[FFmpeg-devel] ffmpeg for bluefin bug
Adam Dershowitz, Ph.D., P.E.
Thu Mar 19 00:57:16 CET 2009
On Mar 17, 2009, at 4:54 PM, Diego Biurrun wrote:
> On Tue, Mar 17, 2009 at 01:40:36PM -0700, Adam Dershowitz, Ph.D.,
> P.E. wrote:
>> On Mar 17, 2009, at 5:06 AM, Diego Biurrun wrote:
>>> On Mon, Mar 16, 2009 at 02:58:37PM -0700, Adam Dershowitz wrote:
>>>> I was trying to compile ffmpeg 0.5 on the Blackfin, with
>>>> uclinux. I
>>>> found a bug and then a fix.
>>>> I am using --enable-swscale and when it tries to link, I get a link
>>>> libswscale.so undefined reference to
>>>> Sure enough this function is used in libswscale/yuv2rgb.c:
>>>> lines 461:
>>>> #if ARCH_BFIN
>>>> if (c->flags & SWS_CPU_CAPS_BFIN)
>>>> t = sws_ff_bfin_yuv2rgb_get_func_ptr(c);
>>>> But I greped through the code and I can't find that function
>>>> anywhere. In fact, I only see it that single time in the code.
>>>> I asked around some and was told that:
>>>> ff_bfin_yuv2rgb_get_func_ptr in yuv2rgb_bfin.c is the correct
>>>> So one of these needs to be changed so that they have the same
>>>> I am not sure if this is the best place to report this bug and fix.
>>>> If not, please let me know where might be a better place.
>> Thanks....but. Now ti compiles and starts to run on my BF527 EZkit
>> board. I get the normal startup message and I get info on the
>> streams. Before any frames get converted I get an "illegal
>> instruction" and a core dump.
>> Any suggestions about this?
> Gather the relevant information and send us a bug report:
I just registered and tried to. But I keep getting an error when I
click submit that says:
An error has occurred
A problem was encountered processing your request. The tracker
maintainers have been notified of the problem.
Am I doing something wrong, or is something wrong with the tracker?
>> Given the above error it looks like no one has actually tested the
>> blackfin specific code. I had been running a much older version of
>> ffmpeg from blackfin.uclinux.com that does run.
> Marc Hoffman, the author of the blackfin code in FFmpeg, used to work
> for Analog Devices, I'm pretty sure the code must have worked at some
> point on some machine.
I have also been talking to some people at blackfin.uclinux.org. That
site has a few people from AD who post (maybe support the site?). I
have not seen any posting from Hoffman in a while, so might not be
working on this any longer.
But the current release of Linux on that site includes ffmpeg-
svn-11114 and that version does compile and run.
>> But this new one doesn't. I have tried both with and without swscale
>> with the same results.
> Then the bug may be in libavcodec instead of libswscale.
Sounds likely. I have tried a few different input and output file
types, and always get the same results.
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