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libsvtav1: Add workaround for gop_size == 1 

In some versions of libsvtav1, setting intra_period_length to 0
does not produce the intended result (i.e.) all frames produced
are not keyframes.

Instead handle the gop_size == 1 as a special case by setting
the pic_type to EB_AV1_KEY_PICTURE when encoding each frame so
that all the output frames are keyframes.

SVT-AV1 Bug: https://gitlab.com/AOMediaCodec/SVT-AV1/-/issues/2076

Example command: ffmpeg -f lavfi -i testsrc=duration=1:size=64x64:rate=30 -c:v libsvtav1 -g 1 -y test.webm

Before: Only first frame is keyframe, rest are intraonly.
After: All frames are keyframes.

Signed-off-by: Vignesh Venkatasubramanian <vigneshv@google.com>
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
This commit is contained in:
Vignesh Venkatasubramanian 2023-06-26 10:47:09 -07:00 committed by Ronald S. Bultje
parent a7b3c0203f
commit 7bcc1b4eb8
1 changed files with 15 additions and 1 deletions
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16
libavcodec/libsvtav1.c
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@ -242,9 +242,20 @@ static int config_enc_params(EbSvtAv1EncConfiguration *param,
if (avctx->level != FF_LEVEL_UNKNOWN)
param->level = avctx->level;
if (avctx->gop_size > 0)
// gop_size == 1 case is handled when encoding each frame by setting
// pic_type to EB_AV1_KEY_PICTURE. For gop_size > 1, set the
// intra_period_length. Even though setting intra_period_length to 0 should
// work in this case, it does not.
// See: https://gitlab.com/AOMediaCodec/SVT-AV1/-/issues/2076
if (avctx->gop_size > 1)
param->intra_period_length = avctx->gop_size - 1;
// 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;
if (avctx->framerate.num > 0 && avctx->framerate.den > 0) {
param->frame_rate_numerator = avctx->framerate.num;
param->frame_rate_denominator = avctx->framerate.den;
@ -462,6 +473,9 @@ static int eb_send_frame(AVCodecContext *avctx, const AVFrame *frame)
break;
}
if (avctx->gop_size == 1)
headerPtr->pic_type = EB_AV1_KEY_PICTURE;
svt_av1_enc_send_picture(svt_enc->svt_handle, headerPtr);
return 0;