Error: Attempt to call getDuration in wrong state

[VictorUvarov]

I get the following error when trying to get duration for a remote URL. I am trying to get the duration to load before I show the widget because it is really confusing for the user to see a position of 0 and a duration of 0.

• Platform: Android
• Code

AudioPlayer _audioPlayer = AudioPlayer();
final url = 'https://www.sample-videos.com/audio/mp3/crowd-cheering.mp3'
int success = await _audioPlayer.setUrl(url);

if (success == 1) {
    int duration = await _audioPlayer.getDuration();
}

• Error

V/MediaHTTPService(13455): MediaHTTPService(android.media.MediaHTTPService@12f1aa7): Cookies: null
V/MediaHTTPService(13455): makeHTTPConnection: CookieHandler (java.net.CookieManager@c5f5f0f) exists.
V/MediaHTTPService(13455): makeHTTPConnection(android.media.MediaHTTPService@12f1aa7): cookieHandler: java.net.CookieManager@c5f5f0f Cookies: null
V/MediaHTTPService(13455): MediaHTTPService(android.media.MediaHTTPService@1e47afd): Cookies: null
V/MediaHTTPService(13455): makeHTTPConnection: CookieHandler (java.net.CookieManager@c5f5f0f) exists.
V/MediaHTTPService(13455): makeHTTPConnection(android.media.MediaHTTPService@1e47afd): cookieHandler: java.net.CookieManager@c5f5f0f Cookies: null
V/MediaHTTPService(13455): MediaHTTPService(android.media.MediaHTTPService@86fa3f2): Cookies: null
V/MediaHTTPService(13455): makeHTTPConnection: CookieHandler (java.net.CookieManager@c5f5f0f) exists.
V/MediaHTTPService(13455): makeHTTPConnection(android.media.MediaHTTPService@86fa3f2): cookieHandler: java.net.CookieManager@c5f5f0f Cookies: null
E/MediaPlayerNative(13455): Attempt to call getDuration in wrong state: mPlayer=0x79ec7b73c0, mCurrentState=4
E/MediaPlayerNative(13455): error (-38, 0)
E/MediaPlayer(13455): Error (-38,0)
V/MediaPlayer(13455): resetDrmState:  mDrmInfo=null mDrmProvisioningThread=null mPrepareDrmInProgress=false mActiveDrmScheme=false
V/MediaPlayer(13455): cleanDrmObj: mDrmObj=null mDrmSessionId=null
V/MediaPlayer(13455): resetDrmState:  mDrmInfo=null mDrmProvisioningThread=null mPrepareDrmInProgress=false mActiveDrmScheme=false
V/MediaPlayer(13455): cleanDrmObj: mDrmObj=null mDrmSessionId=null

[kaifiappsmaven]

While initializing audio player use below method -
_durationSubscription =
Injector.getAUdio().onDurationChanged.listen((duration) {
if (!mounted) return;
setState(() {
if (_playerState != PlayerState.paused ||
_playerState != PlayerState.stopped) {
_duration = duration;
}
});
});
It will return duration of audio.
In meantime this value is fetched, you can show streaming.. function. When this value is update show it in widget

[VictorUvarov]

I already listen for onDurationChanged. I would like to show the user the duration of the audio before it starts playing.

[erickzanardo]

You can get the duration without playing, check this on the example app: https://github.com/luanpotter/audioplayers/blob/master/example/lib/main.dart#L112

[VictorUvarov]

Yes, I have done that, but I still get the same error.

An exception has occurred.
PlatformException (PlatformException(error, Unsupported value: java.lang.IllegalStateException, null))

Some reason it keeps complaining about attachNewPlayer called in state 4
Is there an example for remote URL duration?
I added the demo to the example of my fork https://github.com/VictorUvarov/audioplayers?organization=VictorUvarov&organization=VictorUvarov

[shikha1992]

As suggested by @erickzanardo , above example to fetch duration is working fine. I implemented same in demo.
Future _getDuration() async {
int duration = await Future.delayed(Duration(seconds: 0), () => Injector.getAUdio().getDuration());
debugPrint('duration$duration');
_duration = Duration(milliseconds: duration);
return duration;
}
After initializing audioplayer, duration is fetched after passing url to audioplayer.

[VictorUvarov]

Did you test with a remote URL? For example, https://file-examples.com/wp-content/uploads/2017/11/file_example_MP3_700KB.mp3 Or does getDuration() only work with local asset files? If you get it to work with remote URL I would love to see the function for getting a remote URL duration.

[VictorUvarov]

Turns out the duration is working correctly. The files I was testing were not in the proper format.

[volgin]

The solution proposed by @shikha1992 does not work, unless I set duration of a delay to 500ms (at 250ms it works sometimes). This is definitely a bug.

The same code for iOs works without a delay.

[Nailik]

I had the same Problem with getDuration and when i want to read mp3 Tags, i don't want a 250-500ms delay for every single song.
The best way to get the duration ist maybe https://pub.dev/packages/flutter_ffmpeg (Flutter FFMPEG).
It can also read title etc and audio-tls supports down to android 16

[chornbe]

I've had to implement the delay. I went through hoop after hoop after hoop. Ultimately, I just elected to NOT show or care about the duration until playback started :(

Seems I have a lot of flutter code that basically says:

if( true == isAndroid ) { /* do all the workaround stuff here because android */ }

:(

[xiaoxin-sky]

The solution proposed by @shikha1992 does not work, unless I set duration of a delay to 500ms (at 250ms it works sometimes). This is definitely a bug.

The same code for iOs works without a delay.

Thanks，I fixed the problem with delay 300ms in Android