Repository navigation
Live stream quality very bad #346
Description
Zapp version: 8.0.0 tested on Android 10 with Lenova Tablet Tab M10 FHD Plus.
Seems to affect all live streams and to be easy to reproduce with different android versions or HW.
The problem is:
- the picture isn't sharp
- picture and sound aren't synchronous
Version 7.0.4 doesn't show the problems.
Activity
ThomasHeinrichSchmidt commentedon Jan 2, 2023
Zapp version: 8.0.0 tested on Android 11 on Fairphone 3: live stream quality is perfect (trying ARD, ZDF, arte).
cemrich commentedon Jan 2, 2023
I cannot reproduce this issue on my test devices. Are you by any chance connected to a metered network?
Andreas-ddl commentedon Jan 2, 2023
No, I used always wlan. With Smartphones and Android 9, 11, 12 or 13 I couldn't reproduce it neither. My other tablets unfortunately use so old os- versions, that they aren't even supported.
cemrich commentedon Jan 2, 2023
This smells like a network stack issue. I'll try to reproduce this on an emulator.
cemrich commentedon Jan 2, 2023
Das Erste is looking very blurry and most definitely not HD on the Android 10 emulator. ZDF and Arte are looking file.
cemrich commentedon Jan 2, 2023
Note to self: Switching back to DefaultDataSource instead of OkHttpDataSource in ExoPlayer does not resolve this issue.
cemrich commentedon Jan 2, 2023
I can confirm that this issue did not exist in version 7.0.4. I updated exoplayer from 2.17.1 to 2.18.2. Further experimentation shows, that the issue only occurs with exoplayer 2.18.2 (not 2.18.1 or below). So I would assume, that this is a bug in the library. As for now there is now newer version available.
cemrich commentedon Jan 2, 2023
I passed this issue to google.
cemrich commentedon Jan 5, 2023
@Andreas-ddl Is there any other device you can reproduce this issue with? If not, this may be a device specific system bug of the Lenova Tablet, underreporting the framerate it is able to play back.
Andreas-ddl commentedon Jan 6, 2023
No, cannot reproduce it with other devices. But also is only item with Android 10.
I also made some more tests. I can confirm that it doesn't concern all channels but definitely "ARD".
cemrich commentedon Jan 6, 2023
@Andreas-ddl Thank you very much for testing! I'll treat this as a hardware bug for the time beeing. The behaviour of exo player seems to be "correct" (at least to spec). This is nothing that should be fixed by Zapp. Sorry!
cemrich commentedon Jan 31, 2023
@neustrelitzer Danke für den Hinweis! Zapp sollte den ARD-Stream eigentlich in FHD anzeigen können, wenn das Gerät den Codec, die Framerate und die Videogröße unterstützt. Wir schränken da nichts ein.
cemrich commentedon Jan 31, 2023
Es kann sein, dass ExoPlayer es deswegen nicht zulässt. Es kann aber auch der gleich "Bug" sein, wie bei dem Gerät oben. Ich hoffe, dass die Probleme mit dem nächsten Release von ExoPlayer etwas nachlassen.