javacv之於視頻/GIF解幀及重新拼接生成GIF實現
阿新 • • 發佈:2019-05-09
com path puts pom 成熟 erro except ++ str
預備接手表情包處理業務,前期處理並不復雜,流程包括 : GIF動圖與視頻的解幀 , 逐幀處理, 組合各幀得到新的GIF. 經過調研, 整合了ffmpeg的Java CV 可完美處理解幀 , animated-gif-lib 組件包含gif生成的成熟方案 , 進而問題解決.
animated-gif-lib + Java CV
animated-gif-lib.jar是用來拆分和合成GIF的工具包,主要用到其中的GifDecoder/AnimatedGifEncoder.
Java CV 常用於音頻/圖片等處理,其中整合了常用的c++類庫,例如音頻處理的ffmpeg,且可與Open CV配合使用.這裏主要用到FFmpegFrameGrabber來取幀/Java2DFrameConverter來類型轉換.
其實,GifDecoder也可以完成解幀的過程,但實際使用中發現各幀顏色處理上有偏差,解幀問題較大.故而,采用Java CV來解幀,只使用其中合成GIF的操作.
代碼實現
解幀,FFmpegFrameGrabber獲取GIF總幀數時異常,故而采用GifDecoder獲取
String gifPath = "/home/lab/test/11.gif"; String dirPath = "/home/lab/test/gif/"; // 用以解幀 FFmpegFrameGrabber grabberGif = new FFmpegFrameGrabber(gifPath); grabberGif.start(); Frame frame ;// 用以獲取GIF總幀數 GifDecoder decoder = new GifDecoder(); int status = decoder.read(gifPath); if (status != GifDecoder.STATUS_OK) { throw new IOException("read image " + gifPath + " error!"); } // 類型轉換,Frame -> BufferedImage Java2DFrameConverter converter = newJava2DFrameConverter(); int frameCount = decoder.getFrameCount(); for (int i = 0 ; i < frameCount ; i++) { String fileName = dirPath + "img_" + i + ".jpg"; File outPut = new File(fileName); frame = grabberGif.grabImage(); if (frame != null) { ImageIO.write(converter.getBufferedImage(frame),"jpg",outPut); } } grabberGif.stop();
合成GIF
int frameRate = 20;// 新GIF總幀數 String resGif = "/home/lab/test/22.gif"; FileOutputStream targetFile = new FileOutputStream(resGif); // 目標文件流 int margin = 2; // 間隔幀數 AnimatedGifEncoder en = new AnimatedGifEncoder(); en.setFrameRate(frameRate); en.start(targetFile); for (int i = 0; i < frameRate; i++) { en.addFrame(converter.convert(grabberGif.grabImage())); grabberGif.setFrameNumber(grabberGif.getFrameNumber() + margin); } en.finish(); grabberGif.stop(); targetFile.close();
原GIF倒序得到新GIF
String gifPath = "/home/lab/test/11.gif"; // 用以解幀 FFmpegFrameGrabber grabberGif = new FFmpegFrameGrabber(gifPath); grabberGif.start(); // 用以獲取GIF總幀數 GifDecoder decoder = new GifDecoder(); int status = decoder.read(gifPath); if (status != GifDecoder.STATUS_OK) { throw new IOException("read image " + gifPath + " error!"); } // 類型轉換,Frame -> BufferedImage Java2DFrameConverter converter = new Java2DFrameConverter(); int frameCount = decoder.getFrameCount(); String resGif = "/home/lab/test/22.gif"; FileOutputStream targetFile = new FileOutputStream(resGif); // 目標文件流 AnimatedGifEncoder en = new AnimatedGifEncoder(); en.setFrameRate(frameCount); en.start(targetFile); for (int i = frameCount - 1; i >= 0; i--) { grabberGif.setFrameNumber(i); en.addFrame(converter.convert(grabberGif.grabImage())); } en.finish(); grabberGif.stop(); targetFile.close();
pom依賴
因 javacv-platform依賴過重,實際引入的時候推薦指定系統版本的即可.開發機為64位Ubuntu,依賴如下
<dependency> <groupId>org.bytedeco</groupId> <artifactId>javacv</artifactId> <version>1.4.3</version> </dependency> <dependency> <groupId>org.bytedeco.javacpp-presets</groupId> <artifactId>opencv</artifactId> <version>3.4.3-1.4.3</version> <classifier>linux-x86_64</classifier> </dependency> <dependency> <groupId>org.bytedeco.javacpp-presets</groupId> <artifactId>ffmpeg</artifactId> <version>4.0.2-1.4.3</version> <classifier>linux-x86_64</classifier> </dependency> <dependency> <groupId>org.bytedeco</groupId> <artifactId>javacpp</artifactId> <version>1.4.3</version> </dependency> <dependency> <groupId>org.bytedeco.javacpp-presets</groupId> <artifactId>ffmpeg</artifactId> <version>4.0.2-1.4.3</version> <classifier>linux-x86_64</classifier> </dependency> <!-- gif --> <dependency> <groupId>com.madgag</groupId> <artifactId>animated-gif-lib</artifactId> <version>1.4</version> </dependency>
javacv之於視頻/GIF解幀及重新拼接生成GIF實現