av_opt_set_int(resampler, "out_channel_layout", AV_CH_LAYOUT_STEREO, 0);
av_opt_set_int(resampler, "in_sample_rate", av_frame_get_sample_rate(audio_avframe), 0);
av_opt_set_int(resampler, "out_sample_rate", OUTPUT_FREQUENCY, 0);
av_opt_set_int(resampler, "out_channel_layout", AV_CH_LAYOUT_STEREO, 0);
av_opt_set_int(resampler, "in_sample_rate", av_frame_get_sample_rate(audio_avframe), 0);
av_opt_set_int(resampler, "out_sample_rate", OUTPUT_FREQUENCY, 0);