Speed comparison. The source file is a CD image, stereo, 16 bps, 44100 Hz. Duration reported by foobar2000: 55:41.150 (147 344 700 samples).
Conversion run untimed first so the source file gets cached in memory. C: is a fast NVMe SSD too, so not a bottleneck.
$ del C:\temp\out.wav & timer64 ffmpeg -i c:\temp\image.wav -af "ardftsrc=48000,atrim=start=0" -acodec pcm_f32le c:\temp\out.wav
- timed conversion ran three times, fastest run took 2.027 seconds. Average 2.065 s
- the conversion speed for the fastest run is 1648x realtime
$ del C:\temp\out.wav & timer64 ffmpeg7 -i c:\temp\image.wav -af "aresample=48000:resampler=soxr" -acodec pcm_f32le c:\temp\out.wav
- timed conversion ran three times, fastest run took 1.711 seconds. Average 1.711 s
- the conversion speed for the fastest run is 1953x realtime
The ardftsrc produced output length is still incorrect: 55:41.153 (160 375 360 samples)
Sox length is correct: 55:41.150 (160 375 184 samples)
147 344 700 / 44100 * 48000 = 160 375 183,67..., which rounds up to 160 375 184
Quality comparison:
$ ffmpeg -i swept_float.wv -af "ardftsrc=48000,atrim=start=0" -acodec pcm_f32le ardftsrc.wav
$ ffmpeg7 -i swept_float.wv -af "aresample=48000:resampler=soxr" -acodec pcm_f32le soxr.wav
$ ffmpeg7 -i ardftsrc.wav -lavfi showspectrumpic=s=1280x800 ardftsrc.png
$ ffmpeg7 -i soxr.wav -lavfi showspectrumpic=s=1280x800 soxr.png
$ ffmpeg7 -i swept_float.wv -lavfi showspectrumpic=s=1280x800 swept_float.png
ardftsrc.png:
soxr.png:
swept_float.png:
Edit: Added labels for images.
Topic: Resampler plugin (Read 496071 times)
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