Align video resolution by 16 for VideoToolbox hardware H.264 encoder

Author: akihikodaki

sdk/objc/native/src/objc_video_track_source.mm

@@ -34,7 +34,7 @@ - (void)capturer:(RTCVideoCapturer *)capturer didCaptureVideoFrame:(RTCVideoFram
 namespace webrtc {
 
 ObjCVideoTrackSource::ObjCVideoTrackSource()
-    : AdaptedVideoTrackSource(/* required resolution alignment */ 2) {}
+    : AdaptedVideoTrackSource(/* required resolution alignment */ 16) {}
 
 ObjCVideoTrackSource::ObjCVideoTrackSource(RTCObjCVideoSourceAdapter *adapter) : adapter_(adapter) {
   adapter_.objCVideoTrackSource = this;