Adaptive Bit Rate Ladders for Playback Interruptions
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Solution Overview
Problem
User devices lack awareness of the root cause of playback interruptions during content output, leading to suboptimal choices between switching to a different bit rate or server, which can result in unnecessary quality reduction or increased start time.
Innovation Solution
User devices determine the cause of playback interruptions through metrics collection and analysis, enabling informed decisions to switch to a different bit rate or server based on network conditions, and the content delivery network dynamically generates alternative bit rate ladders to optimize content delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the user device switches to a lower bit rate to avoid interruptions, then playback continuity is improved, but playback quality is reduced
Solution Approach 1:
The system implements feedback by monitoring playback interruptions and analyzing their causes (server issues, network problems, or device limitations). Based on this feedback, the device intelligently decides whether to switch bit rates or servers, avoiding unnecessary quality reductions when server switching would be more effective.
Solution Approach 2:
The system dynamically adjusts the playback strategy based on real-time conditions. Instead of a static approach where the device always switches to lower bit rates, the system adapts its behavior by determining the root cause of interruptions and selecting the optimal response (bit rate switching or server switching) accordingly.
2Reliability
If the user device switches to a different server to avoid interruptions, then playback continuity is improved, but start time is increased
Solution Approach 1:
The system performs preliminary analysis of playback interruptions to determine their cause before executing a server switch. By pre-determining that a server issue is the root cause (rather than switching immediately upon any interruption), the system avoids unnecessary server switches that would increase start time without improving playback continuity.
3Reliability
If the user device switches to a different server when no other servers can support the best resolution, then playback continuity is improved, but playback quality is reduced more than necessary
Solution Approach 1:
The system uses feedback from the content delivery network about server capabilities and conditions to make informed decisions. Before switching servers, the device receives information about which servers can support the desired bit rate and resolution, allowing it to avoid switching to servers that cannot maintain quality while still resolving playback interruptions.
Data Source
AI summary
A user device may optimize content delivery by dynamically adjusting encoding strategies based on network conditions. Initially, content is encoded at multiple bit rates defined by a first bit rate ladder having a first ratio between consecutive bit rates. Upon receiving information indicative of network conditions, a second bit rate ladder with a different ratio is generated, and the content is re-encoded at the second set of bit rates. Monitoring of network conditions continues to determine whether changes warrant further adjustments. This dynamic generation and encoding across alternative bit rate ladders enables fine-tuned load reduction in the content delivery network and improved playback quality for user devices.