From fee5da6b0a79bed9dc849f216b6da1e03132b668 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Thu, 7 Mar 2013 19:28:30 +0100 Subject: [PATCH] psymodel: dont apply lowpass filters with a cutoff close to the nyquist The IIR filter numerically diverges in such cases, this could easily be fixed but would make the filter slower on some platforms Fixes Ticket2246 Signed-off-by: Michael Niedermayer --- libavcodec/psymodel.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavcodec/psymodel.c b/libavcodec/psymodel.c index a4a7cbb683..09dd83d315 100644 --- a/libavcodec/psymodel.c +++ b/libavcodec/psymodel.c @@ -106,7 +106,7 @@ av_cold struct FFPsyPreprocessContext* ff_psy_preprocess_init(AVCodecContext *av if (!cutoff_coeff && avctx->codec_id == AV_CODEC_ID_AAC) cutoff_coeff = 2.0 * AAC_CUTOFF(avctx) / avctx->sample_rate; - if (cutoff_coeff) + if (cutoff_coeff && cutoff_coeff < 0.98) ctx->fcoeffs = ff_iir_filter_init_coeffs(avctx, FF_FILTER_TYPE_BUTTERWORTH, FF_FILTER_MODE_LOWPASS, FILT_ORDER, cutoff_coeff, 0.0, 0.0);