Preserve video color range and handle capture worker failures

tools/chatgui/src/stream_video_encoder.cpp

@@ -2,6 +2,7 @@
 #include "debug_config.h"
 #include <QPainter>
 #include <algorithm>
+#include <cstring>
 extern "C" {
 #include "../../../src/stream/stream_media.h"
 #ifdef HAVE_FFMPEG
@@ -172,11 +173,13 @@ bool StreamVideoEncoder::encode(const QImage& image, uint64_t pts, bool key, QLi
     { QPainter painter(&canvas); painter.drawImage(QRect(QPoint((canvas.width() - fitted.width()) / 2,
         (canvas.height() - fitted.height()) / 2), fitted), image); }
     int result = av_frame_make_writable(m->frame);
-    m->scale = sws_getCachedContext(m->scale, canvas.width(), canvas.height(), AV_PIX_FMT_BGRA,
+    m->scale = sws_getCachedContext(m->scale, canvas.width(), canvas.height(), AV_PIX_FMT_RGB32,
         m->frame->width, m->frame->height, static_cast<AVPixelFormat>(m->frame->format), SWS_FAST_BILINEAR, nullptr, nullptr, nullptr);
     if (!m->scale) result = AVERROR(ENOMEM);
     if (result >= 0) {
-        const uint8_t* input[] = {canvas.constBits()}; int stride[] = {canvas.bytesPerLine()};
+        const int* coefficients = sws_getCoefficients(SWS_CS_ITU709);
+        sws_setColorspaceDetails(m->scale, coefficients, 1, coefficients, 0, 0, 1 << 16, 1 << 16);
+        const uint8_t* input[] = {canvas.constBits()}; int stride[] = {static_cast<int>(canvas.bytesPerLine())};
         result = sws_scale(m->scale, input, stride, 0, canvas.height(), m->frame->data, m->frame->linesize);
     }
     m->frame->pts = static_cast<int64_t>(pts); m->frame->pict_type = key ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_NONE;