From: Hans de Goede <hdegoede@redhat.com>
To: Yuri <yuri@rawbw.com>
Cc: linux-media@vger.kernel.org
Subject: Re: Bugreport for libv4l: error out on webcam: error parsing JPEG header: Bogus jpeg format
Date: Tue, 20 Jul 2010 00:46:02 +0200 [thread overview]
Message-ID: <4C44D5AA.8060600@redhat.com> (raw)
In-Reply-To: <4C448311.6090704@rawbw.com>
Hi,
On 07/19/2010 06:53 PM, Yuri wrote:
> On 07/19/2010 05:22, Hans de Goede wrote:
>> This is not really a bug in libv4l, but more of a problem with error
>> tolerance in the application you are using. However many apps don't
>> handle
>> any kind of errors all that well. So the latest libv4l will retry (get
>> a new
>> frame) jpeg decompression errors a number of times.
>
> You are right, application is quite rough and doesn't have any tolerance.
>
> But why such bad bytes appear in the first place? I think they are sent
> by the
> camera deliberately to indicate something and Windows driver must be
> knowing
> what do they mean.
That is not very likely as they are in the middle of the jpeg data stream
(special bytes would normally be in the header or footer of each frame).
Most likely the cause is a not 100% usb connection, or some subtle linux
driver bug causing this.
Regards,
Hans
prev parent reply other threads:[~2010-07-19 22:42 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-15 19:30 Bugreport for libv4l: error out on webcam: error parsing JPEG header: Bogus jpeg format Yuri
2010-07-19 12:22 ` Hans de Goede
2010-07-19 16:53 ` Yuri
2010-07-19 22:46 ` Hans de Goede [this message]
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