Video writing, which codec/format for smallest file size

[Amina Kinkhabwala]

Hi there,

I'm using VideoWriter to write a tiny video (resized to 190 x 300 pixels in size) but it ends up still being quite large. I've tried writing to .avi with FMP4 and DIB but both are writing fairly large files. Am I missing something on how to downsize my video? 

[Gonçalo Lopes]

Hi Amina,

Is the video color or grayscale? You can try compressing with DIVX instead of FMP4, it might give smaller files.

Otherwise, you probably need to control the exact compression parameters. For that you would need to use FFmpeg pipes. There are some examples of this in the forum:

ImageWriter and ffmpeg for file size reduction (google.com)

and also one in the gallery now in Tools > Bonsai Gallery > FFmpeg Writer Example.

Also some cool tips here for GPU encoding: GitHub - ThomasAkam/Point_Grey_Bonsai_multi_camera_acquisition: Configurable acquisition from multiple FLIR/Point Grey camera using Bonsai and Python to h264 compress the video on the GPU.

Hope this helps,

On Tue, 8 Jun 2021 at 20:54, Amina Kinkhabwala <amina.ki...@gmail.com> wrote:

Hi there,

I'm using VideoWriter to write a tiny video (resized to 190 x 300 pixels in size) but it ends up still being quite large. I've tried writing to .avi with FMP4 and DIB but both are writing fairly large files. Am I missing something on how to downsize my video? 

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