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FFmpeg: Audio resampling

https://ffmpeg.org/doxygen/0.11/group__lavc__resample.html

Initialize an audio resampler. int : av_resample (struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx) Resample an array of samples using a previously configured context. void : av_resample_compensate (struct AVResampleContext *c, int sample_delta, int compensation_distance) Compensate samplerate/timestamp drift. void

c++ - Resampling audio using FFmpeg API - Stack Overflow

https://stackoverflow.com/questions/64326526/resampling-audio-using-ffmpeg-api

I need to create a "resampling" between points 3 and 4. Before sending data to the encoder, it must pass resampling if required. For example, I get audio data in PCM_ALAW format, with 1 audio channel, and 8000 sample rate. When exiting, I want to get PCM_S32LE, with 2 channels and a sampling rate of 44100. Converting audio format PCM_ALAW to ...

Careful with audio resampling using FFmpeg | Transcoding ...

https://transcoding.wordpress.com/2011/11/16/careful-with-audio-resampling-using-ffmpeg/

Update II – FFmpeg now includes the SoX resampler – but only utilizes it if you tells it to – the default resampler is still the simple one with its limitations. To use the better resampler from SoX, eg resampling to 44.1 kHz, add the following to your command line:-af aresample=resampler=soxr -ar 44100

FFmpeg/resampling_audio.c at master · FFmpeg/FFmpeg

https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/resampling_audio.c

IN NO EVENT SHALL. * THE SOFTWARE. * libswresample API use example. * Fill dst buffer with nb_samples, generated starting from t. fprintf (stderr, "Resampling succeeded. Play the output file with the command:\n".

FFmpeg Resampler Documentation

https://ffmpeg.org/ffmpeg-resampler.html

The audio resampler supports the following named options. Options may be set by specifying -option value in the FFmpeg tools, option=value for the aresample filter, by setting the value explicitly in the SwrContext options or using the libavutil/opt.h API for programmatic use. ich, in_channel_count. Set the number of input channels. Default value is 0.

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