[aravis] Re: Debugging latency & long pause issues with Blackfly camera...
- From: Patrick Doyle <wpdster@xxxxxxxxx>
- To: aravis@xxxxxxxxxxxxx
- Date: Tue, 15 Apr 2014 12:12:37 -0400
Oh, ok. I assumed that integer nodes were 32 bits.
Can I ask how you obtained the genicam data? I'd like to view the
equivalent data for my camera. I expect the two cameras share the
same genicam back end, so I don't expect I'll learn anything. But who
knows.
--wpd
On Tue, Apr 15, 2014 at 12:09 PM, Emmanuel Pacaud <emmanuel@xxxxxxxxx> wrote:
> Le mardi 15 avril 2014 à 10:17 -0400, Patrick Doyle a écrit :
>> On Tue, Apr 15, 2014 at 9:52 AM, Emmanuel Pacaud <emmanuel@xxxxxxxxx> wrote:
>> > Hi,
>> > The problem with the blackfly camera I own (a BFLY-PGE-14S2C-CS) is the
>> > camera timestamp is wrong. The camera send in the image packet a
>> > timestamp expressed as timing ticks. Aravis then use the content of the
>> > register TimingTickFrequency in order to compute the timestamp in
>> > nanosecond. Unfortunately, TimingTickFrequency register returns a wrong
>> > value, and then the timestamp in nanosecond is also wrong.
>> >
>> I notice in arvgvdevice.c that you read the timestamp tick frequency
>> as 2 32-bit numbers (a high & a low).
>>
>> But I notice that arv-tool-0.4 reports a GevTimestampTickFrequency as
>> a single 32-bit integer for my Blackfly camera (a BFLY-PGE-03S2M-CS).
>> I was going to go investigate this further -- what is it that you do
>> when you call arv_device_read_register() for those two 32-bit
>> registers, and how does that differ from reading the 32-bit integer
>> through whatever interface arv-tool-0.4 uses.
>
> I don't know if you camera model is the same as mine, but in my case
> GevTimestampTickFrequency is actually a 64 bit value, even if the
> maximum value is 4294967295.
>
> Here's the relevant genicam data:
>
> <Integer Name="GevTimestampTickFrequency" NameSpace="Standard">
> <ToolTip>
> Indicates the number of timestamp ticks in 1 second (frequency in Hz).
> </ToolTip>
> <Description>
> Indicates the number of timestamp ticks in 1 second (frequency in Hz).
> </Description>
> <DisplayName>GEV Timestamp Tick Frequency</DisplayName>
> <Visibility>Expert</Visibility>
> <ImposedAccessMode>RO</ImposedAccessMode>
> <pValue>GevTimestampTickFrequencyValue</pValue>
> <Min>0</Min>
> <Max>4294967295</Max>
> <Representation>PureNumber</Representation>
> </Integer>
> <IntSwissKnife Name="GevTimestampTickFrequencyValue">
> <pVariable Name="HIGH">pGevTimestampTickFrequencyHighReg</pVariable>
> <pVariable Name="LOW">pGevTimestampTickFrequencyLowReg</pVariable>
> <Formula>(HIGH << 32) | LOW</Formula>
> </IntSwissKnife>
>
> Integer node is a 64 bit value.
>
> Emmanuel.
>
>
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