Android 6.0 gstreamer 1.0: frame is not writable

[Sebastian Dröge]

On Sa, 2015-12-05 at 18:18 -0800, Gregoire Gentil wrote:
> 
> Analysis:
> - gstreamer 1.6.0 doesn't compile with NDK-r9. Found a similar bug 
> report. Recommendation was to upgrade. It compiles with NDK-r10e.

Yes, there were some API changes on Google's side between r9 and r10
which make this necessary unfortunately. The NDK version is unrelated
to your problem though.

> - gstreamer 1.5.x on Android 6.0 doesn't find the hardware decode,
> hence the software decoding. Found a similar bug report.
> Recommendation was to upgrade. Indeed, gstreamer 1.6.0 fixes this
> problem. But performance is  catastrophic on Nexus 7 2013 + Android
> 5.1.1. I don't know if it's my implementation or a more generic bug.

What does your application / pipeline look like? Are you using playbin?

It would be good to get a debug log as mentioned in my previous mail
for the 1.6.0 case, with playbin.

Also if you want to try latest GIT master, in playbin (or suitable
manual pipelines) it will do zerocopy decoding/rendering and should
provide much higher performance as long as you don't need to look at
the pixel data from the CPU.

> - Software decoder has a NON writable buffer (at least on gstreamer 
> 1.5.0). Temporary fix is to add "buffer = 
> gst_buffer_make_writable(buffer);". I guess that it adds a memcpy.

That's expected currently and this bug:
https://bugzilla.gnome.org/show_bug.cgi?id=740222

Making the buffer writable causes a memcpy() here. Why do you need it
writable in your case?

-- 
Sebastian Dröge, Centricular Ltd · http://www.centricular.com

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