Th flac files may well be high res audio, which the SansaClip+ probably
doesn't support. You may well have to resample them before converting to
mp3.
I used sox to sample my high res flac files, thus:
sox -S in.flac -r 44100 -b 16 out.flac
That resamples to 16 bit samples, and 44.1 Khz sampling rate - that's
what CDs use.
Then convert to mp3 - or maybe sox can write mp3s, too, not sure....
Chris
On 08/03/16 12:18, Peter Alefounder wrote:
> I have a problem with audio format conversion. A company called Naxos
> has started distributing copies of CDs in flac format. I got one of
> these (it turns out to be made up of tracks from other CDs of theirs,
> more or less a sampler, so they aren't giving much away).
>
> The files being rather large, I would like to compress them. I first
> added tags using metaflac - no problem. Then I converted them to mp3
> using avconv. This apparently worked, but my mp3 player (a SansaClip+)
> does not like them. Any attempt to play one causes it to crash.
>
> Examination using Rhythmbox (which can play them) shows that the
> quality is "Unknown" (other mp3s have a specific bitrate). I suspect
> this may be the problem - the player may well require a specific
> bitrate. The quality still appears as "Unknown" even if I specify -b
> 128k or -aq 4 (or both) when using avconv. If I convert to ogg, the
> file size is hardly reduced at all. It is possible that -b and -aq are
> intended only for video formats: in which case, are there any
> equivalent options for audio conversion? - I can't find any using man
> avconv.
>
> Any advice on how to solve this would be welcome.
>
> Peter Alefounder.
>
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