[FFmpeg-devel] [PATCH] fftools/ffmpeg_enc: Prevent duplicate A53 Closed Captions at frame rate up-conversion

Artem Smorodin artem.smorodin at telestream.net
Fri Jun 9 16:19:27 EEST 2023

When up-converting frame rate, ffmpeg duplicates frames including side data. This causes duplicated characters in the output. This patch removes A53 side data from duplicated frames.

Signed-off-by: Artem Smorodin <artem.smorodin at telestream.net>
 fftools/ffmpeg_enc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fftools/ffmpeg_enc.c b/fftools/ffmpeg_enc.c
index 2bf4782a9f..93d18034ca 100644
--- a/fftools/ffmpeg_enc.c
+++ b/fftools/ffmpeg_enc.c
@@ -1104,6 +1104,9 @@ static void do_video_out(OutputFile *of, OutputStream *ost, AVFrame *frame)
         else if (ret < 0)
+        //Prevent duplicate Closed Captions at frame rate up-conversion
+        av_frame_remove_side_data(in_picture, AV_FRAME_DATA_A53_CC);


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