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vpx: enable parallel decoding

--- a/decoder_vpx.c

+++ b/decoder_vpx.c

@@ -81,11 +81,12 @@

 {

 	Aux *a;

 	vpx_codec_iface_t *iface;

+	vpx_codec_dec_cfg_t cfg = {nproc, 0, 0};

 	a = calloc(1, sizeof(*a));

 	iface = d->s->fmt == FmtVP9 ? vpx_codec_vp9_dx() : vpx_codec_vp8_dx();

-	if(vpx_codec_dec_init(&a->ctx, iface, nil, 0) != 0){

+	if(vpx_codec_dec_init(&a->ctx, iface, &cfg, 0) != 0){

 		werrstr("vpx_codec_dec_init failed");

 		free(a);

 		return -1;