Sox batch conversion

Question

I'm trying to convert 728 .raw files to 16khz .wav files by using the script given in the link here but I'm receiving an error

sox FAIL formats: can't open input file `./*.wav': No such file or directory

script I'm using is

for i in ./*.raw; do sox "$i" -r 16000 "${i%%.wav}r.wav"; done

the script is in convert.sh and the raw files are in rawfiles folder. The file structure is like

/Orginal/rawfiles/.rawfiles and /Orginal/convert.sh

I have 728 files to convert .raw files to 16 bit 16khz mono wav files. What modifications do I have to do in order to remove the error and convert the files?

Which folder are you running this script from? `*.wav` will look for files with `wav` extension and not `.raw` files — Inian, Feb 20 '18 at 11:54
@Inian I'm sorry. That was a mistake. I corrected it. In is in `*.raw` — Saad, Feb 22 '18 at 18:49

Kings85 · Answer 1 · 2018-03-21T08:15:39.990

The SOX code line that you are using is not at all for raw file conversion, check the SOX full documentation for more info.

Next is an explanation on: what is a raw file, followed by the correct code.

First you need to know that A raw file is a headerless file.

In order to convert raw files into wav, you need to recreate the file header, that consists of:

Sample rate (44100, 16000, 8000, ...) [Hz]
Sample size [bits]
data encoding (floating-point, μ-law, ADPCM, signed-integer PCM)
channels (usually: 1 mono or 2 stereo)

So, as mentioned in this Answer, the format is:

sox -r 16000 -e unsigned -b 8 -c 1 <RAW_FILE> <TARGET_FILE>

This is for the specific case that your raw data is originated from a 16KHz sample rate with 8 bit per sample encoded with unsigned integer, and it is one channel.

Next, for the for loop, you can use any for script that works... So the answer from: tripleee, with this modification will work:

mkdir -p outputdir
for i in rawfiles/*.raw; do
    o=outputdir/${i#rawfiles/}
    sox -r 16000 -e unsigned -b 8 -c 1 "$i" "${o%.raw}.wav"
done

score 1 · Answer 2 · answered Feb 20 '18 at 12:51

1

The script is looking in the current directory. The error message looks like you simply have no files matching the wildcard in the current directory.

I guess you want

mkdir -p outputdir
for i in rawfiles/*.raw; do
    o=outputdir/${i#rawfiles/}
    sox "$i" -r 16000 "${o%.raw}.wav"
done

If you want the files in the current directory, obviously don't create or write to outputdir.

answered Feb 20 '18 at 12:51

tripleee

175,061
34
275
318

I'm getting an error `sox FAIL formats: bad input format for file`.Code inside for loop is this `o = outputdir/${i}` `sox "$i" -r 16000 "${o%.raw}.wav"` – Saad Feb 22 '18 at 18:42
The error seems unrelated to the code you posted; check the `sox` manual page. The spaces around the equals sign would cause a syntax error (unless you have a command named `o` which likes an equals sign as its first argument; the assignment is superfluous if you don't need to trim anything off the beginning of `$i` anyway). – tripleee Feb 23 '18 at 07:03

score -1 · Answer 3 · answered Jan 13 '20 at 02:05

Here is the windows equvilant that may help you. I had this same problem and could not find the solution via here or any other site. So I kicked and moaned and figured it out, you can convert it for use in linux shell "$", but here's the batch convert sox for 96hz 24bit to 48hz 16bit flac to flac. Of course, you can change this to whatever combination you want (i.e. 16b 44.1k).

Create a batch file, i.e: 24b-96hz to 16b-48hz-FLAC.bat

@break off
mkdir ".\FLACOUT\"
FOR %%F IN (".\*.flac") DO sox.exe "%%F" -S -b 16 -r 48k -C 8 ".\FLACOUT\%%~NF.flac"

It will take the *.flac files from your main directory and create a sub called FLACOUT (or whatever you rename it to), and put the newly downsampled files into that subdirectory with the same name and metadata.

Sox batch conversion

3 Answers3