[FFmpeg-user] ffmpeg makes some sources darker

[Jim Worrall]

> Yes, that's probably it.
> 
> Maybe you could try below to see if the original shows 709 -
> 
> ffmpeg -analyzeduration 100M -probesize 100M -i original.m2ts
> 
> FWIW I just noticed another issue - using pass 1 and pass 2 via ffmpeg doesn't work for libx265.
> 
> It does work if you use it via -x265-params pass=

No, the original m2ts with the analyze/probe options gives
    Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc

So is it possible to use the -colormatrix and other color options 
as input options?  Is that what I should be doing?  Incidentally, 
those don’t seem to be in the documentation at all.

pass has been working for me - maybe they fixed that in x265 v. 1.8?