/mp4, application/mp4)
  • Do the Media Source Extensions support CMAF? (yes and no - ongoing discussion about MSE IsTypeSupported() and the profiles parameter, differentiating ISO BMFF from CMAF without having a unique MIME type)
  • How do I find out which codecs are supported with CMAF? (location of CMAF Media Profile Specifications, WAVE process for media profile approval)
  • I understand both HLS and DASH support the use of CMAF. Are their constraints that need to be followed when using CMAF to ensure HLS-DASH Interop? (the DASH-HLS Interop Spec under development in WAVE)
  • [a whole category of CMAF questions relating to DASH, HLS Interop]

@mikedo
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mikedo commented Oct 4, 2020

For John's 3rd bullet, I suggest this: http://mp4ra.org/#/search and type in "CMAF". All CMAF Media Profile 4CC have to be registered and it includes the defining document.

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