GstCollectPads: getting callbacks when a sinkpad's buffer has size 0.

[Lei Miao]

> A zero-sized buffer is a valid buffer, so collectpads considering that
>> as such seems correct. However it seems wrong that you have zero-sized
>> buffers in your pipeline. I would start debugging which element inserts
>> them and why, and then make sure that this doesn't happen.
>>
>>
>
>
Thank you for the response. The information you provided does make sense.
There are only two types of elements in front of our element in the
pipeline: souphttpsrc and queue2. I suspect it's souphttpsrc that inserted
the zero-sized buffer. The problem also seems to be related to the server
that souphttpsrc fetches data from: it hasn't happened since we reported
the issue to the service provider. In order to troubleshoot the issue, I
guess I will have to wait until it happens next time, knock on wood.
However, if anyone has any general comments about how possibly souphttpsrc
inserts such zero-sized buffers, please let me know.

Regards,

LM
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