ExoPlayer can't play FLAC file but native MediaPlayer can

[Khang-NT]

Issue description

I can't play this FLAC file with ExoPlayer: Download link - Drive
It says:

UnrecognizedInputFormatException: None of the available extractors (MatroskaExtractor, FragmentedMp4Extractor, Mp4Extractor, Mp3Extractor, AdtsExtractor, Ac3Extractor, TsExtractor, FlvExtractor, OggExtractor, PsExtractor, WavExtractor) could read the stream.

I used ExoPlayer without FLAC extension and this error occurs. FLAC codec is supported on Android 3.1+ which mentioned in Android - Supported Media Formats so it can play perfectly with MediaPlayer (I tested in my devices Android 5.1 and 7.0).

I also tried ExoPlayer with FLAC extension, on Android 5.1 device it plays nothing but noise sound, on Android 7.0 device it can play sound correctly, but I can't seek ( similar with #1808). Note: I can play with native MediaPlayer and seekable as well on both Android 5.1 and 7.0.

Reproduction steps

• Download FLAC file below and play it without using FLAC extension
• ExoPlayer throw error but MediaPlayer does not.
• If test with FLAC extension, please try play on Android 5.1 or lower version.

Link to test content

https://drive.google.com/open?id=1_ykCaUovTcHwsGwNnQpO1k-lVEKKY03G

Version of ExoPlayer being used

I'm using 2.6.0.

Device(s) and version(s) of Android being used

Samsung s7 Android 7.0.
Tablet (unknown name) Android 5.1

A full bug report captured from the device

Source error.
                                                                                    com.google.android.exoplayer2.source.UnrecognizedInputFormatException: None of the available extractors (MatroskaExtractor, FragmentedMp4Extractor, Mp4Extractor, Mp3Extractor, AdtsExtractor, Ac3Extractor, TsExtractor, FlvExtractor, OggExtractor, PsExtractor, WavExtractor) could read the stream.
                                                                                        at com.google.android.exoplayer2.source.ExtractorMediaPeriod$ExtractorHolder.selectExtractor(ExtractorMediaPeriod.java:784)
                                                                                        at com.google.android.exoplayer2.source.ExtractorMediaPeriod$ExtractingLoadable.load(ExtractorMediaPeriod.java:707)
                                                                                        at com.google.android.exoplayer2.upstream.Loader$LoadTask.run(Loader.java:315)
                                                                                        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
                                                                                        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
                                                                                        at java.lang.Thread.run(Thread.java:818)

[erdemguven]

Hi @Khang-NT,

We don't use platform FLAC decoder so you have to use the extension.

I tried the flac file you shared on Android 5 (Nexus 6) with the latest demo app, it plays fine. Please retry on a different device.

As you can see in the issue #1808, as your file doesn't have a seek table, unfortunately you can't seek in exoplayer currently.

[Khang-NT]

Hi, thanks for your response.
I tested again with ExoPlayer demo, the result still is the same. I don't have more device to test, but current result shows that it's quite risk to use FLAC extension, it may not working for all.
Is it possible to fallback to platform decoder, or implement something like PlatformExtractor?

[erdemguven]

It isn't possible use the platform library:
#2352 (comment)

Is the Android 5.1 device able to play other audio files using exoplayer?
Please provide a bug report captured using 'adb bugreport' shortly after reproducing the issue.

[Khang-NT]

Output of adb bugreport exoplayer_demo.log
After play FLAC file using ExoPlayer demo app on Android 5.1 (only hear noise sound).

[Khang-NT]

I guess the noise sound is only in MediaTek devices.

[liungkejin]

I have the same problem in Oppo R9tm Android 5.1 (MTK) phone!

[tonihei]

I'm aware that this issue is quite old, so sorry for the delay. But it looks as if the FLAC extension doesn't work on these devices? This sounds odd given that the whole purpose of these extension decoders is to provide a consistent experience across all devices.

We should probably get hold of one of the devices to test what's happening.

@andrewlewis Are you aware of any similar issues with the software decoders?

[balflear]

Hi guys,
I'm having the same issue with playing FLAC with Exo-Player.
Currently i'm using the Exo-Player demo and device Galaxy S9 with Android 9.

The error is None of the available extractors (MatroskaExtractor, FragmentedMp4Extractor, Mp4Extractor, Mp3Extractor, AdtsExtractor, Ac3Extractor, TsExtractor, FlvExtractor, OggExtractor, PsExtractor, WavExtractor, AmrExtractor, Ac4Extractor, FlacExtractor) could read the stream.
With or without the extension i still can't play the FLAC using ExoPlayer.

Note: on Android 6.0 the error is different, which is another problem i guess...
com.google.android.exoplayer2.demo E/LoadTask: Unexpected exception loading stream java.lang.RuntimeException: com.google.android.exoplayer2.ext.flac.FlacDecoderException: Failed to load decoder native libraries.

[andrewlewis]

The FLAC extension should work from API level 16 onwards. The only reasons reasons I can think of for getting noise output are (1) the device's raw decoder MediaCodec (passing through data output by the FLAC extension's extractor) may be broken or (2) you may be hitting bug #6601 which relates to bit depth changes in playlists.

@balflear If the FLAC extension is set up correctly and you're playing a valid FLAC stream, the exception about "None of the available extractors ..." is unexpected. Behavior should not depend on the device's Android version. Please double check you are using a demo build variant that includes extensions and have followed the steps to build libflac in the extension readme. If you're still stuck after doing that, please provide a link to the media so we can try to reproduce here.

[google-oss-bot]

Hey @Khang-NT. We need more information to resolve this issue but there hasn't been an update in 14 days. I'm marking the issue as stale and if there are no new updates in the next 7 days I will close it automatically.

If you have more information that will help us get to the bottom of this, just add a comment!