[FFmpeg-cvslog] avcodec/svt-av1: Set force_key_frames only when gop_size == 1

[Vignesh Venkatasubramanian via ffmpeg-devel]

ffmpeg | branch: master | Vignesh Venkatasubramanian via ffmpeg-devel <ffmpeg-devel at ffmpeg.org> | Tue Oct  3 15:53:06 2023 -0700| [e8465aa5dda03b4f30d24f192ee165f88a912762] | committer: Ronald S. Bultje

avcodec/svt-av1: Set force_key_frames only when gop_size == 1

SVT-AV1 does not support requesting keyframes at arbitrary points
by setting pic_type to EB_AV1_KEY_PICTURE. So set force_key_frames
to 1 only when gop_size == 1.

Please see the comments in
https://gitlab.com/AOMediaCodec/SVT-AV1/-/issues/2076 for a bit more
details.

Signed-off-by: Vignesh Venkatasubramanian <vigneshv at google.com>
Signed-off-by: Ronald S. Bultje <rsbultje at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e8465aa5dda03b4f30d24f192ee165f88a912762
---

 libavcodec/libsvtav1.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/libavcodec/libsvtav1.c b/libavcodec/libsvtav1.c
index 5015169244..8d2c7f3be4 100644
--- a/libavcodec/libsvtav1.c
+++ b/libavcodec/libsvtav1.c
@@ -253,8 +253,13 @@ static int config_enc_params(EbSvtAv1EncConfiguration *param,
     // In order for SVT-AV1 to force keyframes by setting pic_type to
     // EB_AV1_KEY_PICTURE on any frame, force_key_frames has to be set. Note
     // that this does not force all frames to be keyframes (it only forces a
-    // keyframe with pic_type is set to EB_AV1_KEY_PICTURE).
-    param->force_key_frames = 1;
+    // keyframe with pic_type is set to EB_AV1_KEY_PICTURE). As of now, SVT-AV1
+    // does not support arbitrary keyframe requests by setting pic_type to
+    // EB_AV1_KEY_PICTURE, so it is done only when gop_size == 1.
+    // FIXME: When SVT-AV1 supports arbitrary keyframe requests, this code needs
+    // to be updated to set force_key_frames accordingly.
+    if (avctx->gop_size == 1)
+        param->force_key_frames = 1;
 
     if (avctx->framerate.num > 0 && avctx->framerate.den > 0) {
         param->frame_rate_numerator   = avctx->framerate.num;