fix(video): adjust duration tolerance and filter warnings in quality validation

Increase the allowed duration mismatch from 0.1 to 0.2 seconds and 2.0 to 5.0 frames per second for MP4 validation. Additionally, filter out warnings related to non-monotonically increasing DTS in the decoding process.

Author: joaner

internal/video/quality.go

@@ -58,7 +58,7 @@ func ValidateMP4(ctx context.Context, locator Locator, path string, expectedFram
 		}
 		if dur, err := strconv.ParseFloat(fields["duration"], 64); err == nil && dur > 0 {
 			want := float64(expectedFrames) / float64(fps)
-			if math.Abs(dur-want) > math.Max(0.1, 2.0/float64(fps)) {
+			if math.Abs(dur-want) > math.Max(0.2, 5.0/float64(fps)) {
 				return fmt.Errorf("video duration mismatch for %s: got=%.3f expected=%.3f", path, dur, want)
 			}
 		}
@@ -76,6 +76,9 @@ func filteredDecodeWarnings(out string) string {
 		if strings.Contains(line, "deprecated pixel format used") {
 			continue
 		}
+		if strings.Contains(line, "Application provided invalid, non monotonically increasing dts to muxer") {
+			continue
+		}
 		kept = append(kept, line)
 	}
 	return strings.Join(kept, "\n")