YUV420数据和字符信息如何利用滤镜方法进行编码？

[柳长街]

YUV420数据和字符信息如何利用滤镜方法进行编码？
我希望用ffmpeg中的filter方法，把YUV420数据和字符信息一起编码，该怎么办呢？
本人的qq:94643913,望有做过的朋友联系本人！

本人目前只实现了把yuv420的数据进行h.264的编码了。

[神勇小胖子]

楼主你好，能帮你实现yuv420的数据进行264编码的例子发给我参考下么，目前刚好在学习这个

[柳长街]

本人成功实现利用ffmpeg中的滤镜 filter功能,在码流中进行字符叠加，太不容易了！ 本人使用的是ffmpeg 1.0.7的代码 部分代码如下： //设定输出格式列表，支持PIX_FMT_YUV420P,PIX_FMT_GRAY8,PIX_FMT_RGB24 //enum FFmpegPixFmt::PixelFormat pix_fmts[] = {PIX_FMT_GRAY8, PIX_FMT_NONE }; //初始化滤镜所用的变量 static int init_filters(const char *filters_descr) { char args[512]; int ret; AVFilter *buffersrc = avfilter_get_by_name("buffer"); AVFilter *buffersink = avfilter_get_by_name("ffbuffersink"); AVFilterInOut *outputs = avfilter_inout_alloc(); AVFilterInOut *inputs = avfilter_inout_alloc(); enum PixelFormat pix_fmts[] = {PIX_FMT_YUV420P, PIX_FMT_NONE }; AVBufferSinkParams *buffersink_params; filter_graph = avfilter_graph_alloc(); /* buffer video source: the decoded frames from the decoder will be inserted here. */ _snprintf(args, sizeof(args), "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d", dec_ctx->width, dec_ctx->height, dec_ctx->pix_fmt, dec_ctx->time_base.num, dec_ctx->time_base.den, dec_ctx->sample_aspect_ratio.num, dec_ctx->sample_aspect_ratio.den); ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in",args, NULL, filter_graph); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Cannot create buffer source\n"); return ret; } /* buffer video sink: to terminate the filter chain. */ buffersink_params = av_buffersink_params_alloc(); buffersink_params->pixel_fmts = pix_fmts; ret = avfilter_graph_create_filter(&buffersink_ctx,buffersink,"out",NULL,buffersink_params, filter_graph); av_free(buffersink_params); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Cannot create buffer sink\n"); return ret; } /* Endpoints for the filter graph. */ outputs->name = av_strdup("in"); outputs->filter_ctx = buffersrc_ctx; outputs->pad_idx = 0; outputs->next = NULL; inputs->name = av_strdup("out"); inputs->filter_ctx = buffersink_ctx; inputs->pad_idx = 0; inputs->next = NULL; if ((ret = avfilter_graph_parse(filter_graph, filters_descr,&inputs, &outputs, NULL)) < 0) return ret; if ((ret = avfilter_graph_config(filter_graph, NULL)) < 0) return ret; return 0; } char *outfilename = "D:\\out.yuv"; FILE *fp = fopen(outfilename, "a+b"); //所有视频帧都存在同一个文件 //fp = fopen(outfilename, "wb");//每次存一个文件 //滤镜描述字符串 const CHAR *filter_descr="drawtext=fontfile=simfont.ttf:fontcolor=white:shadowcolor=black:text='测试视频':x=10:y=10"; int ret=0; AVPacket packet; AVFrame m_frame; int got_frame; avcodec_register_all(); av_register_all(); avfilter_register_all(); if ((ret = open_input_file("input.h264")) < 0) goto end; if ((ret = init_filters(filter_descr)) < 0) goto end; /* read all packets */ while (1) { AVFilterBufferRef *picref; if ((ret = av_read_frame(fmt_ctx, &packet)) < 0) break; if (packet.stream_index != video_stream_index) continue; avcodec_get_frame_defaults(&m_frame); got_frame = 0; ret = avcodec_decode_video2(dec_ctx, &m_frame, &got_frame, &packet); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Error decoding video\n"); break; } if (got_frame) { m_frame.pts = av_frame_get_best_effort_timestamp(&m_frame); if (av_buffersrc_add_frame(buffersrc_ctx, &m_frame, 0) < 0) { av_log(NULL, AV_LOG_ERROR, "Error while feeding the filtergraph\n"); break; } while (1) { ret = av_buffersink_get_buffer_ref(buffersink_ctx, &picref, 0); if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) break; if (ret < 0) goto end; if (picref) { fwrite(picref->data[0], 1, picref->buf->w * picref->buf->h * 3 / 2, fp); fflush(fp);// fclose(fp); //display_picref(picref, buffersink_ctx->inputs[0]->time_base); avfilter_unref_bufferp(&picref); } } } av_free_packet(&packet); } end: avfilter_graph_free(&filter_graph); if (dec_ctx) avcodec_close(dec_ctx); avformat_close_input(&fmt_ctx); if (ret < 0 && ret != AVERROR_EOF) { char buf[1024]; av_strerror(ret, buf, sizeof(buf)); fprintf(stderr, "Error occurred: %s\n", buf); exit(1); } MessageBox("解码完成！");

[smilestone322]

不错，支持下

[wutianke]

将YUV420数据编码成H264数据，例程可以给我发一下吗，谢谢 是利用的ffmpeg吧?初学中

[黑泡泡选手]

给个效果图看看哪~

[youngalmond11]

楼主做出来分享很高尚，赞一个!

[Henry0214]

好人必须赞一个，国内发帖比较少见到有人自己解决问题了发出来分享的。希望大家都能发扬这样的精神