YouTube: Force html5_exponential_memory_for_sticky

To prevent YouTube to change the video quality automatically during YouTube Live Streaming.

This script is the first script on Greasy Fork to focus on the setting html5_exponential_memory_for_sticky in WEB_PLAYER_CONTEXT_CONFIG_ID_KEVLAR_WATCH.

During YouTube live streaming, the video quality might change as YouTube engine detected your browser might be not that powerful (network slow) to handle the high video quality, but indeed the cause might be due to the overwhelmed chat messages in chat iframe (e.g. Pekora Ch. 兎田ぺこら's popular 生配信).

This script will enable the hidden feature html5_exponential_memory_for_sticky for the player settings such that the video quality will not freely automatically changed.

You can still change the video quality settings using the buttons in the player.

Compatible with YouTube EXPERIMENT_FLAGS Tamer

Notes

Turn ON the following:

html5_exponential_memory_for_sticky becomes true

Turn OFF the following:

html5_perf_cap_override_sticky
html5_ustreamer_cap_override_sticky
html5_always_apply_default_quality_cap
html5_apply_pbr_cap_for_drm
manifestless_post_live_ufph
manifestless_post_live
hls_for_vod
mweb_remove_360p_cap

Testing

((s)=>[...yt.config_.WEB_PLAYER_CONTEXT_CONFIGS.WEB_PLAYER_CONTEXT_CONFIG_ID_KEVLAR_WATCH.serializedExperimentFlags.matchAll(
new RegExp(`\\b(${s})=([^&=]+)\\b`,"g")
)].map(e=>e.slice(1,3))
)(`
html5_exponential_memory_for_sticky|h5_expr_b9Nkc|html5_perf_cap_override_sticky|html5_ustreamer_cap_override_sticky|
html5_always_apply_default_quality_cap|html5_apply_pbr_cap_for_drm|manifestless_post_live_ufph|manifestless_post_live|
hls_for_vod|mweb_remove_360p_cap
`.replace(/\s+/g,'').replace(/\|+/g,'|'));