          _input_opts = Effmpeg._common_ffmpeg_args[:]
          _input_path = os.path.join(input_.path, filename)
          _fps_arg = '-r ' + str(fps) + ' '
          _input_opts += _fps_arg + "-f image2 "
          _output_opts = _fps_arg
          if not preview:
              _output_opts = '-y ' + _output_opts + ' -c:v libx264'
          if mux_audio:
              _ref_vid_opts = '-c copy -map 0:0 -map 1:1'
              if preview:
                  raise ValueError("Preview for gen-vid with audio muxing is "
                                   "not supported.")
 
</s> remove             if preview:
                raise ValueError("Preview for gen-vid with audio muxing is "
                                 "not supported.")
 </s> add  </s> remove         if preview:
            raise ValueError("Preview with audio muxing is not supported.")
        # if not preview:
        #    _output_opts = '-y ' + _output_opts
 </s> add  </s> remove         logger.debug("input: %s, output: %s, fps: %s, mux_audio: %s, ref_vid: '%s', preview: %s, "
                     "exe: '%s'", input, output, fps, mux_audio, ref_vid, preview, exe)
 </s> add         logger.debug("input: %s, output: %s, fps: %s, mux_audio: %s, ref_vid: '%s'exe: '%s'",
                     input, output, fps, mux_audio, ref_vid, exe) </s> remove         _output_opts = '-vf '
        if not preview:
            _output_opts = '-y -c:a copy ' + _output_opts
 </s> add         _output_opts = '-y -c:a copy -vf ' </s> remove         if not preview:
            _output_opts = '-y ' + _output_opts + "-vcodec copy -acodec copy"
 </s> add 
        _output_opts = '-y ' + _fps_arg + ' -c:v libx264'
          _input_opts = Effmpeg._common_ffmpeg_args[:]
          _input_path = os.path.join(input_.path, filename)
          _fps_arg = '-r ' + str(fps) + ' '
          _input_opts += _fps_arg + "-f image2 "
        _output_opts = '-y ' + _fps_arg + ' -c:v libx264'
        _output_opts = '-y ' + _fps_arg + ' -c:v libx264'
        _output_opts = '-y ' + _fps_arg + ' -c:v libx264'
          if mux_audio:
              _ref_vid_opts = '-c copy -map 0:0 -map 1:1'
              if preview:
                  raise ValueError("Preview for gen-vid with audio muxing is "
                                   "not supported.")
keep keep keep keep replace replace replace keep keep keep keep keep
 Bugfixes and minor updates:
  - Remove preview option from effmpeg tool
  - Remove json filetypes from GUI for alignments files
  - Capture and raise empty timelapse folder errors
  - Move convert to use centralized ImagesLoader 
tools/effmpeg/effmpeg.py