refactor: move PlayFlags defaults into Playbin3 and clean up unused prelude imports

crates/iced-video/src/source.rs

@@ -5,7 +5,7 @@ use gst::{
     caps::{Caps, CapsType},
     element::ElementExt,
     pipeline::PipelineExt,
-    playback::{PlayFlags, Playbin, Playbin3},
+    playback::{PlayFlags, Playbin3},
     videoconvertscale::VideoConvert,
 };
 use std::sync::{Arc, Mutex, atomic::AtomicBool};
@@ -48,7 +48,7 @@ impl VideoSource {
             .with_buffer_duration(core::time::Duration::from_secs(2))
             .with_buffer_size(4096 * 4096 * 4 * 3)
             .with_ring_buffer_max_size(4096 * 4096 * 4 * 3)
-            .with_flags(PlayFlags::default() | PlayFlags::DOWNLOAD)
+            .with_flags(Playbin3::default_flags() | PlayFlags::DOWNLOAD)
             .with_video_sink(&video_sink);
         let bus = playbin.bus().change_context(Error)?;
         playbin.pause().change_context(Error)?;