From: JonHGee <jonhgee@gmail.com>
To: ffmpeg-devel@ffmpeg.org
Cc: JonHGee <JonHGee@gmail.com>
Subject: [FFmpeg-devel] [PATCH] Scale libFDK encoder VBR mode with FF_QP2LAMBDA
Date: Wed, 22 Feb 2023 01:21:52 +0000
Message-ID: <20230222012152.2360157-1-JonHGee@gmail.com> (raw)
VBR mode currently does not account for scaling when using -aq options with libfdk, resulting in clamping to vbr mode 5 whenever a value >0 is provided. Adjusting for the scaling factor for proper VBR support.
---
libavcodec/libfdk-aacenc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/libfdk-aacenc.c b/libavcodec/libfdk-aacenc.c
index 54549de473..da211baf51 100644
--- a/libavcodec/libfdk-aacenc.c
+++ b/libavcodec/libfdk-aacenc.c
@@ -230,7 +230,7 @@ static av_cold int aac_encode_init(AVCodecContext *avctx)
}
if (avctx->flags & AV_CODEC_FLAG_QSCALE || s->vbr) {
- int mode = s->vbr ? s->vbr : avctx->global_quality;
+ int mode = s->vbr ? s->vbr : avctx->global_quality / FF_QP2LAMBDA;
if (mode < 1 || mode > 5) {
av_log(avctx, AV_LOG_WARNING,
"VBR quality %d out of range, should be 1-5\n", mode);
--
2.39.2.637.g21b0678d19-goog
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