Not sure if this will solve your issue but I use mp3fs to convert my flacs to mp3.
Once set up (can be done though fstab). It provide a file system containing mp3 files that corresponds to the stored music in the input directory.
The files are lazily converted in 2 stages. This means that if you run an ls on the dir it will only convert the file names and make an estimate of the final file size. Upon trying to access it will start the conversion this is generally fast enough for play back but can make contact notable slower.
No support for variable bit rate (VBR) (well when I set it up) . I find this system really useful.
As for your problem I don't really know. But I have a hypothesis that you are producing VBR mp3s that your player does not support. Like I said this is only a guess. Possible try forcing a constant bit rate (CBR) mp3. Using the --cbr flag in lame check man page for avconv or any other software.
If you think your player should support vbr then you may need the old vbr algorithm.
Check out lame manual it really is very informative and gives insight to the mp3 format without having to trawl the standard including the one your mp3 player uses.
If you just want to get this to work, you may be best off converting from flac to wav, then use your normal method to go from wav to mp3.
Hope some of the above may help.
Ben
On 9 March 2016 18:17:47 GMT+00:00, Chris Liddell <cjl@???> wrote:
>On 09/03/16 18:04, Gordon Scott wrote:
>> On Wed, 2016-03-09 at 17:31 +0000, Peter Alefounder wrote:
>>
>>> Thanks to all for the comments. I still think something I could use
>>> from the command line would be easier - a simple shell script loop.
>>
>> Did you look further at sox for conversion?
>>
>> Chris Liddell said he used it to resample, but it does many more
>things
>> than that.
>>
>> You may well find that the following just works:
>>
>> sox mytrack.flac mytrack.mp3
>>
>> If not, try deliberately converting in two stages:
>>
>> sox mytrack.flac mytrack.wav
>> sox mytrack.wav mytrack.mp3
>>
>> That would allow you to verify that the .wav itself is sensible.
>
>Historically, not many distros package sox with MP3 support 'cause of
>the patent license issues - I don't know if that's changed much, these
>days.
>
>I tend to use "lame" directly because, well, I've been doing this kind
>of stuff for a while, and back then, lame was the only choice.....
>
>And I tend to use "flac" for flacs, just because....
>
>
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