kidhazy wrote: 
> Is there an option (maybe via ffmpeg config parameter?) that can be used
> to increase the volume for the stream?

Volume is part of ffmpeg audio filters (see
https://ffmpeg.org/ffmpeg-filters.html#Audio-Filters) which has a
section on volume  filter (
https://ffmpeg.org/ffmpeg-filters.html#volume ) also
https://trac.ffmpeg.org/wiki/AudioVolume

The change will affect all stream that use PlayHLS.  You need to dstop
LMS,  edit custom-convert.conf for PlayHLS and then restart LMS. On
WIndows be careful of the editor used - do NOT use NOTEPAD - Wordpad
maybe OK - this is to do with line endings.

I did a quick test and the following change seems to work. Addition in
red. Position is critical it must be immediately after the "-i $FILE$ "

Code:
--------------------
    
  # PlayHLS rules to start convert application for Linux
  hls mp3 * *
        # RB:{BITRATE=-B %B}T:{START=-ss %s}
        [ffmpeg] -loglevel quiet  -i $FILE$ -af volume=10.0dB -f wav - | [lame] 
--silent -q $QUALITY$ $BITRATE$ - -
  
  hls pcm * *
        # RB:{BITRATE=-B %B}T:{START=-ss %s}
        [ffmpeg] -loglevel quiet  -i $FILE$ -af volume=10.0dB -f u16le -
  
  hls flc * *
        # RB:{BITRATE=-B %B}T:{START=-ss %s}
        [ffmpeg] -loglevel quiet -i $FILE$ -af volume=10.0dB -f flac -
  
--------------------


You can use volume=<number> such as 1.5 (e.g. volume=1.5) to increase
volume by 50% or volume=0.5 to decrease volume by 50%.  By add "dB" the
volume is change is in decibels - positive is increase volume, negative
is decrease volume.


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