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Topic: ARDFTSRC - Real Discrete Fourier Transform Sample Rate Conversion (Read 16125 times) previous topic - next topic
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Re: ARDFTSRC - Real Discrete Fourier Transform Sample Rate Conversion

Reply #25 –
That is what i mean with poorly presented. The thread is half a year old and still nobody knows what exactly should be so good about it but Discrete Fourier Transforms was some fancy thing for audiophiles.
Is troll-adiposity coming from feederism?
With 24bit music you can listen to silence much louder!
 

Re: ARDFTSRC - Real Discrete Fourier Transform Sample Rate Conversion

Reply #26 –
Here are frequency sweep test files: https://drive.google.com/drive/folders/1LhG6IlcMM4m89xhYGBajVBgpbirXJmw4?usp=drive_link

32000->48000 resampling.

For r8brain-free used float, 48000 Hz destination samplerate and 99% bandwidth
For ardftsrc used: ardftsrc=48000:qualilty=8192:bandwidth=0.98 -c:a pcm_f32le

sweep_orig.wav is PCM float 32bit-le 32000Hz source sample.

Re: ARDFTSRC - Real Discrete Fourier Transform Sample Rate Conversion

Reply #27 –
Here are speed numbers, for one big flac file, from 44100Hz to 48000Hz:

ffmpeg  -i ~/Music/Interstellar.mka -af ardftsrc=48000:thread_type=frame -f null -
elapsed=0:00:01.26 size=N/A time=02:12:00.38 bitrate=N/A speed=6.28e+03x

and now with soxr within aresample filter:

ffmpeg -i ~/Music/Interstellar.mka -af aresample=48000:resampler=soxr -f null -
elapsed=0:00:04.85 size=N/A time=02:12:00.38 bitrate=N/A speed=1.63e+03x

and now just (low quality) swr resampler within aresample filter:

ffmpeg -i ~/Music/Interstellar.mka -af aresample=48000:resampler=swr -f null -
elapsed=0:00:02.58 size=N/A time=02:12:00.38 bitrate=N/A speed=3.07e+03x