Fix transitioning into having no HDMI/SDI output (output_card_index=1).

diff --git a/mixer.cpp b/mixer.cpp
index 855a73fcaf5969a63a4f27c8f487cf7273b84151..b5311a32ed574354d9ac24b00246431307edff55 100644 (file)
--- a/mixer.cpp
+++ b/mixer.cpp
@@ -281,18 +281,19 @@ void Mixer::set_output_card(int card_index)
                old_card->is_fake_capture = false;
                old_card->capture->start_bm_capture();
        }
-
-       CaptureCard *card = &cards[card_index];
-       bmusb::CaptureInterface *capture = card->capture.get();
-       lock.unlock();
-       capture->stop_dequeue_thread();
-       lock.lock();
-       card->parked_capture = move(card->capture);
-       bmusb::CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
-       configure_card(card_index, fake_capture, /*is_fake_capture=*/true, card->output.release());
-       card->queue_length_policy.reset(card_index);
-       card->capture->start_bm_capture();
-       card->output->start_output(bmdModeHD720p5994, pts_int);  // FIXME
+       if (card_index != -1) {
+               CaptureCard *card = &cards[card_index];
+               bmusb::CaptureInterface *capture = card->capture.get();
+               lock.unlock();
+               capture->stop_dequeue_thread();
+               lock.lock();
+               card->parked_capture = move(card->capture);
+               bmusb::CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
+               configure_card(card_index, fake_capture, /*is_fake_capture=*/true, card->output.release());
+               card->queue_length_policy.reset(card_index);
+               card->capture->start_bm_capture();
+               card->output->start_output(bmdModeHD720p5994, pts_int);  // FIXME
+       }
        output_card_index = card_index;
 }