recommended tool for high quality sample rate conversion?

[talby]

Are there for high quality sample rate conversion (SRC) in terms of best retained audio quality better tools available than FFmpeg or SoX?
Are these functions in Ocenaudio, Audacity, Ardour, Reaper and Waveform any better or equal or worse?
Which tool would you generally recommend or reject for this task if worried about retained audio quality?
Assuming that FFmpeg and SoX might be the hot candidates, any special option flags which I should use when using these tools?

[d.healey]

SoX is the way to go, it will change the sample rate without reencoding the audio.

There's also Signet which can do sample rate conversions - https://github.com/SamWindell/Signet

[sunrat]

SoX is indeed the way to go. I use a for loop to batch convert a directory full of file to different sample rate or bit depth.

Code: Select all

mkdir 24bit
for i in *.flac; do sox -SG "$i" -b 24 -r 48000 24bit/"$i"; done

"-S" shows progress and info, "-G" guards against clipping. Change "*.flac" to ".wav" for wav files.
Another occasional additional option is to normalize. This one converts to 16 bit, normalizes to -1.0dB, and outputs a flac file from wav input:

Code: Select all

mkdir 16bit
for file in *.wav; do sox -SG "$file" -b 16 16bit/"$file".flac norm -1.0; done