我有一个想要从中提取 VideoFrames 的 SWF。当使用 7-Zip (VideoFrame) 打开 SWF 时，它们会显示在此名称下。显然，以这种方式提取它们没有任何效果，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，并且能够查看库中的所有位图对象（组装在“UI”中，在一个角落覆盖视频动画），但我找不到任何地方的视频帧，甚至可以找到显示它们的对象。
我在这里遗漏了一些非常明显的东西吗？ （我对 Flash 开发有点陌生，所以很有可能。）
免责声明：这不是为了盈利，也不涉及任何侵犯版权的行为。它的个人练习。
编辑：我不想简单地导出 SWF 的整个帧，因为有几个 UI 元素覆盖了视频。我知道整个视频帧都存在（只是部分被掩盖）。我想提取嵌入视频的帧，而不是 SWF 帧。
【问题讨论】：
标签： video flash flash-cs5 frames
一种解决方案是创建一个 AIR 应用程序来对 SWF 的各个帧进行编码：
所有帧都作为单独的图像输出后，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。
以下是将嵌入 SWF 中的视频的前 20 帧编码为 PNG 图像的代码。要使用它，请在 Flash Pro 中创建一个 AIR 应用程序，如下所示：
由于这是出于教育目的，它尚未进行优化，因此运行速度非常慢，您的计算机可能会变得无响应，这就是它限制为 20 帧的原因。更好的编码器会异步处理帧以避免 CPU 过载。
需要 AIR 的原因是它能够将视频帧直接写入您的硬盘。我们无法使用 Flash 播放器的普通网络版本执行此操作，因为出于安全原因它会阻止此类操作（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PNG encoder from the open-source AS3CoreLib by Mike Chambers 完成的，因此是版权声明的原因。
更新：更新代码以定位 SWF 中的视频对象
// 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);
}
【讨论】：
考虑使用 Flash CS5 中的内置导出机制。首先将您的 SWF 作为“已编译的 MovieClip”导入 Flash CS5，然后将其添加到舞台，确保时间轴的长度与 SWF 中的长度匹配。在“文件”>“导出”菜单下，选择“电影”并选择 PNG/JPEG 序列作为文件格式。
取决于您的 SWF 是依赖其动画/行为的代码还是只是一个简单的时间线动画，这可能会或可能不会产生您期望的结果。
编辑：为了摆脱覆盖视频的任何元素，请尝试（再次）将 SWF 导入 Flash CS5，或在运行时将其加载，并通过该 SWF 的显示列表递归。如果您找到该视频，请从其父级中删除所有子级，但视频本身除外。这应该摆脱 UI 元素，并允许您使用上述方法来导出框架。
【讨论】：