e4373454ba
HDR (HDR10/HLG/Dolby Vision) transcoded to SDR came out washed-out and desaturated because the filter chain never tonemapped. buildHLSFFmpegArgsAt now inserts a zscale linearise -> hable tonemap -> BT.709 chain after the scale and before format=, but only when the source is HDR and the ffmpeg build has zscale (FFmpegSupportsZscale, cached). Builds without zimg keep the old behaviour (plays, just desaturated) instead of erroring. It's a CPU filter, valid for every encoder here: the decode hwaccel deliberately leaves frames in system memory (no -hwaccel_output_format), so zscale runs ahead of format=/hwupload exactly like the existing scale filter. Verified on a real 4K HDR10 file — vivid colour and deep blacks vs the washed-out baseline. |
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