AVFILTER_DEFINE_CLASS(volume);
-static av_cold int init(AVFilterContext *ctx, const char *args)
+static av_cold int init(AVFilterContext *ctx)
{
VolumeContext *vol = ctx->priv;
.init = init,
.inputs = avfilter_af_volume_inputs,
.outputs = avfilter_af_volume_outputs,
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE,
};