[FFmpeg-devel] [HOWTO] Building FFmpeg for iPhone

[Måns Rullgård]

Mahmut Akcay <mahakcay at gmail.com> writes:

> 2009/10/3 M?ns Rullg?rd <mans at mansr.com>
>
>> Mahmut Akcay <mahakcay at gmail.com> writes:
>>
>> >> Does it work with the recommended configure line for 3GS?  What if you
>> >> use --cpu=arm926ej-s?
>> >>
>> > I've just tried --cpu=cortex-a8 on 3GS. Yes, it does the decoding
>> > properly:) It seems that the problem happens when using
>> > --cpu=arm926ej-s on both 3G and 3GS.
>>
>> Thanks, that narrows it down.  Now, can you please edit dsputil_arm.c
>> and comment out lines assigning values to c->put_pixels_tab until it
>> starts working or none remain?  When you have found the minimal number
>> of functions to disable, tell me the result.
>>
>>
> I've commented out both c->put_pixels_tab and  c->put_no_rnd_pixels_tab but
> nothing changed.

All 16 of them?

> I've tried to turn off the arm optimizations, below my findings:
> 1- Using "--disable-armv6 --disable-armvfp" -> Doesn't decode properly
> 2- Using "--disable-armv6 --disable-armvfp --disable-armv5te" -> Decodes
> properly

This suggests a problem with some code enabled for v5TE and above.
Try disabling such code, e.g. idct, and see what happens.

-- 
M?ns Rullg?rd
mans at mansr.com