refactor: 删除部分多余的代码和注释

src/rtsp/codec.rs

@@ -0,0 +1,9 @@
+use crate::config::RtspCodec;
+use crate::video::encoder::VideoCodecType;
+
+pub(crate) fn rtsp_codec_to_video(codec: RtspCodec) -> VideoCodecType {
+    match codec {
+        RtspCodec::H264 => VideoCodecType::H264,
+        RtspCodec::H265 => VideoCodecType::H265,
+    }
+}