| Thursday, July 11th, 2019, 01:06 UTC | ||
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| [07:15:01] | warpme_: | markk_: here is what Qiang said about lima black screen playback: ?One possible reason I can think of is YUV support of lima driver. Some |
| [07:15:01] | warpme_: | GPU support YUV texture import from V4L2 directly and sampling. But |
| [07:15:01] | warpme_: | lima needs user to do YUV to RGB conversion with a shader in the |
| [07:15:01] | warpme_: | middle.? |
| [07:23:06] | warpme_: | it looks like interesting as current master gives me ok playback screen with iirc argb or (some like this; don?t have access to verify this at the moment). |
| [07:23:36] | warpme_: | Qiang also says: ?You may check the code path how video buffer is used by GLES to narrow |
| [07:23:36] | warpme_: | down the problem happens in: |
| [07:23:37] | warpme_: | 1. lima import V4L2 buffer |
| [07:23:38] | warpme_: | 2. do YUV to RGB conversion? |
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| [09:20:38] | markk_: | warpme_: v4l2 isn't relevant for the GLES issue with lima. The normal code path doesn't touch it. Do you have apitrace installed? or can you install it? it will help me and will probably help Qiang if he can see what is happening. |
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| [09:25:35] | markk_: | warpme_: I've just emailed you an apitrace using this mornings render branch run on my pi3 with opensource gl and software decode. it was generated with: apitrace trace -a egl mythfrontend -v playback,gpu |
| [09:26:44] | markk_: | if you install qapitrace (on any machine) – it will show what opengl calls are made – frame by frame. it would be useful to generate similar output for lima – it should be similar. |
| [09:28:09] | markk_: | it can also be played back on a different machine – which may be very useful. |
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| [10:35:24] | warpme_: | markk_: v4l2 was metioned by Qiang as I describe him: we want to resolve lima black screen rendering becasue we want test v4l2 on amlogic. By context he thinks we are already rendering from v4l2 to gles surface. While this is not case for now – Qiang says ?lima needs user to do YUV to RGB conversion with a shader in the middle?. I understand this is OK in current code? (this statement sounds to me like kind of lima limitation – probably |
| [10:35:24] | warpme_: | limitation not present in rpi vc4/v3d)? |
| [10:36:40] | warpme_: | ofcourse I?ll try to play with apitrace – but first I need to cross-compile it for my distro.... |
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| [13:46:31] | warpme_: | markk_: Qiang already replayed api trace You send me by e-mail and he tells me: „I see black screenâ€. Is this expected from trace You send me? (iirc it was from working rpi3 – so should be there black screen seen on this trace replay?) |
| [14:18:51] | warpme_: | ah – I see. It is at GL level – so apitrace data is platform independent of course. silly me…. |
| [14:20:42] | stuarta: | it sounds promising that Qiang also sees a black screen, it implies he would be able to determine where the problem may lie |
| [14:21:44] | warpme_: | indeed. He confirmed: „I haven't seen any lima unsupported GLES API and shader operation in |
| [14:21:45] | warpme_: | the trace, so there should be some bug in lima driver (maybe the |
| [14:21:46] | warpme_: | fragment shader compiler).†|
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| [22:37:33] | markspieth2: | Has anyone tried mythfrontend via a VPN? |
| [22:38:48] | markspieth2: | I was in bali last week and took my shield and tried it. Did not work very well even though I had fibre at both ends. Streaming from home the same ts file via http and vlc worked fine via the VPN. |
| [22:39:09] | markspieth2: | Latency was approx 150ms. |
| [22:39:41] | markspieth2: | Must be some sort of issue with the way media is stream that is latency sensitive. |
| [22:40:22] | markspieth2: | Also startup was slow too. This is the stage that does a lot of mysql acesses. |
| [22:40:27] | markspieth2: | Thoughts? |
| [22:40:56] | markspieth2: | Note: I used openvpn for android and linux via udp. |
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| [23:23:56] | gigem: | markspieth2: I've never tried it but I probably can tomorrow. |
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