allow choice between playbin3 and playbin2 for HLS video

README.html

@@ -13,7 +13,9 @@ Live Streaming) video with the new “-hls” option.</em> Click on the
 airplay icon in the YouTube app to stream video. (You may need to wait
 until advertisements have finished or been skipped before clicking the
 YouTube airplay icon.) <strong>Please report any issues with this new
-feature of UxPlay</strong>.</li>
+feature of UxPlay</strong>. <em>The default video player for HLS is
+GStreamer playbin v3: use “-hls 2” to revert to playbin v2 if some
+videos fail to play</em>.</li>
 </ul>
 <p><strong><em>NEWS</em></strong>: macOS Sequoia 15.2 has an AirPlay
 bug: update to macOS 15.3 for mirroring screen with UxPlay.</p>
@@ -955,10 +957,14 @@ and some iPhones) can send h265 video if a resolution “-s wxh” with h
 &gt; 1080 is requested. The “-h265” option changes the default
 resolution (“-s” option) from 1920x1080 to 3840x2160, and leaves default
 maximum framerate (“-fps” option) at 30fps.</p>
-<p><strong>-hls</strong> Activate HTTP Live Streaming support. With this
-option YouTube videos can be streamed directly from YouTube servers to
-UxPlay (without passing through the client) by clicking on the AirPlay
-icon in the YouTube app.</p>
+<p><strong>-hls [v]</strong> Activate HTTP Live Streaming support. With
+this option YouTube videos can be streamed directly from YouTube servers
+to UxPlay (without passing through the client) by clicking on the
+AirPlay icon in the YouTube app. Optional [v] (allowed values 2 or 3,
+default: 3) allows selection of the version of GStreamer’s "playbin"
+video player to use for playing HLS video. <em>(Playbin v3 is the
+recommended player, but if some videos fail to play, you can try with
+version 2.)</em></p>
 <p><strong>-pin [nnnn]</strong>: (since v1.67) use Apple-style
 (one-time) “pin” authentication when a new client connects for the first
 time: a four-digit pin code is displayed on the terminal, and the client