encoder: minor improvements

app/codec/ffmpeg/ffmpegencoder.h

@@ -53,15 +53,6 @@ public:
   }
 
 private:
-  /**
-   * @brief Handle an error
-   *
-   * Immediately closes the Decoder (freeing memory resources) and sends the string provided to the warning stream.
-   * As this function closes the Decoder, no further Decoder functions should be performed after this is called
-   * (unless the Decoder is opened again first).
-   */
-  void Error(const QString& s);
-
   /**
    * @brief Handle an FFmpeg error code
    *
@@ -70,7 +61,7 @@ private:
    *
    * @param error_code
    */
-  void FFmpegError(const char *context, int error_code);
+  void FFmpegError(const QString &context, int error_code);
 
   bool WriteAVFrame(AVFrame* frame, AVCodecContext *codec_ctx, AVStream *stream);