[x264-devel] Generating H264 for iPad?

[Andrew Krupiczka]

Not sure what your problem might be.
Can only tell, that I had been able to play 720p video clips encoded at ~8Mbps in the Baseline Profile even on "iPad1".
Perhaps your generated bitstreams are not quite legal or iPad decoder is simply not "sufficiently smart".
What encoding profile are you trying to use?

Regards,

Andrew





-----Original Message-----
From: x264-devel-bounces at videolan.org [mailto:x264-devel-bounces at videolan.org] On Behalf Of Jason Garrett-Glaser
Sent: Tuesday, February 21, 2012 5:49 PM
To: Mailing list for x264 developers
Subject: Re: [x264-devel] Generating H264 for iPad?

On Tue, Feb 21, 2012 at 2:20 PM, Reindl Harald <h.reindl at thelounge.net> wrote:
>
>
> Am 21.02.2012 23:18, schrieb Hadmut Danisch:
>> Hi,
>>
>> I just ran into a particular problem with ffmpeg and H264 encoding, 
>> and was forwarded by package maintainers to this mailing list.
>>
>>
>> I'd like to convert several videos into H264, most of them into 
>> 1280x720, currently testing bitrates between 700k and 2000k. I'd like 
>> to use the generated videos on Computers, network DLNA streamers, and 
>> mobile devices such as iPad.
>>
>> The problem I've ran into:
>>
>> The videos I generate with ffmpeg (e.g. ffmpeg -i sample_in.mp4 
>> -vcodec
>> libx264 -vpre superfast -b 2000k -acodec copy -s 1280x720 -aspect 
>> 16:9
>> sample_out.mp4 ) can be viewed without any problem on computers and 
>> my network streamers, but not on my iPad. The iPad drops frames, 
>> can't generate full screens, completely freezes the screen. This does 
>> not happen if I reduze the resolution. The problem is obviously that 
>> the iPad does not have enough computation power.
>
> you need baseline profile!
>
> iphones are refusing videos with main-profile completly

This is false; Apple has marketed Main Profile support for years and, in reality, iPads actually support High Profile.

Jason
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