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simoncn · (This post was last modified: 03-01-2014 12:47 by simoncn.)

(18-12-2013 11:48)simoncn Wrote: It appears there was an incompatible change to the spelling of an ffmpeg option in November 2012. Before that date, this option was specified as '-request_sample_fmt flt' and after that date it was specified as '-request_sample_fmt float'. The problem with ALAC and Synology is caused by MinimStreamer's use of the older 'flt' syntax, which is rejected by the newer ffmpeg version installed by Synology.

The best solution I can think of at the moment is for MinimStreamer to do "dummy" invocations of ffmpeg with each spelling to find the spelling that works, then use this spelling in the "real" invocation of ffmpeg.

(18-12-2013 23:20)simoncn Wrote: Yes, and before I do this I will think very hard about whether there's a better way. I don't understand what the FFmpeg developers were thinking when they made this incompatible change.

I've done more investigation into this option spelling change, and the situation is different from what I posted prevously.

The correct and current spelling of this option is '-request_sample_fmt flt' as used by MinimStreamer. Unfortunately, the version of ffmpeg included in Synology DSM is a patched version of ffmpeg 0.7.x (a very old version) and this Synology version uses the incorrect spelling '-request_sample_fmt float' for this option and is therefore incompatible with MinimStreamer.

My apologies to the FFmpeg developers for accusing them of making an incompatible change. The problem is caused by the Synology developers, not the FFmpeg developers.

I am investigating possible solutions for this Synology MinimStreamer issue. This is likely to require MinimStreamer to detect that the patched Synology version of 0.7.x is being used and apply a workaround.