CODEWITHSUNDEEP
videoffmpegcodecvideo-encoding
Adam Estel
Adam Estel

Reputation: 37

What is different between h.265/HEVC in a container(mp4, mkv....) and h.265/HEVC Annex B raw file?

What is different between h.264/HEVC in a container (mp4, mkv....) and h.265/HEVC Annex B raw file? I mean about codec, pixel formats and why can't hevc Annex B contain audio stream?

I researched google for a while but I couldn't understand it fully yet.

Upvotes: 2

Views: 3404

Answers (1)

szatmary
szatmary

Reputation: 31100

Annex B just a method of inserting separators (specifically, the byte sequence 000001) between chunks data to identify where decodable units or blocks begin and end. The byte sequence, called a start code, do not indicate anything about the data itself. So If you want to multiplex audio and video together, you must also add information to the start code to indicate whether the next chunk is audio or video. And in the case of multi track audio, what track it belongs to. And sense we already have a handful of container available, we don't need to create a new one. Annex B exists solely as a way for codec authors to create a standard output format that container authors can read to create full media files.

Upvotes: 1

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