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Make avfilter_config_links() propagate audio information of the source link if it is not explicitely set by the filter.
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@ -198,6 +198,12 @@ int avfilter_config_links(AVFilterContext *filter)
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link->sample_aspect_ratio = link->src->input_count ?
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link->src->inputs[0]->sample_aspect_ratio : (AVRational){1,1};
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if (link->sample_rate == 0 && link->src && link->src->input_count)
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link->sample_rate = link->src->inputs[0]->sample_rate;
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if (link->channel_layout == 0 && link->src && link->src->input_count)
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link->channel_layout = link->src->inputs[0]->channel_layout;
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if ((config_link = link->dstpad->config_props))
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if ((ret = config_link(link)) < 0)
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return ret;
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