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obs-ffmpeg: If ffaac is used, change cutoff freq

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If FFmpeg's experimental aac encoder is used, this changes the cutoff
frequency to better values in order to try to help make up for the
inherent lack of encoder quality a bit.  If FFmpeg is compiled to use
another encoder by default, these settings will not be applied.
This commit is contained in:
jp9000
2014-11-10 01:10:19 -08:00
parent 5888085a8e
commit ae862c16a6
1 changed files with 17 additions and 0 deletions
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17
plugins/obs-ffmpeg/obs-ffmpeg-aac.c
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@@ -121,6 +121,10 @@ static void init_sizes(struct aac_encoder *enc, audio_t *audio)
enc->audio_size = get_audio_size(format, aoi->speakers, 1);
}
#ifndef MIN
#define MIN(x, y) ((x) < (y) ? (x) : (y))
#endif
static void *aac_create(obs_data_t *settings, obs_encoder_t *encoder)
{
struct aac_encoder *enc;
@@ -156,6 +160,19 @@ static void *aac_create(obs_data_t *settings, obs_encoder_t *encoder)
enc->context->sample_fmt = enc->aac->sample_fmts ?
enc->aac->sample_fmts[0] : AV_SAMPLE_FMT_FLTP;
/* if using FFmpeg's AAC encoder, at least set a cutoff value
* (recommended by konverter) */
if (strcmp(enc->aac->name, "aac") == 0) {
int cutoff1 = 4000 + enc->context->bit_rate / 8;
int cutoff2 = 12000 + enc->context->bit_rate / 8;
int cutoff3 = enc->context->sample_rate / 2;
int cutoff;
cutoff = MIN(cutoff1, cutoff2);
cutoff = MIN(cutoff, cutoff3);
enc->context->cutoff = cutoff;
}
blog(LOG_INFO, "FFmpeg AAC: bitrate: %d, channels: %d",
enc->context->bit_rate / 1000, enc->context->channels);