[vtk-developers] vtkFFMPEGWriter - bitrate and bitrate tolerance

[Dave Partyka]

I don't have any objections but would like to know if that change is
compatible with the ancient FFMPEG we typically release ParaView with.

http://www.vtk.org/files/support/ffmpeg_source.tar.gz


On Thu, Jul 29, 2010 at 3:21 PM, Nicolas Rannou <
nicolas_rannou at hms.harvard.edu> wrote:

> Hi all,
>
> We are experimenting issues regarding the usage of vtkFFMPEGWriter.cxx.
> It occurs at least on Mac and Ubuntu 10.04.
> You can reproduce the error turning VTK_USE_FFMPEG ON and running the
> associated test. (ctest -R FFMPEG)
>
> ERROR:
> [mjpeg @ 0x2db2f30]bitrate tolerance too small for bitrate
> Generic Warning: In /home/nr52/GITROOT/VTK/IO/vtkFFMPEGWriter.cxx, line 197
> Could not open codec.
>
> The problem is located at /VTK/IO/vtkFFMPEGWriter.cxx:179, where the
> bit_rate_tolerance is defined as:
> c->bit_rate_tolerance = c->bit_rate/this->FrameRate;
>
> Then, this error ("bitrate tolerance too small for bit-rate") can easily be
> solved decreasing the FrameRate.
>
> Moreover, there is no convenient method to set the bit-rate.
> So far, can only choose between 3 predefined bit-rates, which is quite
> restrictive.
>
> So here is my question: Is there any reason for not creating variables
> BitRate and BitRateTolerance?
> If there is no objection, I can take care of it.
>
> Thanks
>
>
>    Nicolas
>
>
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