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Render to iPad and Android tablets

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andrew donaldsonRender to iPad and Android tablets
by on Mar 29, 2012 at 9:38:27 am

Hi guys,

Firstly apologies if this isn't exactly the correct forum but i know you guys know your stuff!

Im making animations for a monthly magazine available on iPad and Android tablets. Here's my current workflow:
I create in AE, render out Lossless, encode in Handbrake to the settings below:

Frame size: 768 x 1004
Codec: MPEG-4 (FFmpeg)
25 fps
Bit rate: 6500 kbps
2-pass average bitrate
file extension: .mp4

Audio:
Codec: AAC (CoreAudio)
Stereo
Bitrate: 160 kbps

These work well on both iPads and Androids tabs we have here, but we've been getting feedback about them not playing so well in the field (pretty lame actually).

I have read heaps of tech specs from Apple and android websites, but there's no real clear answer to be had.

What I was hoping for here is that someone reading this compresses videos for both iPad and Android tablets and would like to share their workflow.

Thanks in advance guys!
Andrew.

ps, i know that a bitrate of 6.5 Mbps might sound high, but it's worked well here.

Mac OSX, AE CS5, Handbrake Version 0.9.5, etc...


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Mike SmithRe: Render to iPad and Android tablets
by on Mar 29, 2012 at 10:08:23 am

What data rate do you think your customers / those you want to support can reasonably expect to achieve, on e.g. 3G connections .... ? Your 6.5 Mb/s seems highly optimistic. "an effective throughput of 1 to 4 Mbps on many networks on an iPad" is from http://www.macworld.com/article/1151168/250mb_ipad_plan_management.html


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andrew donaldsonRe: Render to iPad and Android tablets
by on Mar 29, 2012 at 10:20:58 am

Hey Mike, thanks for your reply.

Most of our video content is downloaded with the app. So the network speed wouldn't have an effect on the playback speed.

funnily enough the videos in the magazine that do stream, playback just fine!

Thanks for the link, I'll go have a read now...


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Juan ManuelRe: Render to iPad and Android tablets
by on Mar 29, 2012 at 2:06:46 pm

Are you sure the processors in the original Ipad and lower end Android tablets can deal with such a rather high bitrate? With those dimensions, you could use half the bitrate and still get a good enough result. And it will also reduce the data consumption for customers with a cap. BTW, why those dimensions? It's not quite 4:3, which is the Ipad's aspect ratio and would display stretched (thus also straining lower end processors) or with black bars in Android tablets.


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andrew donaldsonRe: Render to iPad and Android tablets
by on Mar 29, 2012 at 2:53:14 pm

Hi Juan, thanks for your reply,

We use the original iPad to do most of our testing so i don't think it can be that.
the animations are usually only a few seconds long (10s max usually), and the video has to be as sharp as the text articles as possible, hence the high bit rate. since its only a few seconds most render out at 5Mb or so, so the magazine aint too big really.

The frame size was given to me by the designers who make all the rest of the content. To be honest ive never really questioned it! its looks good when we play it, so i haven't really needed to test other frame sizes (except full HD, but that would make even bigger files).

Thanks for your reply. Still no real answer to why they don't play well on some peoples devices.


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Darby EdelenRe: Render to iPad and Android tablets
by on Mar 29, 2012 at 6:36:19 pm

That bitrate should not be a problem. However, some older or low end android tablets may not be able to handle high or even main profile MPEG-4/AVC.

The best way I've found to ensure compatibility is to encode with the baseline profile. You can still use level 5.1 for 1080p content.

Darby Edelen


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andrew donaldsonRe: Render to iPad and Android tablets
by on Mar 31, 2012 at 1:16:08 pm

Hi Darby,

Baseline profile is a feature of H264 encoding, which doesn't seem to be supported by alot of Android tablets (crazy i know), which is why we are using FFmpeg as a blanket solution for all OS's.

The powers at be now tell me it an Operating System problem, and its nothing to do with our encoding.
It still leaves me a bit peeved when customers complain about our videos messing everything up.

Thanks for all the replies!


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Darby EdelenRe: Render to iPad and Android tablets
by on Apr 1, 2012 at 12:42:27 am

[andrew donaldson] "Baseline profile is a feature of H264 encoding, which doesn't seem to be supported by alot of Android tablets (crazy i know), which is why we are using FFmpeg as a blanket solution for all OS's."

Ah, I hadn't considered that.

I've only encoded video for playback specifically on Tegra devices, but I can definitely say that H.264 baseline profile works beautifully in that case.

Are there specific tablets you're having trouble supporting?

Darby Edelen


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