activation() error for video classification.

Question

Ramesh M 2021-3-21

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https://ww2.mathworks.cn/matlabcentral/answers/779312-activation-error-for-video-classification

回答： Harshavardhan 2025-5-29

Check for incorrect argument data type or missing argument in call to function 'activations'.

Error in LSTMClass (line 38)

sequences{i,1} = activations(netCNN,'somfile.avi',layerName,'OutputAs','rows');

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Answer 1

Harshavardhan 2025-5-29

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https://ww2.mathworks.cn/matlabcentral/answers/779312-activation-error-for-video-classification#answer_1565599

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Hi @Ramesh M

The error occurs because the “activations” function expects image data, such as 4-D arrays or an image datastore. To fix the error, the video frames need to be read and pre-processed first.

% Read video frames
v = VideoReader(‘somefile.avi’);
frames = {};
while hasFrame(v)
    img = readFrame(v);
    frames{end+1} = img;
end
% Convert frames to 4D array
inputImages = cat(4, frames{:}); % [height, width, channels, numFrames]
% Extract features for all frames
features = activations(netCNN, inputImages, layerName, 'OutputAs', 'rows');