X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=futatabi%2Fvideo_stream.cpp;h=87e843ae1e8d61ea7bdd8ae5e9c6822fe304e22b;hb=5c1bc79d6c26c96cb8d2195ae8ef457c30ed364a;hp=8f11714fb6d50bf863e37b9d5b531bbe0fbebe73;hpb=eeda8995329601f9f4e35047358400833eeae68e;p=nageru

diff --git a/futatabi/video_stream.cpp b/futatabi/video_stream.cpp
index 8f11714..87e843a 100644
--- a/futatabi/video_stream.cpp
+++ b/futatabi/video_stream.cpp
@@ -107,6 +107,10 @@ vector<uint8_t> encode_jpeg(const uint8_t *y_data, const uint8_t *cb_data, const
 	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"));
+
 	JSAMPROW yptr[8], cbptr[8], crptr[8];
 	JSAMPARRAY data[3] = { yptr, cbptr, crptr };
 	for (unsigned y = 0; y < height; y += 8) {
@@ -234,7 +238,12 @@ VideoStream::~VideoStream() {}
 void VideoStream::start()
 {
 	AVFormatContext *avctx = avformat_alloc_context();
-	avctx->oformat = av_guess_format("nut", nullptr, nullptr);
+
+	// We use Matroska, because it's pretty much the only mux where FFmpeg
+	// allows writing chroma location to override JFIF's default center placement.
+	// (Note that at the time of writing, however, FFmpeg does not correctly
+	// _read_ this information!)
+	avctx->oformat = av_guess_format("matroska", nullptr, nullptr);
 
 	uint8_t *buf = (uint8_t *)av_malloc(MUX_BUFFER_SIZE);
 	avctx->pb = avio_alloc_context(buf, MUX_BUFFER_SIZE, 1, this, nullptr, nullptr, nullptr);
@@ -438,7 +447,7 @@ void VideoStream::schedule_interpolated_frame(steady_clock::time_point local_pts
 		shared_ptr<Frame> frame2 = decode_jpeg_with_cache(secondary_frame, DECODE_IF_NOT_IN_CACHE, &frame_reader, &did_decode);
 
 		// Then fade against it, putting it into the fade Y' and CbCr textures.
-		ycbcr_semiplanar_converter->prepare_chain_for_fade_from_texture(qf.output_tex, frame2, fade_alpha)->render_to_fbo(resources->fade_fbo, 1280, 720);
+		ycbcr_semiplanar_converter->prepare_chain_for_fade_from_texture(qf.output_tex, 1280, 720, frame2, fade_alpha)->render_to_fbo(resources->fade_fbo, 1280, 720);
 
 		// Subsample and split Cb/Cr.
 		chroma_subsampler->subsample_chroma(resources->fade_cbcr_output_tex, 1280, 720, resources->cb_tex, resources->cr_tex);