From 4b85621ecd952b1c0eec49a661e1e0ca69e2b7fe Mon Sep 17 00:00:00 2001
From: "Demi M. Obenour" <demiobenour@gmail.com>
Date: Wed, 2 Jun 2021 22:33:53 -0400
Subject: [PATCH] Return the correct number of bytes

This is needed for Firefox to play more than one frame.  This applies
the fix from
https://github.com/umlaeute/v4l2loopback/issues/190#issuecomment-428313097.
---
 v4l2loopback.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v4l2loopback.c b/v4l2loopback.c
index 2e63751d..efc86b2d 100644
--- a/v4l2loopback.c
+++ b/v4l2loopback.c
@@ -1623,7 +1623,7 @@ static int vidioc_qbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
 			v4l2l_get_timestamp(&b->buffer);
 		else
 			b->buffer.timestamp = buf->timestamp;
-		b->buffer.bytesused = buf->bytesused;
+		b->buffer.bytesused = dev->pix_format.sizeimage;
 		set_done(b);
 		buffer_written(dev, b);