FastFlix 4.5.1 Portable (x64)

By | January 4, 2022

FastFlix 4.5.1 Portable (x64) Free Download is an easy and friendly GUI for encoding videos. FastFlix maintains HDR10 metadata for x265, NVEncC HEVC, and VCEEncC HEVC, which will also be extended to AV1 libraries when available. It needs FFmpeg (version 4.3 or greater) beneath the hood for heavy lifting and can work with a variety of encoders.

Overview Of FastFlix 4.5.1 Portable (x64)


On any 10-bit or greater video output, FastFlix will copy the entered HDR colorspace (bt2020). Which is different than HDR10 or HDR10+.


Portable FastFlix Free Download was once created to easily extract / reproduction HDR10 data, which it can do with the above-listed encoders (x265, NVEncC, VCEEncC).

VP9 has a limited assist to copy some present HDR10 metadata, usually from different VP9 files. Will have the line “Mastering Display Metadata, has_primaries:1 has_luminance:1 …” when it works.

AV1 is still in development, and as such none of them presently support putting mastering-display data via FFmpeg (aka not supported with FastFlix), however, some do if you use them directly.

rav1e – can set mastering statistics and CLL via their CLI however not thru FFmpeg.
SVT AV1 – accepts a “–enable-hdr” flag that is not properly documented, not supported thru FFmpeg.
moment (labor-av1) – does not appear to support HDR10


For Windows customers with Nvidia cards, NVEncC is the best alternative currently to use HDR10+.

FastFlix additionally supports the use of generated or extracted JSON HDR10+ Metadata with HEVC encodes via x265. However, that is particularly dependent on an FFmpeg model that has been compiled with x265 that has HDR10+ support. BtbN’s Windows FFmpeg builds have this support as of 10/23/2020 and can also require a manual upgrade.

If you add HDR10+ metadata file, make positive the encoding log does NOT contain the line x265 [warning]: –dhdr10-info disabled. Enable HDR10_PLUS in CMake or else it is unsupported.


FastFlix (v4.0.2+) passes thru HLG color switch information to the whole thing except web and GIF. You Can Also Download Supreme Portable (x64)

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