[FFmpeg-user] No accelerated colorspace conversion found from yuv422p to rgb24

[Ronny Bismark]

Sorry I forgot to mention the mjpeg compression is needed because of USB
Bandwidth limitations. I use HD resolution (1920x1080)

2012/12/19 Ronny Bismark <tum.bismark at gmail.com>

>
>
> 2012/12/19 Roger Pack <rogerdpack2 at gmail.com>
>
>> On 12/19/12, Ronny Bismark <tum.bismark at gmail.com> wrote:
>> > I used *$sudo make install* to compile (and it went trough) but no
>> change
>> > in the warning.
>> > I'm not using a command line to use the camera. I use the usb_cam
>> package
>> > from ROS. I asked the same question in the ROS and OpenCV forum and they
>> > said it's most likley a ffmpeg issue, which covers the most stuff I
>> could
>> > find on the web.
>> >
>> > *here is the function in the usb_cam.cpp which takes probably care about
>> > the conversion:*
>>
>> I don't see what your'e trying to do overall here...you're using the
>> "hardware acceleration" to get mjpeg images, but then you're
>> converting them?  Does this give you a higher fps rate or something?
>>
>> Your hypothesis is that the warning message "No accelerated colorspace
>> conversion found" is what's causing your extra latency?  Is it using
>> 100% cpu?
>> You may want to try removing all traces of ffmpeg (libav*) from your
>> system and rebuilding...
>> -r
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>>
>
>
> I just want to use the hardware enabled mjpeg compression of my webcam. So
> mjpeg compressed data comes from the cam but the decoder (which I need for
> further processing) doesn't seem to work. the CPU goes up to 100%
> (Pandaboard with ARM-Processor 1.2GHz dual core) so I hope the accelerated
> colorspace conversion (what is it directly?? hardware or software) will
> boost up framerate respectively eliminate the lag.
>
> I already installed ffmpeg 3 times ( ffmpeg-0.10.6, ffmpeg-0.6.2 &
> ffmpeg-0.6.6 ) without changes.
>
> it seems to be a known problem but I still couldn't find a proper solution
> for my system.
> References:
> Bug report #143
> https://ffmpeg.org/trac/ffmpeg/ticket/143?cversion=0&cnum_hist=12
> Bug report #1246
> https://code.ros.org/trac/opencv/ticket/1246
> Bug report
> http://avcodec.org/pipermail/ffmpeg-trac/2011-September/001973.html
> Stackoverflow post
>
> http://stackoverflow.com/questions/6357121/error-no-accelerated-colorspace-conversion-found-vision-opencv-stack-in-ros
>
>
> Would be great to get your thoughts about how to solve this problem.
>
>