Clicking the [Preview / Set Segment] button under the "Source Info." heading will open the "Preview / Set segment" window.
From this window you're able to set up to five (5) specific segments to convert, choose which audio track to use, adjust the volume and synchronization settings of the audio track, and adjust the synchronization of the subtitle track.
1) Setting Segments
The controls at the center of this window are used to set segments. You can segment a video up to 5 times in a single conversion, using the [Start], [End] and input buttons to fine tune each segment.
2) Snapshot / Screencap Button
Next to the [Segment] button you'll notice a button with a camera icon. Click this button will open the "Image Output" window, from which you can export screencaps and create snapshot preview images. For more information about the image output window, please click the link below:
3) Volume Control
The volume button will let you control the volume level of the Preview / Set Segment window. These volume controls only apply to volume output when playing videos in this screen, and will have no effect on your output video.
If you mouse-over the icon, the volume level meter will appear.
Click on this meter to adjust the volume as you see fit.
If you click the volume button itself, you can mute / un-mute the audio.
4) Selecting Audio
If your input file contains several audio tracks (i.e. multiple language tracks and/or tracks with other special settings) you can choose which one to use in the conversion. For more information on selecting audio, please refer to "Selecting audio when converting dual audio video files".
5) Audio Settings
Use the "Sync" inputs to adjust the synchronization between the audio and video tracks by thousandths of a second (0.001s). Clicking the arrow keys will add or subtract 1 millisecond (0.001 second) to the timing. For more precise adjustments, type a value directly into the input box. Use the "Gain" inputs to adjust the volume of the audio track. Setting the gain too high will cause distortion in the audio, so make sure to preview the audio level first before converting.
6) Subtitle Setting
Just like you can adjust the synchronization between the audio and video tracks, you can also fine-tune the synchronization of the subtitle track. Use the "Sync" inputs (under "Subtitle Setting") to shift the position of the subtitle track by thousandths of a second (0.001s). Clicking the arrow keys will add or subtract 1 millisecond (0.001 second) to the timing. For more precise adjustments, type a value directly into the input box.
*Click the [Apply to All Files] button to apply the same segment, audio, and subtitle settings to all the files that are currently on the conversion list.