ffmpeg: ensure a keyframe was not seen before skipping packets

A keyframe could be buffered in the bsf and not be output until more packets
had been fed to it.

Signed-off-by: James Almer <jamrial@gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/fftools/ffmpeg.h b/fftools/ffmpeg.h
index 1b8bbace3f..cc8f767e5d 100644
--- a/fftools/ffmpeg.h
+++ b/fftools/ffmpeg.h
@@ -535,6 +535,7 @@ typedef struct OutputStream {
     int inputs_done;
 
     const char *attachment_filename;
+    int seen_kf;
     int copy_initial_nonkeyframes;
     int copy_prior_start;
     char *disposition;