'Error decompressing JPEG' in mplayer
Till Bayer
I have the Medion cam 0c45:624e. It has worked before with older
versions of the driver, but I could not set the gain correctly with
those. That works with the current version (from today), but running
mplayer as described on the how to page, I still get a distorted picture
and a string of errors of this type:
ibv4lconvert: Error decompressing JPEG: fill_nbits error: need 4 more bits
This has been mentioned several times on this list already, but I'm
still not sure how to fix it.
Cheers,
Till
GWater
> Lets make microdia webcams plug'n play, (currently plug'n pray)
> To post to this group, send email to micr...@googlegroups.com
> Visit us online https://groups.google.com/group/microdia
> -~----------~----~----~----~------~----~------~--~---
>
Hi Till,
Vasily mentioned that libv4l can drop the broken JPEG frames.
Do you have a patch for that, Vasily? Any chance this patch gets into
libv4l?
GWater
Vasily Khoruzhick
> Hi Till,
>
> Vasily mentioned that libv4l can drop the broken JPEG frames.
>
> Do you have a patch for that, Vasily? Any chance this patch gets into
> libv4l?
>
> GWater
Mmm, can't remember that I mentioned anything about jpeg+libv4l+broken
frames :)
Till Bayer
Why are there broken frames in the first place? I get about 20 of these
errors per second...
Till
Brian Johnson
that get an error during the decode step. This is in fact already
being done for the pixart jpeg format. I've attached a patch whcih
should be applied to the latest version of libv4l which will also try
broken frames for the sn9c20x driver. Please test it and let me know
if this fixes the flickering issues.
Till Bayer
> Yes its fairly straight forward to patch libv4l to drop jpeg frames
> that get an error during the decode step. This is in fact already
> being done for the pixart jpeg format. I've attached a patch whcih
> should be applied to the latest version of libv4l which will also try
> broken frames for the sn9c20x driver. Please test it and let me know
> if this fixes the flickering issues.
>
>
it does fix it here. Thanks!
Till
GWater
> Lets make microdia webcams plug'n play, (currently plug'n pray)
> To post to this group, send email to micr...@googlegroups.com
> Visit us online https://groups.google.com/group/microdia
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>
>
I finally got to test this patch.
1. The image is good, no bad frames are shon.
2. The error messages are still there. They are a bit annoying but I'm
not sure if we should suppress them. What do you think?
GWater
Brian Johnson
image isn't flickering. I basiclly just left the behavior when
dropping frames alone and just made it do that for our driver as well
ias when using the pixart jpef format.
GWater
> Lets make microdia webcams plug'n play, (currently plug'n pray)
> To post to this group, send email to micr...@googlegroups.com
> Visit us online https://groups.google.com/group/microdia
> -~----------~----~----~----~------~----~------~--~---
>
OK,
then please submit this to libv4l - a lot of USB1 users will be happy.
GWater