Fix the behavior of HDR remuxing in HLS.js 1.5+

Without this change, HLS.js 1.5+ only allows HDR playback on
displays/systems with HDR enabled. When the server provides
two streams one HDR and one SDR for fallback, HLS.js will
ignore the HDR stream, even if the browser supports
client-side tone-mapping. This triggers unnecessary transcoding.

Signed-off-by: nyanmisaka <nst799610810@gmail.com>

src/plugins/htmlVideoPlayer/plugin.js

@@ -443,6 +443,7 @@ export class HtmlVideoPlayer {
                     startPosition: options.playerStartPositionTicks / 10000000,
                     manifestLoadingTimeOut: 20000,
                     maxBufferLength: maxBufferLength,
+                    videoPreference: { preferHDR: true },
                     xhrSetup(xhr) {
                         xhr.withCredentials = includeCorsCredentials;
                     }