opt supported encoding update, consider multi connections (#7978)

Signed-off-by: 21pages <pages21@163.com>

libs/scrap/src/common/record.rs

@@ -2,9 +2,7 @@ use crate::CodecFormat;
 #[cfg(feature = "hwcodec")]
 use hbb_common::anyhow::anyhow;
 use hbb_common::{
-    bail, chrono,
-    config::Config,
-    log,
+    bail, chrono, log,
     message_proto::{message, video_frame, EncodedVideoFrame, Message},
     ResultType,
 };