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2011年7月13日 星期三

用vlc看上下顛倒的影片

071411取自 http://www.online-tech-tips.com/computer-tips/fix-upside-down-videos-in-vlc/

Last week, we talked about how Windows Movie Maker can fix upside down videos. This time, we will try it with VLC, an open-source and free media player.

The difference between the two platforms is that with the former, you have an option to create or publish the movie. The result or effect will be permanent. Once you play the file, it will have the rotated video.

The latter, on the other hand, will fix the upside down video and play it immediately in the media player. Moreover, with VLC, you can use two methods for resolving this glitch. The first one is through the Transform feature and the other one is through Geometry-Rotate.

If you plan to share the movie, edit its contents, upload it to YouTube or Facebook, or burn it to CD/ DVD, Windows Movie Maker is the better choice. However, if you’re in a hurry and want to watch the video right away, it is recommended you fix the problem using VLC.

To start, open the VLC program and click the Tools menu.

tools menu

Next, press Effects and Filters.

effects & filters

The default display is Audio Effects. Hit the Video Effects tab to proceed to the next step.

video effects

Under Video Effects, check the Transform checkbox.

rotate 180

For this illustration, because we want to resolve the upside down video, we will select Rotate by 180 degrees.

You also have an option to rotate the file by 90 or 270 degrees, or flip it horizontally or vertically.

rotate modes

You will see the result immediately. This is the original video.

original video

This is the resolved movie. After the fix, you can continue playing and watching the video.

rotated video

The other way of patching up upside down video using VLC is through the Geometry-Rotate feature.

To access this tool, you still have to click the same commands used in the first method. Go to Tools > Effects and Filters > Video Effects. Instead of going to Basic, browse to the Geometry tab.

Next, check the Rotate checkbox. In here, you can see the Angle needle. This needle will be used to rotate the video according to your preferred angle.

rotate angle

This is the default angle of the video when you enable Geometry’s Rotate feature.

rotate video angle

Move the needle downwards to rotate the upside down movie by 180 degrees.

correct angle

You can see the effect in real-time. This is the result file rotated by the Angle’s needle.

angle rotated

Remember though that VLC’s fix is not permanent. Once you close the file and play it again, you will still see the upside down video.

因行車記錄器位置的關係,影像上下顛倒,在win可用kmplayer,我在ubuntu下用vlc,原選工具Preference下的視訊 濾波器 的旋轉及轉換皆無效,看了上述才知應在工具Effects and Filter下選第2項(選單仍譯成 音訊效果),之後win也改回vlc。