parsing block duration

[Jonathan Yaniv]

I'm working on a ruby webm parser and would like to include the duration of each block in the output.

Don't see anything about block duration in the webm or matroska specs.

Any suggestions on how to capture this data?

FYI the parser is meant for inspecting data from the MediaRecorder API, concatenating the data, extracting EBML headers and top level elements, etc.

Thanks,

Jonathan

[James Zern]

Hi Jonathan,

On Tue, Jun 7, 2022 at 6:10 AM Jonathan Yaniv <yoni...@gmail.com> wrote:

I'm working on a ruby webm parser and would like to include the duration of each block in the output.

Don't see anything about block duration in the webm or matroska specs.

BlockDuration is an optional element [1] in most cases and not usually used except for the last block. The duration is generally derived from the difference between current and next block in display order.

[1] https://matroska.org/technical/elements.html#blockduration-element

Any suggestions on how to capture this data?

FYI the parser is meant for inspecting data from the MediaRecorder API, concatenating the data, extracting EBML headers and top level elements, etc.

Thanks,

Jonathan

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[Jonathan Yaniv]

Thanks James, in particular I was interested in the duration of the last block.

[James Zern]

On Tue, Jun 7, 2022 at 10:51 AM Jonathan Yaniv <yoni...@gmail.com> wrote:

Thanks James, in particular I was interested in the duration of the last block.

If the duration is written you can use that, otherwise you can try keeping a running average of the block durations or use the previous one as an approximation.