lavfi/aresample: set buffer properties after copy.
The aresample filter changes the format, layout and/or sample rate, it can not copy them blindly from its input. Fix trac ticket 1671 because af_volume uses the properties from the buffer and not from the link.
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@ -176,6 +176,9 @@ static void filter_samples(AVFilterLink *inlink, AVFilterBufferRef *insamplesref
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avfilter_copy_buffer_ref_props(outsamplesref, insamplesref);
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outsamplesref->format = outlink->format;
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outsamplesref->audio->channel_layout = outlink->channel_layout;
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outsamplesref->audio->sample_rate = outlink->sample_rate;
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if(insamplesref->pts != AV_NOPTS_VALUE) {
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int64_t inpts = av_rescale(insamplesref->pts, inlink->time_base.num * (int64_t)outlink->sample_rate * inlink->sample_rate, inlink->time_base.den);
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