Well I do not like y4m much.
To seek one has to index. To cut one has to use tools. To rewrite a part one has to rewrite the whole file. I mean it is combining the downsides of a variable size format with being uncompressed.
I can see why some prefer it over raw YUV though.
Me and my friends put resolution, frame rate, chroma format and bit depth in the file name.
Can be something simple like foreman_cif.yuv or something more verbose like XXX_HD_u10_lsb16_420p_1920x1080.yuv.
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