When there is no metadata attached to a frame, take into account both
the PQ and HLG transfers, and change the HLG default value to 10:
the value of 12 is the maximum range in scene referred light, but
the reference OOTF maps this from 0 to 1000 cd/m² on the ideal HLG
monitor.
This matches what vf_tonemap_opencl does.
---
libavfilter/vf_tonemap.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/libavfilter/vf_tonemap.c b/libavfilter/vf_tonemap.c
index 10308bdb16..10fd7ea016 100644
--- a/libavfilter/vf_tonemap.c
+++ b/libavfilter/vf_tonemap.c
@@ -131,10 +131,10 @@ static double determine_signal_peak(AVFrame *in)
peak = av_q2d(metadata->max_luminance) / REFERENCE_WHITE;
}
- /* smpte2084 needs the side data above to work correctly
- * if missing, assume that the original transfer was arib-std-b67 */
+ // For untagged source, use peak of 10000 if SMPTE ST.2084
+ // otherwise assume HLG with reference display peak 1000.
if (!peak)
- peak = 12;
+ peak = in->color_trc == AVCOL_TRC_SMPTE2084 ? 100.0f : 10.0f;
return peak;
}
--
2.17.1
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