feat: add optional boolean flag for live video format selection for cases where automatic detection might fail

src/video.rs

@@ -115,10 +115,10 @@ impl Video {
     /// Note that live sourced will report the duration to be zero.
     pub fn new(uri: &url::Url) -> Result<Self, Error> {
         let pipeline = format!("uridecodebin uri=\"{}\" ! videoconvert ! videoscale ! appsink name=iced_video caps=video/x-raw,format=RGBA,pixel-aspect-ratio=1/1", uri.as_str());
-        Self::from_pipeline(pipeline)
+        Self::from_pipeline(pipeline, None)
     }
 
-    pub fn from_pipeline<S: AsRef<str>>(pipeline: S) -> Result<Self, Error> {
+    pub fn from_pipeline<S: AsRef<str>>(pipeline: S, is_live: Option<bool>) -> Result<Self, Error> {
         static NEXT_ID: AtomicU64 = AtomicU64::new(0);
         let id = NEXT_ID.fetch_add(1, Ordering::SeqCst);
 
@@ -127,7 +127,12 @@ impl Video {
         let pipeline = gst::parse::launch(pipeline.as_ref())?
             .downcast::<gst::Pipeline>()
             .map_err(|_| Error::Cast)?;
+
         let mut live = false;
+
+        match is_live {
+            Some(is_live) => live = is_live,
+            None => {
                 pipeline
                     .iterate_sources()
                     .foreach(|elem| {
@@ -138,6 +143,8 @@ impl Video {
                         }
                     })
                     .unwrap();
+            }
+        };
 
         let app_sink_name = "iced_video";
         let app_sink = pipeline