如何连接code H.264与libav codeC / X264? [英] How to encode h.264 with libavcodec/x264?
问题描述
我使用libav codeC / libavformat依次尝试连接code视频。音频的伟大工程,但是当我尝试连接code视频我收到以下错误:
I am attempting to encode video using libavcodec/libavformat. Audio works great, but when I try to encode video I get the following errors:
[libx264 @ 0x10182a000]broken ffmpeg default settings detected
[libx264 @ 0x10182a000]use an encoding preset (vpre)
容易解决使用命令行的ffmpeg,但我想这样做是C.
我的选择是
easy to fix using the command line ffmpeg, but I am trying to do this in C. my options are
AVStream *pVideoOutStream = av_new_stream(pOutFormatCtx, 0);
AVCodecContext *pVideoOutCodecCtx = pVideoOutStream->codec;
pVideoOutCodecCtx->codec_id = CODEC_ID_H264;
pVideoOutCodecCtx->codec_type = CODEC_TYPE_VIDEO;
pVideoOutCodecCtx->bit_rate = pVideoInCodecCtx->bit_rate;
pVideoOutCodecCtx->width = pVideoInCodecCtx->width;
pVideoOutCodecCtx->height = pVideoInCodecCtx->height;
pVideoOutCodecCtx->pix_fmt = pVideoInCodecCtx->pix_fmt;
pVideoOutCodecCtx->sample_rate = pVideoInCodecCtx->sample_rate;
pVideoOutCodecCtx->gop_size = 30;
但AV codec_open()失败。
but avcodec_open() fails.
还有什么其他价值,我需要设置为使X264的幸福吗?
What other values do I need to set to make x264 happy?
推荐答案
不知道你是否懂了工作,但下面的参数为我工作。
Not sure whether you got it working, but the following parameters work for me.
ctx->bit_rate = 500*1000;
ctx->bit_rate_tolerance = 0;
ctx->rc_max_rate = 0;
ctx->rc_buffer_size = 0;
ctx->gop_size = 40;
ctx->max_b_frames = 3;
ctx->b_frame_strategy = 1;
ctx->coder_type = 1;
ctx->me_cmp = 1;
ctx->me_range = 16;
ctx->qmin = 10;
ctx->qmax = 51;
ctx->scenechange_threshold = 40;
ctx->flags |= CODEC_FLAG_LOOP_FILTER;
ctx->me_method = ME_HEX;
ctx->me_subpel_quality = 5;
ctx->i_quant_factor = 0.71;
ctx->qcompress = 0.6;
ctx->max_qdiff = 4;
ctx->directpred = 1;
ctx->flags2 |= CODEC_FLAG2_FASTPSKIP;
有可能通过FFmpeg的源$ C $ C寻找并确定preSET文件是如何映射到AV codecContext参数,但我忘了究竟在何处的奇迹发生。
It is possible to look through the FFmpeg source code and determine how the preset files map to AVCodecContext parameters, but I forget exactly where the magic happens.
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