avcodec/frame_thread_encoder: Avoid creating reference to frame

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/libavcodec/encode.c b/libavcodec/encode.c
index 29f41c3f92..282337e453 100644
--- a/libavcodec/encode.c
+++ b/libavcodec/encode.c
@@ -152,6 +152,10 @@ static int encode_simple_internal(AVCodecContext *avctx, AVPacket *avpkt)
 
     if (CONFIG_FRAME_THREAD_ENCODER &&
         avci->frame_thread_encoder && (avctx->active_thread_type & FF_THREAD_FRAME))
+        /* This might modify frame, but it doesn't matter, because
+         * the frame properties used below are not used for video
+         * (due to the delay inherent in frame threaded encoding, it makes
+         *  no sense to use the properties of the current frame anyway). */
         ret = ff_thread_video_encode_frame(avctx, avpkt, frame, &got_packet);
     else {
         ret = avctx->codec->encode2(avctx, avpkt, frame, &got_packet);