Fix encoding for codecs with defined fixed frame rates

For such codecs selected time base should match
1 / frame_rate, it was set just frame_rate in the previous impl.
Also, in the patch we set an adjusted frame rate to the codec context.

Pick-to: 6.6 6.5
Change-Id: I33ced3fdd908dbc016b2638387939ad32bd6f030
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Artem Dyomin <artem.dyomin@qt.io>
Reviewed-by: Jøger Hansegård <joger.hansegard@qt.io>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/plugins/multimedia/ffmpeg/qffmpegvideoframeencoder_p.h b/src/plugins/multimedia/ffmpeg/qffmpegvideoframeencoder_p.h
index a977e13cd..d81247088 100644
--- a/src/plugins/multimedia/ffmpeg/qffmpegvideoframeencoder_p.h
+++ b/src/plugins/multimedia/ffmpeg/qffmpegvideoframeencoder_p.h
@@ -73,6 +73,8 @@ private:
     bool m_downloadFromHW = false;
     bool m_uploadToHW = false;
 
+    AVRational m_codecFrameRate = { 0, 1 };
+
     int64_t m_prevPacketDts = AV_NOPTS_VALUE;
     int64_t m_packetDtsOffset = 0;
 };