[FFmpeg-user] issue with DTS 5.1 to wav 2.0 (sort of bug report?)

roger21 roger21 at free.fr
Tue Mar 25 14:31:29 CET 2014


when trying to convert a 5.1 audio source into wav i  got a weird 
result, the mix sounds like only two channel are kept and it is very low

here the original command :

ffmpeg.exe -i "source.mkv" -c:a pcm_s16le -ac 2 "audio.wav"

when i do the same conversion to mp3 or vorbis i got a fully ok result, 
the sound is clear and loud, i got the reverb effects and all

ffmpeg.exe -i "source.mkv" -c:a libmp3lame -r:a 48K -b:a 192K 
-compression_level 0 -ac 2 "audio.mp3"

so as a workaround i used -af pan and the result is all fine

ffmpeg.exe -i "source.mkv" -c:a pcm_s16le -af 
"pan=stereo|FL=FL+0.5*FC+SL+0.5*LFE|FR=FR+0.5FC+SR+0.5*LFE" "audio.wav"

but as the doc said i shouldn't use it for normal downmixing

so not really a question again, just a concern or something (i don't 
think  i did something wrong in my command line but that is always a 


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