What is going on

Asked on 07/31/2024

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It looks like you're interested in understanding what is going on in the context of AVFoundation playback sessions. Here's a detailed explanation based on the provided context:

In the session titled "Discover media performance metrics in AVFoundation", the discussion focuses on diagnosing issues related to media playback stalls. Specifically, it describes a scenario where a stall occurs during media playback. Here's a breakdown of the events:

  1. Timeline Analysis: The timeline between minutes seven and eight shows a stall event.
  2. Event Inspection: Before the stall, AVPlayer is fetching media segments.
  3. HTTP 404 Errors: The video media segment returns an HTTP 404 error, leading to a variant switch from 20 megabits to 15 megabits.
  4. Buffer Depletion: After the variant switch, the new video media segment again returns an HTTP 404 error, causing AVPlayer to run out of buffer, resulting in the stall.
  5. NSURLSessionTaskMetrics: By accessing the media segment event, you can reference NSURLSessionTaskMetrics to get additional details on why the request failed, such as response headers and other network transaction details.

For more detailed information, you can watch the session Discover media performance metrics in AVFoundation (00:03:12).

Relevant Sessions

  1. Discover media performance metrics in AVFoundation
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If you have any more specific questions or need further details, feel free to ask!

Run, Break, Inspect: Explore effective debugging in LLDB

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