Hi Peter, I would suggest to transform all files to a raw format (e.g. without header) - with identical sample rate, bit rate and number of channels - and concatenate them via bash and afterwards encode them in your desired format (e.g. wav). Like so: for file in inputs/*.wav do sox $file -t raw - done | sox -t raw - output.wav As mentioned, you might need to specify bit and sample rate and number of channels manually, though. cheers, Erich On 09.11.2016 10:50, Peter P. wrote: > Dear Sox list, > > I am stumbling over a (known) problem: > > I am trying to concatenate many audio files with > > sox "*.wav" out.wav > > and after some time am getting the error message > > sox FAIL formats: can’t open input file ‘whatever.wav’ : Too many open files > > I have found other people's postings about the same issue, as eg > http://sox.10957.n7.nabble.com/Sox-Too-many-open-files-concatenating-from-playlists-with-a-large-number-of-entries-td5117.html > > The max number of files to be concatenated this way seems to vary in > between operating systems. Or does anyone know exact numbers, or how to > determine the maximum number on a given OS? > > Now I understand that sox is keeping them all opened when concatenating > them, which might be necessary in other cases, as when trying to > normalize them all to a common level. Sadly this seems to impose the > described limit. Or is there another reason why all files have to be > kept open? > > I tried to work around this by recursively concatenating each input file > to a common (growing) output file using a simple bash until loop. The > performance penalty of this is enormous, as the same output file has to > be opened, read and written each time again. > > I am curious what a possible workaround could be, other than dividing > above task between multiple calls of sox, each with a reduced number of > files. > > Thank you for your suggestions and comments, > Peter > > ------------------------------------------------------------------------------ > Developer Access Program for Intel Xeon Phi Processors > Access to Intel Xeon Phi processor-based developer platforms. > With one year of Intel Parallel Studio XE. > Training and support from Colfax. > Order your platform today. http://sdm.link/xeonphi > _______________________________________________ > Sox-users mailing list > Sox-users@xxxxxxxxxxxxxxxxxxxxx > https://lists.sourceforge.net/lists/listinfo/sox-users >
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