On 3/20/2021 2:51 PM, Carl Eugen Hoyos wrote:
Hi!
Attached patch fixes lossless aom encoding in some cases for me, it is
still possible to force lossy encoding with crf == 0 and qmax > 0.
Please comment, Carl Eugen
From a7b9b60d7091bbf0af84b8eda8bc84ce858d071e Mon Sep 17 00:00:00 2001
From: Carl Eugen Hoyos <ceffm...@gmail.com>
Date: Sat, 20 Mar 2021 18:47:52 +0100
Subject: [PATCH] lavc/aom: Force default qmax to 0 if crf was set to 0.
libaomenc, not just "aom".
Fixes lossless encoding.
---
libavcodec/libaomenc.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/libavcodec/libaomenc.c b/libavcodec/libaomenc.c
index 2c3c3eb185..a8f0420230 100644
--- a/libavcodec/libaomenc.c
+++ b/libavcodec/libaomenc.c
@@ -640,6 +640,8 @@ static av_cold int aom_init(AVCodecContext *avctx,
if (!avctx->bit_rate)
enccfg.rc_end_usage = AOM_Q;
}
+ if (!ctx->crf && avctx->qmax == -1)
+ avctx->qmax = 0;
Don't change avctx, instead set enccfg.rc_max_quantizer directly, but do
it below alongside the existing avctx->qmax check.
if (avctx->bit_rate) {
enccfg.rc_target_bitrate = av_rescale_rnd(avctx->bit_rate, 1, 1000,
--
2.30.1
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