[vtk-developers] vtkFFMPEGWriter - bitrate and bitrate tolerance

[Dave Partyka]

In the past there were no versions of FFMPEG (until just recently) other
than svn revisions. So we just picked an arbitrary revision that worked on
all of our platforms and stuck with it. Also, we use one of the most basic
and mature codecs (mjpeg) which I don't think has changed much? Anyway, keep
us posted.

On Thu, Jul 29, 2010 at 4:37 PM, Nicolas Rannou <
Nicolas_Rannou at hms.harvard.edu> wrote:

> I think that if the ancient FFMPEG is working with the current VTK git
> master it should still work after.
> I'm currently using the FFMPEG deb package provided with ubuntu 10.04.
>
> I'll fork the VTK git master, commit the changes and let you know as soon
> as it is done then we can give it a try with Paraview.
>
> Is there any reason about using the ancient FFMPEG in Paraview?
>
>     Nicolas
>
> On Jul 29, 2010, at 3:38 PM, Dave Partyka wrote:
>
> 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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