Faster Video Trimming Without Re-encoding (#13325)

* input-side seeking and stream copy to avoid video re-encoding on trim

* add changeset

* Format

---------

Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>
Co-authored-by: Freddy Boulton <41651716+freddyaboulton@users.noreply.github.com>

Author: 3 people

.changeset/twelve-sloths-create.md

@@ -0,0 +1,6 @@
+---
+"@gradio/video": patch
+"gradio": patch
+---
+
+fix:Faster Video Trimming Without Re-encoding

js/video/shared/utils.ts

@@ -86,11 +86,12 @@ export async function trimVideo(
 		);
 
 		let command = [
+			"-ss",
+			startTime.toString(),
 			"-i",
 			inputName,
-			...(startTime !== 0 ? ["-ss", startTime.toString()] : []),
-			...(endTime !== 0 ? ["-to", endTime.toString()] : []),
-			"-c:a",
+			...(endTime !== 0 ? ["-to", (endTime - startTime).toString()] : []),
+			"-c",
 			"copy",
 			outputName
 		];