加速x264编码

Question

我正在使用x264对从iphone摄像头捕获的原始数据进行编码。但是编码非常慢，.Can，有人能帮我加快编码速度吗？

我使用了以下设置来构建x264库：

//用于armv6

/configure --host=arm-apple-darwin --sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk -- CC=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc =‘dist’--sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk=‘-arch armv6’--extra-ldflags=-L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk/usr/lib/system/ --extra-armv6=‘-arch armv6’--enable-pic --disable asm

//用于armv7

/configure --host=arm-apple-darwin --sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk -- CC=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc =‘dist’--sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk=‘-arch armv7’--extra-ldflags=-L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk/usr/lib/system/ --extra-ldflags='-arch armv7‘--enable-armv7

我使用默认预设，如下所示：

x264_param_default_preset(param, "slow", "zerolatency");

并设置几个参数：

param->i_bframe = 0;
param->analyse.i_me_method = X264_ME_HEX;
param->analyse.i_subpel_refine = 2;
param->i_frame_reference = 1;
param->analyse.b_mixed_references = 0;
param->analyse.i_trellis = 0;
param->rc.b_mb_tree = 0;
param->analyse.i_weighted_pred = X264_WEIGHTP_NONE;


param->rc.i_bitrate = 180;
param->rc.i_qp_min = 20; 
param->rc.i_qp_max = 26; 

param->i_keyint_max = 15; 
param->i_keyint_min = 15;


param->i_width = w;
param->i_height = h;

x264_param_apply_profile(param, "baseline");
x264_picture_alloc( &(enc->pic), X264_CSP_I420, param->i_width, param->i_height );

Answer 1

如果将默认预设用作：

x264_param_default_preset(param, "veryfast", "zerolatency");

也许你会在速度上有所提升。然而，我不认为iPhone能够以非常高的速度使用x264对视频进行编码。我从来没有为iPhone开发过任何东西，但通常这些嵌入式系统都有一个硬件编码器，您的应用程序可以使用该编码器。