Uns*_*ned 2 flash video frames flash-cs5
我有一个SWF,我想从中提取VideoFrames.当使用7-Zip(VideoFrame)打开SWF时,它们以此名称显示.显然,以这种方式提取它们没有任何结果,因为它们不是任何可识别的图像格式.
我已将SWF加载到Flash Professional CS5中,并且能够在库中查看所有Bitmap对象(在"UI"中组装,在一个角落覆盖视频动画),但我无法在任何地方找到视频帧的枚举,甚至找到显示它们的对象.
我错过了一些非常明显的东西吗？(我对Flash开发有点新,所以很有可能.)
免责声明:这不是为了盈利,也不涉及任何版权侵权.它的个人运动.
编辑:我不想简单地导出SWF的整个帧,因为有几个UI元素覆盖视频.我知道整个视频帧都存在(只是部分掩盖).我想提取嵌入视频的帧,而不是SWF帧.
一种解决方案涉及创建AIR应用程序以对SWF的各个帧进行编码:
一旦所有帧都作为单独的图像输出,就可以使用Flash,FFMPEG或其他视频编辑软件将它们重新组合成视频序列.
下面是将SWF中嵌入的视频的前20帧编码为PNG图像的代码.要使用此功能,请在Flash Pro中创建AIR应用程序,如下所示:
由于这是出于教育目的,它尚未经过优化,因此运行速度非常慢,而且您的计算机可能会无响应,这就是限制为20帧的原因.更好的编码器将异步处理帧以避免CPU过载.
需要AIR的原因是它能够将视频帧直接写入硬盘驱动器.我们无法使用Flash播放器的普通网络版本执行此操作,因为它出于安全原因阻止此类操作(您不希望网站将文件写入您的硬盘驱动器).
操作中最复杂的部分是将图像编码为PNG格式.这是使用Mike Chambers的开源AS3CoreLib中的PNG编码器完成的,因此是版权声明的原因.
更新:更新代码以在SWF内定位视频对象
// location to load the SWF file which you want to capture
var videoFilename:String = "Untitled-1.swf";
// initialise the frame counter
// the frame counter is used to number the individual output images
var frameCount:int = 0;
// create a folder to store the output files
// this creates a folder on the desktop called "video_frames"
var path:File = File.desktopDirectory.resolvePath("video_frames");
path.createDirectory();
var bitmapData:BitmapData;
var bitmap:Bitmap;
// create a loader to load the SWF file
// when the SWF file is loaded we start capturing the frames
var loader:Loader = new Loader();
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, loaderCompleteHandler);
loader.load(new URLRequest(videoFilename));
var video:Video;
// this is called when the SWF is loaded and we can start capturing frames
function loaderCompleteHandler(event:Event):void
{
// find the video in the loaded SWF
findVideo(loader.content);
if (video == null)
throw new Error("cannot find video");
// create a bitmap to capture the frames into
// the bitmap is later encoded into PNG format and written to a file
bitmapData = new BitmapData(video.width, video.height, false, 0xFFFF00FF);
bitmap = new Bitmap(bitmapData, PixelSnapping.ALWAYS, false);
addChild(bitmap);
addEventListener(Event.ENTER_FRAME, frameHandler);
}
function findVideo(input:DisplayObject):void
{
if (!(input is DisplayObjectContainer))
return;
var container:DisplayObjectContainer = input as DisplayObjectContainer;
for (var i:int = 0; i < container.numChildren; i++) {
var child:DisplayObject = container.getChildAt(i);
if (child is Video) {
video = child as Video;
return;
}
else {
findVideo(child);
}
}
}
function frameHandler(event:Event):void {
// count the individual frames and stop capturing after 20 frames
frameCount ++;
if (frameCount > 20) {
removeEventListener(Event.ENTER_FRAME, frameHandler);
return;
}
// capture the current frame of the SWF to the bitmap
// this grabs the pixels into a usable for for encoding
bitmapData.draw(video);
// encode bitmap into PNG format
// you can also easily use JPEG format from AS3CoreLib
var data:ByteArray = encode(bitmapData);
// write the PNG image to a file
// this is the most time-consuming action
var file:File = path.resolvePath("frame" + frameCount + ".png");
var stream:FileStream = new FileStream();
stream.open(file, FileMode.WRITE);
stream.writeBytes(data);
stream.close();
}
/*
Copyright (c) 2008, Adobe Systems Incorporated
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of Adobe Systems Incorporated nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
import flash.geom.*;
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.utils.ByteArray;
/**
* Created a PNG image from the specified BitmapData
*
* @param image The BitmapData that will be converted into the PNG format.
* @return a ByteArray representing the PNG encoded image data.
* @langversion ActionScript 3.0
* @playerversion Flash 9.0
* @tiptext
*/
function encode(img:BitmapData):ByteArray {
// Create output byte array
var png:ByteArray = new ByteArray();
// Write PNG signature
png.writeUnsignedInt(0x89504e47);
png.writeUnsignedInt(0x0D0A1A0A);
// Build IHDR chunk
var IHDR:ByteArray = new ByteArray();
IHDR.writeInt(img.width);
IHDR.writeInt(img.height);
IHDR.writeUnsignedInt(0x08060000); // 32bit RGBA
IHDR.writeByte(0);
writeChunk(png,0x49484452,IHDR);
// Build IDAT chunk
var IDAT:ByteArray= new ByteArray();
for(var i:int=0;i < img.height;i++) {
// no filter
IDAT.writeByte(0);
var p:uint;
var j:int;
if ( !img.transparent ) {
for(j=0;j < img.width;j++) {
p = img.getPixel(j,i);
IDAT.writeUnsignedInt(
uint(((p&0xFFFFFF) << 8)|0xFF));
}
} else {
for(j=0;j < img.width;j++) {
p = img.getPixel32(j,i);
IDAT.writeUnsignedInt(
uint(((p&0xFFFFFF) << 8)|
(p>>>24)));
}
}
}
IDAT.compress();
writeChunk(png,0x49444154,IDAT);
// Build IEND chunk
writeChunk(png,0x49454E44,null);
// return PNG
return png;
}
var crcTable:Array;
var crcTableComputed:Boolean = false;
function writeChunk(png:ByteArray,
type:uint, data:ByteArray):void {
if (!crcTableComputed) {
crcTableComputed = true;
crcTable = [];
var c:uint;
for (var n:uint = 0; n < 256; n++) {
c = n;
for (var k:uint = 0; k < 8; k++) {
if (c & 1) {
c = uint(uint(0xedb88320) ^
uint(c >>> 1));
} else {
c = uint(c >>> 1);
}
}
crcTable[n] = c;
}
}
var len:uint = 0;
if (data != null) {
len = data.length;
}
png.writeUnsignedInt(len);
var p:uint = png.position;
png.writeUnsignedInt(type);
if ( data != null ) {
png.writeBytes(data);
}
var e:uint = png.position;
png.position = p;
c = 0xffffffff;
for (var i:int = 0; i < (e-p); i++) {
c = uint(crcTable[
(c ^ png.readUnsignedByte()) &
uint(0xff)] ^ uint(c >>> 8));
}
c = uint(c^uint(0xffffffff));
png.position = e;
png.writeUnsignedInt(c);
}
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