我正在使用 x264 对从 iphone 相机捕获的原始数据进行编码。但编码速度很慢。谁能帮我加快编码速度。
我使用以下设置来构建 x264 库：
//对于armv6
CC=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc ./configure --host=arm-apple-darwin --sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3 .sdk --prefix='dist' --extra-cflags='-arch armv6' --extra-ldflags=-L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk/usr/lib /system/ --extra-ldflags='-arch armv6' --enable-pic --disable-asm
//对于armv7
CC=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc ./configure --host=arm-apple-darwin --sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3 .sdk --prefix='dist' --extra-cflags='-arch armv7' --extra-ldflags=-L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk/usr/lib /system/ --extra-ldflags='-arch armv7' --enable-pic
我正在使用这样的默认预设：
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 );