流程描述:我把每一帧原始YUV图像数据,构造成Y4M(YUV4MPEG2)格式的流,然后使用ffmpeg编码成h264格式进行RTMP推流。 ffmpeg执行avformat_open_input打开文件和执行avformat_find_stream_info探测流都正常,但在执行avformat_write_header报错:Invalid data found when processing input。
二、原因
编码器参数设置错误
// enc_ctx编码器上下文,dec_ctx解码器上下文 AVCodecContext *dec_ctx,*enc_ctx; ... dec_ctx = pFormatCtx->streams[i]->codec; ... if(dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO){LOGD_DEBUG("height = %d, width = %d, sample_aspect_ratio = %d/%d, pix_fmt = %d, framerate = %d/%d, time_base = %d/%d",dec_ctx->height, dec_ctx->width,dec_ctx->sample_aspect_ratio.num,dec_ctx->sample_aspect_ratio.den,dec_ctx->pix_fmt,dec_ctx->framerate.num, dec_ctx->framerate.den,dec_ctx->time_base.num, dec_ctx->time_base.den);enc_ctx->height = dec_ctx->height;enc_ctx->width = dec_ctx->width;enc_ctx->sample_aspect_ratio = dec_ctx->sample_aspect_ratio;/* take first format from list of supported formats */if(encoder->pix_fmts)enc_ctx->pix_fmt = encoder->pix_fmts[0];elseenc_ctx->pix_fmt = dec_ctx->pix_fmt;/* video time_base can be set to whatever is handy and supported by encoder */enc_ctx->time_base = dec_ctx->framerate;enc_ctx->codec_type = AVMEDIA_TYPE_VIDEO; }
// enc_ctx编码器上下文,dec_ctx解码器上下文 AVCodecContext *dec_ctx,*enc_ctx; ... dec_ctx = pFormatCtx->streams[i]->codec; ... if(dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO){LOGD_DEBUG("height = %d, width = %d, sample_aspect_ratio = %d/%d, pix_fmt = %d, framerate = %d/%d, time_base = %d/%d",dec_ctx->height, dec_ctx->width,dec_ctx->sample_aspect_ratio.num,dec_ctx->sample_aspect_ratio.den,dec_ctx->pix_fmt,dec_ctx->framerate.num, dec_ctx->framerate.den,dec_ctx->time_base.num, dec_ctx->time_base.den);enc_ctx->height = dec_ctx->height;enc_ctx->width = dec_ctx->width;enc_ctx->sample_aspect_ratio ={476,477};//dec_ctx->sample_aspect_ratio;/* take first format from list of supported formats */if(encoder->pix_fmts)enc_ctx->pix_fmt = encoder->pix_fmts[0];elseenc_ctx->pix_fmt = dec_ctx->pix_fmt;/* video time_base can be set to whatever is handy and supported by encoder */enc_ctx->time_base =av_inv_q({25,1});//dec_ctx->framerate);enc_ctx->codec_type = AVMEDIA_TYPE_VIDEO; }