v4l2 set the frame rate through frame intervals,
not set frame rate directly.
the frame rate and frame intervals are reciprocal.
so in libavdevice/v4l2.c we can see the following code:
tpf->numerator = framerate_q.den;
tpf->denominator = framerate_q.num;
Signed-off-by: Ming Qian <[email protected]>
---
libavcodec/v4l2_m2m_enc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/v4l2_m2m_enc.c b/libavcodec/v4l2_m2m_enc.c
index c9f1741bfd..84de63ec9d 100644
--- a/libavcodec/v4l2_m2m_enc.c
+++ b/libavcodec/v4l2_m2m_enc.c
@@ -172,7 +172,7 @@ static int v4l2_prepare_encoder(V4L2m2mContext *s)
* settingss
*/
if (avctx->framerate.num || avctx->framerate.den)
- v4l2_set_timeperframe(s, avctx->framerate.num, avctx->framerate.den);
+ v4l2_set_timeperframe(s, avctx->framerate.den, avctx->framerate.num);
/* set ext ctrls */
v4l2_set_ext_ctrl(s, MPEG_CID(HEADER_MODE),
MPEG_VIDEO(HEADER_MODE_SEPARATE), "header mode");
--
2.17.1
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