Articles - > Cutting AVI Files

Title:	Cutting AVI Files
Description:	Find out how to cut an AVI file into several parts
Author/Publisher:	Digital Digest
Ease of use:	Not Rated
Software Used:	VirtualDub
Page Viewed:	278984 times

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gasac: Doesn't seem to work for divx...
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Page 2 of 3: Chinese Version

簡介

假如你懂得使用適合的軟體, 切割 AVI 文檔其實是很簡單的事情. 儘管可以很容易得到一些通用的文檔切割工具, 但它們一般都不懂AVI 文檔的格式, 所以它們切割出來的AVI 文檔都會有各種各樣的問題出現.

如果用一個AVI 編輯軟體來分割AVI 文檔一般都會得到令人滿意的效果. 儘管AVI 的編輯軟體有很多, 但在這一篇指引中我們以 VirtualDub 作例子, 因為它是一個免費的開放原碼軟體, 而且最流行的一個文件

VirtualDub 不是死板地把文檔分割開來, 它是讓你選擇你需要的部分, 然後把它存為一個新的AVI 文檔. (因為不需要重新壓縮, 全過程只需要幾秒鐘)

我們希望你會喜歡這一編指引

所須軟體

在你開始閱讀這篇指引以前你需要下載並安裝下列軟體

VirtualDub - 一個AVI 編輯軟體

具體步驟

運行VirtualDub 並打開你的AVI 文檔 (Ctrl+O) 例如 Movie.avi
在Video 功能表(Alt+V)上選擇直接流式複製 "Direct Stream Copy"
在Audio 功能表(Alt+A)上同樣選擇"Direct Stream Copy".
先熟悉一下VirtualDub 的操作:
1. Slider 滑行條 - 可以用來移動到電影的不同部分
2. Move to last frame 跳到最後一幀- 把滑行條移到電影的最後一個影格
3. Keyframe previous 前一關鍵幀 - 跳到前一個關鍵影格
4. Keyframe next 下一關鍵幀 - 跳到下一個關鍵影格
5. Mark in 開始界限 - 標記修改部分的開端
6. Mark out 結束界限 -標記修改部分的末端
7. Current Slider position 滑行條的位置 - 告訴你滑行條所在的影格
首先跳到最後一幀, 記下滑行條的位置 (這就是總影格數). 例如 2387. 把總影格數除以需要切割的份數就可以得到每份的影格數. 例如2387 分4 份, 那麼每份是 596 個影格.
跳到電影的第一個影格, 按 "Mark in" 設定修改部分的開端.
然後可以用滑行條移動到第596 幀左右, 或者用(Ctrl+G) 選擇Jump to frame number 596. 再用Keyframe previous 或Keyframe next找到上一或者下一個關鍵幀 (從關鍵影格進行分割可以減少出現問題的機會), 記下這個影格號, 因為這也是電影下一部分的開端.

最後就是用 Mark out 來設定修改部分的末端. 注意你選擇了的部分會用藍色在滑動條上表示出來.
在文檔功能表上(Alt+F) 選擇"Save as AVI" 然後把它儲存下來(記住不要覆蓋原來的文檔) 例如 Movie-1.avi
然後重複剛才的步驟, 只是把Mark in 設置到剛才Mark out 的地方, Mark out 就設置到相應的地方. 例如 596 x 2 = 1192, 就把Mark out設在最接近1192的關鍵影格處. 再儲存成一個新的文檔, 例如 Movie-2.avi
當所有需要切割的部分都保存了以後才可以刪除原來的AVI 文檔.

解決音像同步問題

The primary reason for audio synch problems is that audio interleaving option in VirtualDub's "Audio" menu. You should uncheck the "Enable audio/video interleaving" option and make sure the audio track delay setting is at 0. Also, it is wise to cut on keyframes to avoid similar audio problems.

Translated by iCy-fLaME

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User Comments:

Doesn't seem to work for divx files with multiple audio and subtitles.

gasac: This article is dated 2001. You can try a newer version of the article (using VirtualDubMod) here: http://www.digital-digest.com/dvd/articles/article_virtualdubmod_cutavi_page1.html

The editor is easy to use. However, while editting a divx avi file and saving it into a new one, I was surprised that the new file has expanded from 700mb to 75gb. I'm not sure if the application compresses the final output file afterwards. I didn't reach that part since I ran out of disk space. Great editor though. :) Any explanation or tips on how to save my divx avi to approximately the same original size? Thanks.

alqhiqeurass: You've most likely did not select "Direct Stream Copy" from the video menu, and did not set a compressor, so the video was outputted uncompressed (hence the large size). Also, please refer to my earlier comment about using VirtualDubMod