Quick Q on GV HQX codec package

[Tafflad]

Seen mention that it is good to use "Grass Valley HQX" as intermediate codec as it is lossless.

Do they actually mean to use the Grass Valley Lossless, which is in the HQX download package .. and not HQX itself ?

[smrpix]

There is no difference in the quality of lossless files (presumably.)

The reason to use HQX or DNxHD or ProRes is to get near lossless i-frame files that are smaller than actual lossless files.

If you are planning to link back to your source files after editing, you don't even need particularly high quality DNxHD, HQX or ProRes.

[jagabo]

Do they actually mean to use the Grass Valley Lossless, which is in the HQX download package .. and not HQX itself ?

HQX is high quality, easily editable, but not lossless. Grass Valley Lossless is lossless (assuming no colorspace conversions), easily editable, but will usually give larger files. Use whichever (or any of the similar low loss or lossless codecs) is suitable for your application.

[Tafflad]

OK .. thnx ...

On my quick test - compared to original file HQX encoded is around 20% smaller

The GV Lossless though is aprox 700% larger ....... I thought Lossless would mean the lossless encoding would be similar to original size ... ? even if I saved as direct stream copy it is only 20% bigger

[jagabo]

Lossless mean lossless from an uncompressed video. Since you are starting with a highly compressed video it must be uncompressed before it can be compressed losslessly. Hence it grows in size.

[Tafflad]

Ta