Invalid Nal Length Error In Playing Encrypted video online

[MohsenNaderzadeh]

Hi, I have an encrypted video stored on the server which I want to play in Exoplayer. I am using this repo custom datasource for playing encrypted video offline. For online playback, I added some code from Exoplayer DefaultHttpDataSource to implement the setupInputStream function from the server instead of the local file. The video plays but when I change the seekbar position after a few moments, I get an Invalid Nal Length Error and OnPlayerError is called. My Encryption Alghoritm is AES/CTR/NOPadding

[tianyif]

Hi @MohsenNaderzadeh,

Did you try to reproduce the issue with the demo app? If the problem happens on the demo app, could you please provide us the media so that we can investigate on our end?

Thanks!

[droplet-js]

i have same issue

def exoplayer_version = "2.18.7"
implementation "com.google.android.exoplayer:exoplayer-core:${exoplayer_version}"
implementation "com.google.android.exoplayer:exoplayer-hls:${exoplayer_version}"
implementation "com.google.android.exoplayer:exoplayer-dash:${exoplayer_version}"
implementation "com.google.android.exoplayer:exoplayer-smoothstreaming:${exoplayer_version}"

E/ExoPlayerImplInternal( 4684): Playback error
E/ExoPlayerImplInternal( 4684):   com.google.android.exoplayer2.ExoPlaybackException: Source error
E/ExoPlayerImplInternal( 4684):       at com.google.android.exoplayer2.ExoPlayerImplInternal.handleIoException(ExoPlayerImplInternal.java:644)
E/ExoPlayerImplInternal( 4684):       at com.google.android.exoplayer2.ExoPlayerImplInternal.handleMessage(ExoPlayerImplInternal.java:614)
E/ExoPlayerImplInternal( 4684):       at android.os.Handler.dispatchMessage(Handler.java:106)
E/ExoPlayerImplInternal( 4684):       at android.os.Looper.loop(Looper.java:219)
E/ExoPlayerImplInternal( 4684):       at android.os.HandlerThread.run(HandlerThread.java:67)
E/ExoPlayerImplInternal( 4684):   Caused by: com.google.android.exoplayer2.ParserException: Invalid NAL length
E/ExoPlayerImplInternal( 4684):       at com.google.android.exoplayer2.extractor.mp4.Mp4Extractor.readSample(Mp4Extractor.java:641)
E/ExoPlayerImplInternal( 4684):       at com.google.android.exoplayer2.extractor.mp4.Mp4Extractor.read(Mp4Extractor.java:259)
E/ExoPlayerImplInternal( 4684):       at com.google.android.exoplayer2.source.BundledExtractorsAdapter.read(BundledExtractorsAdapter.java:127)
E/ExoPlayerImplInternal( 4684):       at com.google.android.exoplayer2.source.ProgressiveMediaPeriod$ExtractingLoadable.load(ProgressiveMediaPeriod.java:1039)
E/ExoPlayerImplInternal( 4684):       at com.google.android.exoplayer2.upstream.Loader$LoadTask.run(Loader.java:412)
E/ExoPlayerImplInternal( 4684):       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
E/ExoPlayerImplInternal( 4684):       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
E/ExoPlayerImplInternal( 4684):       at java.lang.Thread.run(Thread.java:929)

[MohsenNaderzadeh]

Hi @tianyif, My video is encrypted with the encryption algorithm as I said, Can I play it with the demo app? Is it possible?

[icbaker]

If you've written a custom DataSource I recommend testing it with a subclass of DataSourceContractTest to check you implemented the interface correctly and fully. More info here: https://medium.com/google-exoplayer/standardising-datasource-implementations-through-testing-b7a8ab04f8d1

From the description (seeking breaks things) it sounds like possibly your implementation doesn't handle being closed and re-opened? Bit of a guess.

[MohsenNaderzadeh]

Hi @icbaker, I added DefaultHttpDataSourceContractTest as a test subclass of DataSourceContractTest. As a part of the test, I passed Exoplayer's own DefaultHttpDataSource as an implementation of the createDataSource function. All of the tests passed except for two that are related to Mockito and unit testing. I am currently unable to resolve these errors and run the test class successfully. Once I have resolved these issues and successfully run the test class, I will proceed to test my own custom data source. Please keep my issue open until I have resolved the errors and run the test class successfully.

[icbaker]

Not sure if you've already seen it, but you might want to take a look at our DefaultHttpDataSourceContractTest and the HttpDataSourceTestEnv it uses to set up serving test data at various URLs using Square's MockWebServer.