小编iAv*_*ose的帖子

我成功地将AVFoundation Framework的AVCaptureVideoPreviewLayer捕获的一系列图像编码为使用AVAssetWriter和AVAssetWriterInput的视频.

但是视频的大小太大了,在这种情况下,你们中的任何人都可以向我推荐一个教程或者至少是直接的我,或者给我正确的视频压缩视频输出设置.

我正在使用以下VideoOutputSetting.

videoOutputSettings = @{
                          AVVideoCodecKey: AVVideoCodecH264,
                          AVVideoWidthKey: [NSNumber numberWithInt:width],
                          AVVideoHeightKey: [NSNumber numberWithInt:height],
                          AVVideoCompressionPropertiesKey: @{
                                  AVVideoAverageBitRateKey: [NSNumber numberWithInt:bitrate],
                                  AVVideoMaxKeyFrameIntervalKey: @(150),
                                  AVVideoProfileLevelKey: AVVideoProfileLevelH264BaselineAutoLevel,
                                  AVVideoAllowFrameReorderingKey: @NO,
                                  AVVideoH264EntropyModeKey: AVVideoH264EntropyModeCAVLC,
                                  AVVideoExpectedSourceFrameRateKey: @(30),
                                  AVVideoAverageNonDroppableFrameRateKey: @(30)
                                  }
                          };
    videoWriterInput = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:videoSettings];
    _videoWriterInput.expectsMediaDataInRealTime = YES;

我尝试解密从Web服务收到的加密数据.

加密是使用完成的AES 128.

我使用以下代码来解密数据:

public static String decrypt(String strToDecrypt)
{       
    try
    {
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding"); //AES/CBC/PKCS7Padding
        SecretKeySpec secretKey = new SecretKeySpec(AppConstants.AESEncryptionKey.getBytes("UTF8"), "AES");
        int blockSize = cipher.getBlockSize();
        cipher.init(Cipher.DECRYPT_MODE, secretKey, new IvParameterSpec(new byte[blockSize])); //new IvParameterSpec(new byte[16])
        byte decBytes[] = cipher.doFinal(Base64.decode(strToDecrypt, 0));
        // byte decBytes[] = cipher.doFinal(Base64.decodeBase64(strToDecrypt));
        String decStr = new String(decBytes);
        System.out.println("After decryption :" + decStr);
        return decStr;
    }
    catch (Exception e)
    {
        System.out.println("Exception in decryption : " + e.getMessage());
    }
    return null;
}

在

cipher.doFinal()

我得到以下例外:

javax.crypto.badpaddingexception pad块损坏 …

我在我的项目中集成了Aviary SDK.我正在使用Android Studio.

我还集成了Appcompact V7仍然出现以下错误:

错误:检索项目的父项时出错:找不到与给定名称"@ style/Theme.Base.AppCompat.Dialog.FixedSize"匹配的资源.

请帮助我们提供宝贵的意见.