Video Reader sequence start and end

[Pedrexus]

Describe the question.

Hello all,

The video reader has a sequence_length and stride parameters, but is there any way to identify which part of the video I am getting in a batch? It happens that I have long videos with one label for each frame, and using the get_property functions gives me repeated filepaths per batch, but no way to identify each frame.

Is there a way to retrieve this kind of info with DALI's video reader?

I found this issue using external_source, but it doesn't seem to have a solution.

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[JanuszL]

Hi @Pedrexus,

Thank you for reaching out. Please check the enable_frame_num parameter so you get the frame number of the first frame in the returned sequence. Then you can write custom code to map the number to the label.

[Pedrexus]

Hello @JanuszL,

thank you for the help. I was trying to use the experimental video reader, which does not seem to support it.

I was able to get it working with the regular reader.

[JanuszL]

Yes, indeed this is one of the functionalities that miss the parity compared to the old reader.