From: Steinar H. Gunderson <sgunderson@bigfoot.com>
Date: Thu, 21 May 2020 09:20:14 +0000 (+0200)
Subject: Correct sampling factors for 4:2:2 VA-API encoding.
X-Git-Tag: 2.0.0~26
X-Git-Url: https://git.sesse.net/?p=nageru;a=commitdiff_plain;h=4d97399a1b67631f1844d807d95cb9da48f20477

Correct sampling factors for 4:2:2 VA-API encoding.
---

diff --git a/nageru/mjpeg_encoder.cpp b/nageru/mjpeg_encoder.cpp
index 3308c32..03afac9 100644
--- a/nageru/mjpeg_encoder.cpp
+++ b/nageru/mjpeg_encoder.cpp
@@ -882,9 +882,9 @@ void MJPEGEncoder::encode_jpeg_va(QueuedFrame &&qf)
 
 	int y_h_samp_factor, y_v_samp_factor;
 	if (is_uyvy(qf.frame)) {
-		// 4:2:2 (sample Y' twice as often vertically as Cb or Cr).
-		y_h_samp_factor = 1;
-		y_v_samp_factor = 2;
+		// 4:2:2 (sample Y' twice as often horizontally as Cb or Cr, vertical is left alone).
+		y_h_samp_factor = 2;
+		y_v_samp_factor = 1;
 	} else {
 		// 4:2:0 (sample Y' twice as often as Cb or Cr, in both directions)
 		assert(is_i420(qf.frame));