How to use DCMI JPEG mode correctly?

How to know about the end of the transfer frame?

How do I know how many bytes were received?

Why are the HAL_DCMI_LineEventCallback and HAL_DCMI_VsyncEventCallback events triggered after HAL_DMA_Abort was called?

They also continue to be called after a single call to DCMI_MODE_SNAPSHOT

After a single call HAL_DCMI_Start_DMA and events HAL_DCMI_LineEventCallback and HAL_DCMI_VsyncEventCallback never stop, is this normal?

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