X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=nageru%2Fmjpeg_encoder.cpp;h=614cb5cc8836a80b3eb4831d91a1465c8cd4a73e;hb=012f5333c8958ed3da410ef53493c347028b44c4;hp=3587d78dcf3fa51a61a92af89ec362b3297b2d3e;hpb=d984b544b27aa35a4fd8d0ddba5c651e2ef21ce2;p=nageru

diff --git a/nageru/mjpeg_encoder.cpp b/nageru/mjpeg_encoder.cpp
index 3587d78..614cb5c 100644
--- a/nageru/mjpeg_encoder.cpp
+++ b/nageru/mjpeg_encoder.cpp
@@ -389,6 +389,10 @@ void MJPEGEncoder::init_jpeg_422(unsigned width, unsigned height, VectorDestinat
 	cinfo->comp_info[2].v_samp_factor = 1;
 	cinfo->CCIR601_sampling = true;  // Seems to be mostly ignored by libjpeg, though.
 	jpeg_start_compress(cinfo, true);
+
+	// This comment marker is private to FFmpeg. It signals limited Y'CbCr range
+	// (and nothing else).
+	jpeg_write_marker(cinfo, JPEG_COM, (const JOCTET *)"CS=ITU601", strlen("CS=ITU601"));
 }
 
 vector<uint8_t> MJPEGEncoder::get_jpeg_header(unsigned width, unsigned height, jpeg_compress_struct *cinfo)