[Paraview] compiling ffmpeg for paraview on mac os x

[Michael Wild]

Found the problem! It wasn't with ffmpeg, but the offscreen rendering.  
I remembered reading a post to this list about someone getting black  
screenshots, so I figured I'd give it a try: and voilà, it worked!

I couldn't find a bug-report related to this in mantis, but am not  
sure I used the correct search terms. Is this a known issue or should  
I create a new entry?

Michael


On 26Apr, 2008, at 18:06, Berk Geveci wrote:

> Here if what I used to build ffmpeg:
>
> FFmpeg version SVN-r6375, Copyright (c) 2000-2004 Fabrice Bellard
>  configuration:  --enable-shared --disable-mmx --disable-vhook
>  libavutil version: 49.0.1
>  libavcodec version: 51.16.0
>  libavformat version: 50.5.0
>  built on Mar 30 2007 14:01:41, gcc: 4.0.1 (Apple Computer, Inc.  
> build 5367)
>
> -berk
>
> On Sat, Apr 26, 2008 at 10:40 AM, Michael Wild <themiwi at gmail.com>  
> wrote:
>> Hi all
>>
>>
>> I tried to get ffmpeg to compile the way as described in
>> http://www.vtk.org/files/support/ffmpeg_source.tar.gz for use in  
>> ParaView
>> 3.3.0 CVS. But the instructions are quite stale and the included  
>> source does
>> not compile on intel macs. So I pulled the current HEAD from ffmpeg
>> subversion repository, but found it to be in a state which doesn't  
>> compile.
>> I then extracted the tar.gz provided by fink (versioned  
>> ffmpeg-0.4.20071217)
>> which compiles cleanly. However, there seems to be a change in the  
>> API which
>> required me to remove the & in the expression
>> url_fclose(&this->avFormatContext->pb) of the file
>> VTK/IO/vtkFFMPEGWriter.cxx.
>>
>> Things compiled now, but whenever I try to export a movie, ffmpeg  
>> reports
>> on the command line that "[msmpeg4 @ 0x581c810]bitrate tolerance  
>> too small
>> for bitrate" and ParaView tells me that "vtkFFMPEGWriter  
>> (0x1ce649b0): Error
>> initializing video stream."
>>
>> Ok, but in binary distribution of ParaView-3.2.1 things work, so I  
>> tried to
>> figure out which version of ffmpeg has been used for the creation  
>> of that
>> particular binary. I figured out that the ffmpeg revision used must  
>> be in
>> the range 6350-6639, because otherwise the library versions don't  
>> match. But
>> which of these 290 revisions? I tried some, namely 6350 and 6639,  
>> but both
>> do not compile properly. For the latter I had to hack the configure  
>> script
>> to create a valid config.mak and the common.mak I had to change in  
>> order to
>> prevent the thing trying to link libavutil against itself (quite
>> idiotic...). Finally things failed when the assembler choked on
>> non-relocatable assembly code in libavcodec/cabac.h. Configuring  
>> ffmpeg to
>> create static libraries however worked. But then linking libvtkIO  
>> requires
>> the "-read_only_relocs suppress" flag to be set (which I'm not  
>> quite sure
>> about what it does)...
>>
>> At that point compiling succeeded, and I could even create an avi  
>> movie.
>> However, the output is just black.
>>
>> I hope that someone from the developer team can shed some light on  
>> how to
>> get ffmepg working with paraview on Mac OS X.
>>
>> Michael
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