可可 - 添加视频水印基本信息 [英] Cocoa - Add Video Watermark General Info

问题描述

只是在寻找如何以编程方式添加水印或使用可可某类覆盖的视频。不找一个一步一步（尽管这真棒），但或多或​​少地寻找，我应该开始寻找学习如何。是否有发展的框架，为这项工作。想的东西原产于可可或目标-C或C，因为我想最终给这个在iPhone上一展身手。任何帮助将是巨大的。

Just looking for how to programmatically add a watermark or some sort of overlay to video using cocoa. Not looking for a step by step ( although that would awesome ), but more or less looking for where I should start looking to learn how. Are there frameworks developed to work for this. Would like something native to cocoa or objective-c or c because I would like to eventually give this a go on the iPhone. Any help would be great.

推荐答案

我不知道，如果你的意思只是播放，或者如果你想将视频导出带水印的信息就会显示在其他玩家。

I'm not sure if you mean just for playback, or if you'd like to export a video with a watermark that'll show up on other players.

如果你的意思是只播放，你可能只需要添加在Mac和iPhone播放器查看包含水印的顶视图。

If you mean just for playback, you can probably just add a view on top of the player view on Mac and iPhone that contains the watermark.

如果您想在视频本身的水印，这是很难在Mac上，可能在iPhone上不可能没有本质上的QuickTime重写。

If you'd like a watermark on the video itself, this is hard on the Mac and probably impossible on the iPhone without essentially rewriting QuickTime.

在Mac上，code可能是这样（您需要导入QTKit）：

On the Mac, the code might look like this (you need to import QTKit):

// Make a new movie so we don't destroy the existing one
QTMovie* movie = [[QTMovie alloc] initWithMovie:currentMovie 
                                      timeRange:QTMakeTimeRange(QTMakeTime(0,1000), [currentMovie duration]) 
                                          error:nil];

// Make it editable
[movie setAttribute:[NSNumber numberWithBool:YES] 
             forKey:QTMovieEditableAttribute];

//Get the size
NSValue *value = [movie attributeForKey:QTMovieNaturalSizeAttribute];
NSSize size = [value sizeValue];

// Add a new track to the movie and make it the frontmost layer
QTTrack *track = [movie addVideoTrackWithSize:size];
[track setAttribute:[NSNumber numberWithShort:-1] forKey:QTTrackLayerAttribute];    	

// Create a codec dictionary for the image we're about to add
NSDictionary *imageDict = [NSDictionary dictionaryWithObjectsAndKeys:
        @"tiff", QTAddImageCodecType,
        [NSNumber numberWithLong:codecHighQuality], QTAddImageCodecQuality, nil];


// Get the video length in QT speak

QTTime qttime = [currentMovie duration];
NSTimeInterval reftime;

QTGetTimeInterval(qttime, &reftime);

//Add the image for the entire duration of the video 

[track addImage:image forDuration:qttime withAttributes:imageDict];

// Finally, tell the track that it should use its alpha correctly

MediaHandler media = GetMediaHandler([[track media] quickTimeMedia]);
MediaSetGraphicsMode(media, graphicsModeStraightAlpha, NULL);

...这就是它！你的电影现在有水印，你可以将其导出到文件中。

... And that's it! Your movie now has a watermark, and you can export it to file.

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