Initial rate allocation should not use fps = 0

webrtc/modules/video_coding/video_sender.cc

Index: webrtc/modules/video_coding/video_sender.cc
diff --git a/webrtc/modules/video_coding/video_sender.cc b/webrtc/modules/video_coding/video_sender.cc
index c202d34e859819dabad29201dba1bef82b46d28d..b95d402323aa13aa6280b7534a54a5a732681127 100644
--- a/webrtc/modules/video_coding/video_sender.cc
+++ b/webrtc/modules/video_coding/video_sender.cc
@@ -33,11 +33,12 @@ VideoSender::VideoSender(Clock* clock,
     : clock_(clock),
       _encoder(nullptr),
       _mediaOpt(clock_),
+      has_received_frame_(false),
       _encodedFrameCallback(post_encode_callback, &_mediaOpt),
       send_stats_callback_(send_stats_callback),
       _codecDataBase(&_encodedFrameCallback),
       frame_dropper_enabled_(true),
-      _sendStatsTimer(1000, clock_),
+      _sendStatsTimer(VCMProcessTimer::kDefaultProcessIntervalMs, clock_),
       current_codec_(),
       encoder_params_({BitrateAllocation(), 0, 0, 0}),
       encoder_has_internal_source_(false),
@@ -139,6 +140,7 @@ int32_t VideoSender::RegisterSendCodec(const VideoCodec* sendCodec,
                             sendCodec->startBitrate * 1000, sendCodec->width,
                             sendCodec->height, sendCodec->maxFramerate,
                             numLayers, maxPayloadSize);
+  has_received_frame_ = false;
   return VCM_OK;
 }
 
@@ -199,6 +201,12 @@ EncoderParameters VideoSender::UpdateEncoderParameters(
   uint32_t video_target_rate_bps = _mediaOpt.SetTargetRates(
       target_bitrate_bps, params.loss_rate, params.rtt);
   uint32_t input_frame_rate = _mediaOpt.InputFrameRate();
+  if (input_frame_rate > 0) {
+    has_received_frame_ = true;
+  } else if (input_frame_rate == 0 && !has_received_frame_) {
+    input_frame_rate = current_codec_.maxFramerate;
+  }
+
   BitrateAllocation bitrate_allocation;
   if (bitrate_allocator) {
     bitrate_allocation = bitrate_allocator->GetAllocation(video_target_rate_bps,