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. 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; if (avctx->bit_rate) { enccfg.rc_target_bitrate = av_rescale_rnd(avctx->bit_rate, 1, 1000, -- 2.30.1
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