From bb718d11ed992f4d12ad683e310b53bf1c519322 Mon Sep 17 00:00:00 2001 From: James Cowgill Date: Fri, 1 Nov 2019 08:51:07 +0000 Subject: [PATCH] avcodec/libtwolame: fix mono default bitrate As of libtwolame 0.4.0, 384 kbps is not accepted as a valid bitrate for encoding mono audio and the maximum bitrate is now halved to 192 kbps to comply with the MP2 standard. Example error: twolame_init_params(): 384kbps is an invalid bitrate for mono encoding. Adjust the default bitrate calculation to take this into account. Signed-off-by: James Cowgill --- libavcodec/libtwolame.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/libavcodec/libtwolame.c b/libavcodec/libtwolame.c index 030f88868f..5ceb3d9f3f 100644 --- a/libavcodec/libtwolame.c +++ b/libavcodec/libtwolame.c @@ -78,8 +78,12 @@ static av_cold int twolame_encode_init(AVCodecContext *avctx) twolame_set_in_samplerate(s->glopts, avctx->sample_rate); twolame_set_out_samplerate(s->glopts, avctx->sample_rate); - if (!avctx->bit_rate) - avctx->bit_rate = avctx->sample_rate < 28000 ? 160000 : 384000; + if (!avctx->bit_rate) { + if ((s->mode == TWOLAME_AUTO_MODE && avctx->channels == 1) || s->mode == TWOLAME_MONO) + avctx->bit_rate = avctx->sample_rate < 28000 ? 80000 : 192000; + else + avctx->bit_rate = avctx->sample_rate < 28000 ? 160000 : 384000; + } if (avctx->flags & AV_CODEC_FLAG_QSCALE || !avctx->bit_rate) { twolame_set_VBR(s->glopts, TRUE);