Awesome dude, thank you very much. Works like a charm, exactly what I needed.
Von: Libav-user <[email protected]> Im Auftrag von Strahinja Radman Gesendet: 21 February 2019 14:48 An: This list is about using libavcodec, libavformat, libavutil, libavdevice and libavfilter. <[email protected]> Betreff: Re: [Libav-user] Getting resulting width and height from scale filter From: Michael Bachmann<mailto:[email protected]> Sent: 21 February 2019 13:02 To: [email protected]<mailto:[email protected]> Subject: [Libav-user] Getting resulting width and height from scale filter Is there a way to get the resulting width and height from a scale filter, so i can setup the Encoding-AVCodecContext correctly (with width and height)? Here's my init filter method, which gets feeded with the filter description "scale=-1:'min(720,iw)'": int FFMPEGCommands::init_filters(const char *filters_descr, int width, int height, int streamFrameRate) { char args[512]; int ret = 0; const AVFilter *buffersrc = avfilter_get_by_name("buffer"); const AVFilter *buffersink = avfilter_get_by_name("buffersink"); AVFilterInOut *outputs = avfilter_inout_alloc(); AVFilterInOut *inputs = avfilter_inout_alloc(); AVRational time_base = { 1, streamFrameRate }; //AVRational time_base = fmt_ctx->streams[video_stream_index]->time_base; enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE }; filter_graph = avfilter_graph_alloc(); if (!outputs || !inputs || !filter_graph) { ret = AVERROR(ENOMEM); goto end; } /* 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", width, height, STREAM_PIX_FMT, time_base.num, time_base.den, 0, 1); 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"); goto end; } /* buffer video sink: to terminate the filter chain. */ ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out", NULL, NULL, filter_graph); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Cannot create buffer sink\n"); goto end; } ret = av_opt_set_int_list(buffersink_ctx, "pix_fmts", pix_fmts, AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Cannot set output pixel format\n"); goto end; } /* * Set the endpoints for the filter graph. The filter_graph will * be linked to the graph described by filters_descr. */ /* * The buffer source output must be connected to the input pad of * the first filter described by filters_descr; since the first * filter input label is not specified, it is set to "in" by * default. */ outputs->name = av_strdup("in"); outputs->filter_ctx = buffersrc_ctx; outputs->pad_idx = 0; outputs->next = NULL; /* * The buffer sink input must be connected to the output pad of * the last filter described by filters_descr; since the last * filter output label is not specified, it is set to "out" by * default. */ inputs->name = av_strdup("out"); inputs->filter_ctx = buffersink_ctx; inputs->pad_idx = 0; inputs->next = NULL; if ((ret = avfilter_graph_parse_ptr(filter_graph, filters_descr, &inputs, &outputs, NULL)) < 0) goto end; if ((ret = avfilter_graph_config(filter_graph, NULL)) < 0) goto end; end: avfilter_inout_free(&inputs); avfilter_inout_free(&outputs); return ret; } The info you are seeking should be available here filter_ctx.buffersink_ctx->inputs[0]->w for width and filter_ctx.buffersink_ctx->inputs[0]->h for height.
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