Green Line libvlc Android

[pecana]

Hello, i'm using the libvlc for Android to play video, but if the hardware acceleration is activated a greenline appear at the bottom of the video.
Is there a way to solve the issue?

Thank you

[pecana]

No one?

[Jean-Baptiste Kempf]

Is it an interlaced video? Does it look like https://trac.videolan.org/vlc/ticket/16908#comment:10 ?

[pecana]

Hello , how could i know it? it's a streaming video in .TS format.
If this is the case how can I deactivate / axtivate the interlacing by libvlc options?

Thank you

[pecana]

I tryed in verbose and i get this:
D/VLC: [5dfffc38/0] core libvlc: VLC media player - 3.0.0-git Vetinari
D/VLC: [5dfffc38/0] core libvlc: Copyright © 1996-2016 the VideoLAN team
D/VLC: [5dfffc38/0] core libvlc: revision 2.2.0-git-7754-gd273581
D/VLC: [635787c8/5dc9] core video output: deinterlace 0, mode blend, is_needed 0
D/VLC: [635787c8/5dcc] core video output: Detected interlaced video
D/VLC: [635787c8/5dcc] core video output: deinterlace 0, mode blend, is_needed 1

If it can help, it seems to appears on videos which have a non standard format. For example i see the green bar on video where the resolution is seen by the vlclib as 1280x728 or 1280x736 instead of 1280x720, how could this be possibile ?

[pecana]

Alone Again

[pecana]

Hello?
Is that a bug?

Will it be fixed?

[renatas]

managed to fix problem changing deinterlace method (blend was default). I am using

Code: Select all

--sout-deinterlace-mode=yadif

but worked with discard and yadif2x too.

[pecana]

managed to fix problem changing deinterlace method (blend was default). I am using

Code: Select all

--sout-deinterlace-mode=yadif

but worked with discard and yadif2x too.

hello, thank you!

I will check it today, it happen only on the Android TV instead on the tablet and phone it works well

[pecana]

managed to fix problem changing deinterlace method (blend was default). I am using

Code: Select all

--sout-deinterlace-mode=yadif

but worked with discard and yadif2x too.

Did you set others parameters?
It seems to have no effect at all looking at the debug log:

06-23 14:41:56.800 6591-21891 D/VLC: [68310960/5583] core video output: Deinterlacing available
06-23 14:41:56.800 6591-21891 D/VLC: [68310960/5583] core video output: deinterlace 0, mode blend, is_needed 0
06-23 14:41:57.405 6591-21895 D/VLC: [68310960/5587] core video output: deinterlace 0, mode blend, is_needed 1

Thank you

[pecana]

Got it , I had to add also

--video-filter=deinterlace

Now I will try on the TV

[pecana]

No luck

The green bar is still present if the hardware acceleration is active

[renatas]

These options helped me. I don't really know if "--deinterlace=-1" is needed (0 (Off), -1 (Automatic), 1 (On)).

Code: Select all

--video-filter=deinterlace --deinterlace=-1 --sout-deinterlace-mode=yadif

Had frame rate drops when using "yadif" on slower device (Samsung Tab 3 10.1 GT-P5200). But

Code: Select all

--sout-deinterlace-mode=bob

solved it.
I have to do some more testing. Will post results if I find anything useful.

[ssbmaccom]

My experience with deinterlaceds is mixed - but this is simply due to the methods used for it.
BoB is usually quite fine, but typography is not steady - which annoys me.
Linear is a bit better (it is BoB with linear interpolation).
Yadif is really quite good, but requires a really fast device. For my App (on tvOS) Yadif is fine for SD-Video (576i), but with 1080i I get lots of drop frames. At the end, I gave the user the choice to select the deinterlacer, if they are not happy with the default of using blend.

[pecana]

These options helped me. I don't really know if "--deinterlace=-1" is needed (0 (Off), -1 (Automatic), 1 (On)).

Code: Select all

--video-filter=deinterlace --deinterlace=-1 --sout-deinterlace-mode=yadif

Had frame rate drops when using "yadif" on slower device (Samsung Tab 3 10.1 GT-P5200). But

Code: Select all

--sout-deinterlace-mode=bob

solved it.
I have to do some more testing. Will post results if I find anything useful.

Hello, Thank you for the suggestion, i will vive it a try

[pecana]

The parameters are the same I use but the greenline remains

[Jean-Baptiste Kempf]

Try to avoid hw acceleration.

[pecana]

Try to avoid hw acceleration.

Also by setting it as automatic will give the same result and, by the way, I don't think deactivating the HW acceleration is a fix...
In some devices disabling the HW acceleration wil make the video unplayable, the video become really slow and cause many block, otherwise with the HW acceleration active run smootly but with a green bar.
It seems to happen on video where the format is out of standard (1280x736)
Any real suggestion or fix?

[Jean-Baptiste Kempf]

Sure, but does it remove the green bar?

[pecana]

Sure, but does it remove the green bar?

Yes but it make the player useless because you cannot watch it at 3 FPS.
In other device setting the acceleration to decoding works, in other devices where the HW acceleration set to full work well the decoding will cause the greenline bar. What is this bug caused by?

Thank you

[Jean-Baptiste Kempf]

MediaCodec implementation.

[pecana]

MediaCodec implementation.

Leaving the acceleration disabled and adding this options:

options.add("--no-skip-frames");
options.add("--no-drop-late-frames");
options.add("--avcodec-skip-frame");
options.add("0");
options.add("--avcodec-skip-idct");
options.add("0");

make the player working correctly and without green bar.
Otherwise setting acceleration to automatic, full or encoding cause the greenline (but not on all the stream)

[pecana]

Making some more test i noticed that the greenline appears where the video size is strange:

D/VLC: [62395858/738] core video output: Deinterlacing available
D/VLC: [62395858/738] core video output: deinterlace 0, mode blend, is_needed 0
D/VLC: [62395858/73c] core video output: Opening vout display wrapper
D/VLC: [62395858/73c] core video output: original format sz 1280x736, of (0,0), vsz 1280x728, 4cc ANOP, sar 1:1, msk r0x0 g0x0 b0x0
D/VLC: [62395858/73c] core video output: Detected interlaced video
D/VLC: [62395858/73c] core video output: deinterlace 0, mode blend, is_needed 1
D/VLC: [62395858/72b] core video output: destroying useless vout

Otherwise the greenline does not appears if the formati is different

D/VLC: [664c9c28/187a] core video output: Deinterlacing available
D/VLC: [664c9c28/187a] core video output: deinterlace 0, mode blend, is_needed 0
D/VLC: [664c9c28/187e] core video output: Opening vout display wrapper
D/VLC: [664c9c28/187e] core video output: original format sz 1280x720, of (0,0), vsz 1280x720, 4cc ANOP, sar 1:1, msk r0x0 g0x0 b0x0
D/VLC: [664c9c28/187e] core video output: Detected interlaced video
D/VLC: [664c9c28/187e] core video output: deinterlace 0, mode blend, is_needed 1

Is a libvlc issue or a video issue?

[pecana]

Hello???

[Jean-Baptiste Kempf]

This is fixed.