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11.¿ìËÙ²éÕÒij¸öÎļþ
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14.ͳ¼Æµ±Ç°Îļþ¸öÊý
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15.½«±¾µØÎļþ¿½±´µ½·þÎñÆ÷ÉÏ
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./ffmpeg -i out.3gp -ss 00:00:00 -t 00:00:10 -s qcif -acodec copy -vcodec copy -y preview.3gp
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