Poor video decoding performance of libTVVLCKit.a

[jasin755]

Good day,

I compiled MovileVLCKit as static libTVVLCKit.a. Video playback works good if I use UIView with small dimensions. But if you set the dimensions to Full HD. Playing lags (CPU usage cca 110%).

[zasuk]

i have the same problem...and after a while streams don't play and i get VLCMediaPlayerStateStopped every time.
i also want to have two videos playing at same time (one is a preview of the next one) but that is not possible right now.

[fkuehne]

The tvOS SDK does not include the VideoToolbox framework at this point so we can't do hardware accelerated H264 decoding. We filed a radar on that, but no response so far. If you want efficient video decoding on tvOS, do the same.

For network streams, there is a regression in our code which we are aware off and will resolve (a busy loop in the network handling code), so performance will get better.

[jasin755]

@Felix Paul Kuehne I tryed decoding same video and audio with ffmpeg and no problem. I is very fast.

[fkuehne]

Sample code from you needed then.

Further, are you actually testing on device?

[jasin755]

No I tested on simulator. Device will be available month later :/

Sample code of ffmpeg or tvkit?

[fkuehne]

A sample showing the use of our code. I can't help with ffmpeg.

Further, since you don't test on device, it doesn't mean anything regarding the CPU load.

Finally, are you playing a network stream? if yes, what kind of?

Without such basic information, there is absolutely no way we can help.

[zasuk]

btw i have the new ATV so if you need i can test on the device...

[matrog]

I'm testing a network stream (over LAN) from a DVB source, video is working almost fine...audio is terrible...scattered audio.

I'm testing on a real ATV.

[fkuehne]

What's the used network streaming protocol?

[matrog]

http

I'm using a URL like this

Code: Select all

http://10.20.101.5:8001/1:0:1:265:200:1D:EEEE0000:0:0:0:

PS: opened a bug report about VideoToolkit..let's wait for Apple

[fkuehne]

Thanks for filing a radar on that.

Regarding the actual topic of this thread: this is a regression in our networking code which results in a busy loop. We hope to be able to fix it shortly but it affects all platforms and is absolutely not related to tvOS.

[matrog]

ok, please let me know and I will test it

[jasin755]

@Felix Paul Kuehne this is my sample project on OneDrive: http://1drv.ms/1LZRVQL

[fkuehne]

Thanks for sharing. I'll check it out as time allows.

[jasin755]

Ok. Thanks!