minQuantizerAlpha/maxQuantizerAlpha support in avifEncoder, avifenc, 444alpha support in y4m layer (avifenc, avifdec)
diff --git a/src/write.c b/src/write.c
index 221e5ad..9d45b4a 100644
--- a/src/write.c
+++ b/src/write.c
@@ -34,6 +34,8 @@
     encoder->maxThreads = 1;
     encoder->minQuantizer = AVIF_QUANTIZER_LOSSLESS;
     encoder->maxQuantizer = AVIF_QUANTIZER_LOSSLESS;
+    encoder->minQuantizerAlpha = AVIF_QUANTIZER_LOSSLESS;
+    encoder->maxQuantizerAlpha = AVIF_QUANTIZER_LOSSLESS;
     encoder->tileRowsLog2 = 0;
     encoder->tileColsLog2 = 0;
     encoder->speed = AVIF_SPEED_DEFAULT;