Revert "revid: removed redundant error logging"

This reverts commit eacbfb9ee3.

revid/revid.go

@@ -48,8 +48,6 @@ import (
 	"bitbucket.org/ausocean/utils/ring"
 )
 
-var ()
-
 // Misc constants
 const (
 	clipDuration            = 1 * time.Second
@@ -142,7 +140,8 @@ func (p *packer) Write(frame []byte) (int, error) {
 			p.owner.config.Logger.Log(logger.Warning, pkg+"dropped frame", "frame size", len(frame))
 			return len(frame), nil
 		}
-		return n, errors.New(pkg + "unexpected ring buffer write error: " + err.Error())
+		p.owner.config.Logger.Log(logger.Error, pkg+"unexpected ring buffer write error", "error", err.Error())
+		return n, err
 	}
 	p.packetCount++
 	now := time.Now()
@@ -471,6 +470,7 @@ func (r *Revid) setupInputForFile() error {
 	delay := time.Second / time.Duration(r.config.FrameRate)
 	f, err := os.Open(r.config.InputFileName)
 	if err != nil {
+		r.config.Logger.Log(logger.Error, err.Error())
 		r.Stop()
 		return err
 	}