Trace encoder responses to explicit random access frame requests

tools/chatgui/src/stream_video_encoder.cpp

@@ -204,6 +204,8 @@ bool StreamVideoEncoder::encode(const QImage& image, uint64_t pts, bool key, QLi
         }
         StreamEncodedFrame encoded; encoded.key = (packet->flags & AV_PKT_FLAG_KEY) != 0;
         encoded.pts = packet->pts >= 0 ? static_cast<uint64_t>(packet->pts) : pts;
+        if (key) DEBUG_DEBUG(DEBUG_CATEGORY_VIDEO, "desktop requested KEY name=%s input_PTS=%llu output_PTS=%llu key=%d flags=%x bytes=%d",
+            qPrintable(m->name), (unsigned long long)pts, (unsigned long long)encoded.pts, encoded.key, packet->flags, packet->size);
         if (encoded.key) {
             const uint8_t* config = m->filter ? m->filter->par_out->extradata : m->codec->extradata;
             int length = m->filter ? m->filter->par_out->extradata_size : m->codec->extradata_size;
@@ -216,7 +218,11 @@ bool StreamVideoEncoder::encode(const QImage& image, uint64_t pts, bool key, QLi
         output.push_back(std::move(encoded)); av_packet_unref(packet);
     }
     av_packet_free(&packet);
-    if (result == AVERROR(EAGAIN) || result == AVERROR_EOF) return true;
+    if (result == AVERROR(EAGAIN) || result == AVERROR_EOF) {
+        if (key && output.isEmpty()) DEBUG_DEBUG(DEBUG_CATEGORY_VIDEO, "desktop requested KEY buffered name=%s PTS=%llu",
+            qPrintable(m->name), (unsigned long long)pts);
+        return true;
+    }
     if (result < 0) { m->error = ffError(result); DEBUG_ERROR(DEBUG_CATEGORY_VIDEO, "desktop encode failed name=%s PTS=%llu: %s",
         qPrintable(m->name), (unsigned long long)pts, qPrintable(m->error)); return false; }
     return true;