raspiyuv: request for output Y values only.

[chewep]

Is it possible to output Y values only and discarding U and V values?

[a1k0n]

Well, the good part about the I420 image format that it outputs is that the Y values come first, and then U, and then V, so truncating the file to a size of width*height bytes will do it without messing around with the source.

However it wouldn't be super hard to hack in an option to RaspiStillYUV.c -- inside camera_buffer_callback, you could check pData->pstate->(some option) and then just write something smaller than buffer->length.

[Ruffio]

@chewep is this still an issue?

[Ruffio]

@chewep is this still an issue?

[waveform80]

Not even necessary to hack raspiyuv for this - simply pipe the output through the standard head command to chop off the UV tail and you should be good to go. Just calculate the number of bytes you need (bearing in mind the camera rounding horizontal resolution up to 32, and the vertical up to 16).

For example, with a V1 camera module capturing at 2592x1944 the amount of data output by raspiyuv will be 2592 * 1952 * 1.5 (1952 because of the vertical rounding, 1.5 because YUV420 format includes Y values at full resolution and U and V values at quarter resolution each). We only want the first 2592 * 1952 = 5059584 bytes of information, which the following command line should achieve:

$ raspiyuv -o - | head -c $((2592*1952)) > output.yuv

Just adjust the -c value according to your resolution and you should be good to go.

[6by9]

You can use head, but that won't work for timelapse sensibly.

Boredom, so just making up a PR. raspividyuv also appears to be missing support for RGB mode, so stuffing that in at the same time.

[6by9]

Patches pushed to my tree, but totally untested beyond "they build", so need to do that before creating a PR.