1. Preview video while converting. Ԥ����Ƶ����ת����
2. Default height for video preview. Ԥ����Ƶ��Ĭ�ϸ߶ȡ�
3. It supports preview and it can convert any clip or segment. ��֧��Ԥ����������ת�����κμ������߶Ρ�
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n.
1. an advertisement consisting of short scenes from a motion picture that will appear in the near futur
2. a screening for a select audience in advance of release for the general public v.
1. watch (a movie or play) before it is released to the general public