ffmpeg | branch: master | James Cowgill <[email protected]> | Fri Nov 1
08:51:07 2019 +0000| [bb718d11ed992f4d12ad683e310b53bf1c519322] | committer:
Paul B Mahol
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 <[email protected]>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=bb718d11ed992f4d12ad683e310b53bf1c519322
---
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);
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