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Does PLEX support H/W Acceleration for transconding?

1080p transcoding

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#1 neat

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Posted 17 September 2013 - 05:09 PM

Hello.

 

I am a Asustor AS-302T  user and I know AS-302T has an Intel Atom CE5335 CPU with enhanced H/W support for transcoding.

Also I was told that CE5300 series could transcode 1080p on the fly.

 

Does Plex transcode 1080p with this H/W acceleration?

 

Thanks.

 

 



#2 Tobias Hieta

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Posted 18 September 2013 - 08:57 AM

No.


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#3 neat

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Posted 19 September 2013 - 06:55 AM

Then, is there any plan for it?

 

As I know, Not only just Asustor, but also Synology, Thecus have new NAS line ups with Atom CE5300 series .

 

I wish Plex support H/W Acceleration for transcoding someday.

 

Thanks. 



#4 Tobias Hieta

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Posted 19 September 2013 - 08:33 AM

Let's just say that it's not that easy. First the support has to hit FFMPEG and then we have to make some kind of detection and then it actually needs to help us. So it's a long road, but we are definitely keeping our eyes open for it.


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#5 braaam

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Posted 23 September 2013 - 01:19 AM

This review mentions succesful 1080p transcoding with the AS-302T

 

Using the Plex app I was able to quickly and smoothly transcode 1080p video to my iPad.  Although achievable on previous Atom Powered nas enclosures, the new chip made it noticeably faster and smoother.  To further test it I also started streaming to my iPhone.  This is where the chip shines and it handle multiple streams being transcoded simultaneously with ease.



#6 Tobias Hieta

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Posted 23 September 2013 - 04:31 AM

Yeah it should probably work fine on low bitrate stuff.

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#7 braaam

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Posted 25 September 2013 - 09:07 PM

Yeah it should probably work fine on low bitrate stuff.

 

I can definitely confirm that the AS-302T is currently NOT capable of realtime transcoding high resolution material with PLEX. Tried to play the file below on my iPhone 4s on a local network and transcoding was about half speed.

 

MEDIA

  • Video Resolution 1080p
  • Duration 43:01
  • Bitrate 8140 kbps
  • Width 1920
  • Height 1080
  • Aspect Ratio 1.78
  • Container MKV
  • Video Frame Rate NTSC
FILE
  • Accessible Yes
  • Exists Yes
  • Duration 43:01
  • File ****
  • Size 2.45 GB
  • Container MKV
VIDEO
  • Codec H264
  • Bitrate 7500 kbps
  • Language English
  • Bit Depth 8
  • CABAC 1
  • Chroma Subsampling 4:2:0
  • Color Space yuv
  • Duration 43:01
  • Frame Rate 29.970 fps
  • Frame Rate Mode cfr
  • Has Scaling Matrix 0
  • Height 1080
  • Level 4.0
  • Profile high
  • Ref Frames 4
  • Scan Type progressive
  • Width 1920
AUDIO
  • Codec AC3
  • Channels 5.1
  • Bitrate 640 kbps
  • Bit Depth 16
  • Bitrate Mode CBR
  • Dialog Norm -27 dB
  • Duration 43:01
  • Sampling Rate 48000 Hz


#8 norse

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Posted 26 September 2013 - 07:21 AM

What about a standard 720p movie? Would you be kind to try that out? Looking to buy in to the 6-series asustor if it can handle it. Thanks :)



#9 Tobias Hieta

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Posted 26 September 2013 - 08:06 AM

What about a standard 720p movie? Would you be kind to try that out? Looking to buy in to the 6-series asustor if it can handle it. Thanks :)

 

It's a atom processor, so it should handle 720p with some marginal, low bitrate 1080p should also be fine. but when you go over ~5mbps you might be screwed :)


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#10 braaam

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Posted 26 September 2013 - 09:02 AM

What about a standard 720p movie? Would you be kind to try that out? Looking to buy in to the 6-series asustor if it can handle it. Thanks :)

 

I'll do some more testing tonight, will let you know the outcome here. 



#11 braaam

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Posted 26 September 2013 - 08:19 PM

Tested a 720p file:

  • original settings: 3047kbps@720p
  • target settings on iphone: 4mbit@720p

With the universal transcoder on it does hiccup at these settings (all 4 cores are used at max). With the universal transcoder off it doesn't break a sweat (hardly any cpu use).

 

Can anyone explain why there's such a big difference there?



#12 norse

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Posted 27 September 2013 - 05:27 AM

Thanks for testing!

 

My Samsung TV(for example) support 99% of my mkvs by default. That means I do not have to transcode anything to get it working, and I can stream 1080p as long as my internet is fast enough. My iPhone do not support mkvs by default and need them transcoded by the server to a format that the iPhone can view, this does take a lot of processing power and it will be up to the server if it is strong enough.



#13 Tobias Hieta

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Posted 27 September 2013 - 06:00 AM

Tested a 720p file:

  • original settings: 3047kbps@720p
  • target settings on iphone: 4mbit@720p
With the universal transcoder on it does hiccup at these settings (all 4 cores are used at max). With the universal transcoder off it doesn't break a sweat (hardly any cpu use).

Can anyone explain why there's such a big difference there?


Sounds like they made different decisions on how to handle the file. If you shutdown PMS, start it, play with both transcoders in a row and then send me the log I can tell you why.

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#14 braaam

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Posted 30 September 2013 - 04:52 PM

Sounds like they made different decisions on how to handle the file. If you shutdown PMS, start it, play with both transcoders in a row and then send me the log I can tell you why.

 

Tobias, thanks for looking into this: attached are the seperate logs. 'universal' has the universal transcoder option turned on.

 

I did some more testing today with another 720p MKV, it didn't fare well with both transcoding options. It transcoded the video at around 70% of the playback speed on my iphone 4s. Below is the media info from plex: 

 

MEDIA

Video Resolution 720p
Duration 47:14
Bitrate 4440 kbps
Width 1280
Height 720
Aspect Ratio 1.78
Container MKV
Video Frame Rate 24p
FILE
Accessible Yes
Exists Yes
Duration 47:14
File ----
Size 1.46 GB
Container MKV
VIDEO
Codec H264
Bitrate 3968 kbps
Language English
Bit Depth 8
CABAC 0
Chroma Subsampling 4:2:0
Color Space yuv
Duration 47:14
Frame Rate 23.976 fps
Frame Rate Mode cfr
Has Scaling Matrix 1
Height 720
Level 3.1
Profile high
Ref Frames 2
Scan Type progressive
Width 1280
AUDIO
Codec AC3
Channels 5.1
Bitrate 384 kbps
Language English
Bit Depth 16
Bitrate Mode CBR
Dialog Norm -27 dB
Duration 47:14
Sampling Rate 48000 Hz
SUBTITLES
Format SRT

Attached Files



#15 elysiumcore

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Posted 04 February 2014 - 01:27 PM

On the Asustor 602t I was able to play 2 streams from the nas to my ipad air and macbook pro at the same time. At these settings, the cpu monitor shows spikes near 100% while memory is almost full. I am thinking of buying the extra 2 gigs of ram, I don't think i will be decoding more than 2 streams, but this Nas rocks! 

 

  • Video Resolution 1080p

    Duration 2:19:08

    Bitrate 13211 kbps

    Width 1920

    Height 800

    Aspect Ratio 2.35

    Container MKV

    Video Frame Rate 24p







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