可可 - 添加视频水印一般信息 [英] Cocoa - Add Video Watermark General Info

问题描述

只是寻找如何以编程方式使用可可添加水印或某种覆盖到视频。不是一步一步寻找（虽然这将真棒），但或多或​​少寻找在哪里我应该开始寻找学习如何。是否有框架为此工作。想要一些本地的可可或目标c或c，因为我想最终把这一点在iPhone上。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

我不知道你是否意味着只是为了播放，导出带有将显示在其他播放器上的水印的视频。

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.

如果您只是想播放，您可以在Mac和iPhone上的播放器视图顶部添加一个视图，其中包含水印。

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.

如果你想在视频上添加一个水印，这在Mac上是很难的，在iPhone上可能是不可能的，基本上没有重写QuickTime。

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，代码可能如下所示（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);

...就是这样！您的电影现在有一个水印，您可以将其导出到文件。

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

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