From 9f5d5e27630cb294f0ccad8f5b739b5ae9e09bfb Mon Sep 17 00:00:00 2001
From: tth <sigfood@dinorama.fr>
Date: Tue, 17 Sep 2019 11:43:06 +0200
Subject: [PATCH] bug in upscaling count computation, workaround

---
 v4l2/grabvidseq.c | 6 ++++++
 v4l2/rgb2fimg.c   | 4 +++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/v4l2/grabvidseq.c b/v4l2/grabvidseq.c
index f0dff58..04d20b0 100644
--- a/v4l2/grabvidseq.c
+++ b/v4l2/grabvidseq.c
@@ -305,6 +305,7 @@ t_final = fimg_timer_get(0);
 fprintf(stderr, "pid %d : elapsed %g s -> %.2f fps\n", getpid(),
 			t_final, (double)nbre_capt / t_final);
 
+
 #if SAVE_AS_CUMUL
 if (to_gray) {
 	if (verbosity)	fputs("converting to gray\n", stderr);
@@ -313,6 +314,11 @@ if (to_gray) {
 
 	// save cumul to file
 if (verbosity) fprintf(stderr, "saving to '%s'\n", outfile);
+
+if (upscaling) {		/* nasty workaround */
+	cumul.count /= 4;
+	}
+
 foo = fimg_save_as_pnm(&cumul, outfile, 1);
 
 	// free buffers
diff --git a/v4l2/rgb2fimg.c b/v4l2/rgb2fimg.c
index f39dccb..79bdb7b 100644
--- a/v4l2/rgb2fimg.c
+++ b/v4l2/rgb2fimg.c
@@ -45,7 +45,9 @@ for (y=0; y<h; y++) {
 		}
 	} 
 
-modz++;
+modz++;			/* next displacment index */
+
+d->count++;		/* one more frame in the accumulator */
 
 return -1;
 }