player.play() doesn't correctly handle sound files with non-default format

[iarspider]

I'm trying to use the new Sounds ext, and I have noticed that playing mp3 files with only one channel produces weird result - I'd say the file is played at 2x speed, or the pitch is shifted up. Converting the file to stereo fixes the issue.

MediaInfo output for mono file:

General
Complete name                            : Minion General Speech@ignore@ForMe01.mp3
Format                                   : MPEG Audio
File size                                : 25.3 KiB
Duration                                 : 1 s 619 ms
Overall bit rate mode                    : Constant
Overall bit rate                         : 128 kb/s
Genre                                    : Other

Audio
Format                                   : MPEG Audio
Format version                           : Version 1
Format profile                           : Layer 3
Duration                                 : 1 s 620 ms
Bit rate mode                            : Constant
Bit rate                                 : 128 kb/s
Channel(s)                               : 1 channel
Sampling rate                            : 44.1 kHz
Frame rate                               : 38.281 FPS (1152 SPF)
Compression mode                         : Lossy
Stream size                              : 25.3 KiB (100%)

MediaInfo output for stereo file:

General
Complete name                            : Minion General Speech@ignore@ForMe01.mp3
Format                                   : MPEG Audio
File size                                : 26.0 KiB
Duration                                 : 1 s 645 ms
Overall bit rate mode                    : Constant
Overall bit rate                         : 128 kb/s
Genre                                    : Other
Writing library                          : LAME3.100

Audio
Format                                   : MPEG Audio
Format version                           : Version 1
Format profile                           : Layer 3
Format settings                          : Joint stereo / MS Stereo
Duration                                 : 1 s 646 ms
Bit rate mode                            : Constant
Bit rate                                 : 128 kb/s
Channel(s)                               : 2 channels
Sampling rate                            : 44.1 kHz
Frame rate                               : 38.281 FPS (1152 SPF)
Compression mode                         : Lossy
Stream size                              : 25.7 KiB (99%)
Writing library                          : LAME3.100

[github-actions]

Hello! Thanks for the issue. If this is a general help question, for a faster response consider joining the official Discord Server

Else if you have an issue with the library please wait for someone to help you here.

[iarspider]

I don't have any 5.1 or 7.1 files, but I would guess they will also be handled incorrectly, maybe the pitch will shift down?

[iarspider]

So, a small update: player.play() expects the sound file to be in one specific format: 44.1 kHz, 128 kb/s, 2 channels. If any of the parameters are off, the sound will not be played correctly. I think (but don't have time to test it) that adding

-ab 128 -ar 44100 -ac 2

before pipe:1 in ffmpeg invocation here and maybe here will help.

[plomdawg]

can confirm - my mono .mp3s also play super fast

until I changed the lines as suggested above:

            self.proc = subprocess.Popen(
                [
                    ffmpeg_bin,
                    "-i",
                    source,
                    "-loglevel",
                    "panic",
                    "-vn",
                    "-f",
                    "s16le",
                    "-ab",
                    "128",
                    "-ar",
                    "44100",
                    "-ac",
                    "2",
                    "pipe:1",
                ],

[sockheadrps]

This is where the sample rate is hard coded. It just appears like this just isnt finished, and local files havnt been fully covered yet. Idk if theres a better way, maybe try to read in sample rate from meta data on audio, but I made a PR to at least allow you to set the values of those things that way we dont have to change the library code anymore lol

[enekochan]

The actual rate right now for the audio files must be converted to 48000 and not 44100. I don't think this is mentioned in the docs anywhere and is not trivial find this solution.

Is there a problem to merge the PR by @sockheadrps?

[IAmTomahawkx]

Is there a problem to merge the PR by @sockheadrps?

I forgot it existed :)
There's a couple meta issues with the pr, but once they've been fixed it can be merged

[sockheadrps]

I think this issue can be closed since #454 addressed the problem in this issue by detecting sample rate and channels from the audio meta data, and exposing both properties with setters just in case the meta data isn’t accurate.

[iarspider]

Thanks for looking into it. With this update however, I'm getting weird results - if I play two sounds in a row, the second one isn't played, and holds the file open for eternity. I will try to post a reproducer later.