On Sat, November 7, 2020 1:04 am, John Murphy wrote: > On Fri, 6 Nov 2020 15:19:22 -0600 "Chris Caudle" wrote: > >> What does sndfile-info show about t1w64.w64 and t2wav.wav files? I >> tried >> using sox to convert a float file I had in an Ardour project directory >> to >> PCM, and sndfile-info reported the exact same maximum value for both. >> Using the sox stat effect also displayed the same maximum and minimum >> for >> original and converted file as well, but sndfile-info might give you >> some >> insight into why sox did not seem to show the same value. > > Side by side for easy comparison: > > File : t1w64.w64 t2wav.wav > Length : 3840136 1920044 > riff : 3840136 1920036 > wave > fmt : 40 16 > Format : 0x3 => WAVE_FORMAT_IEEE_FLOAT 0x1 => WAVE_FORMAT_PCM > Channels : 2 2 > Sample Rate : 48000 48000 > Block Align : 8 4 > Bit Width : 32 16 > Bytes/sec : 384000 192000 > fact : 32 > frames : 480000 > data : 3840024 > End > ----------------------------------------------------------------------- > Sample Rate : 48000 48000 > Frames : 480000 480000 > Channels : 2 2 > Format : 0x000B0006 0x00010002 > Sections : 1 1 > Seekable : TRUE TRUE > Duration : 00:00:10.000 00:00:10.000 > Signal Max : 0.584686 (-4.66 dB) 32767 (-0.00 dB) > > That last 'Signal Max' comparison does seem to confirm that > normalisation has occurred. > That is different than the results on my system, even though I used the same SoX command line you showed before. I don't know if that implies some difference between versions of SoX, or different compile time options, or different versions of sndfile-lib installed on my system (Fedora 33 just for info). sox-14.4.2.0-29.fc33.x86_64 libsndfile-1.0.28-13.fc33.x86_64 I am a bit surprised that change gain would be a default behavior, definitely not what I would expect from just attempting to change the file format. -- Chris Caudle _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx https://lists.linuxaudio.org/listinfo/linux-audio-user
