diff --git a/selfdrive/test/process_replay/regen.py b/selfdrive/test/process_replay/regen.py
index 4d00613f0a..273659c9ff 100755
--- a/selfdrive/test/process_replay/regen.py
+++ b/selfdrive/test/process_replay/regen.py
@@ -23,7 +23,7 @@ class DummyFrameReader(BaseFrameReader):
     self.frame_count = frame_count
     self.frame_type = FrameType.raw
 
-  def get(self, idx, count=1, pix_fmt="yuv420p"):
+  def get(self, idx, count=1, pix_fmt="rgb24"):
     if pix_fmt == "rgb24":
       shape = (self.h, self.w, 3)
     elif pix_fmt == "nv12" or pix_fmt == "yuv420p":
diff --git a/tools/lib/framereader.py b/tools/lib/framereader.py
index 275b9b65b8..0eddc88868 100644
--- a/tools/lib/framereader.py
+++ b/tools/lib/framereader.py
@@ -209,7 +209,7 @@ class BaseFrameReader:
   def close(self):
     pass
 
-  def get(self, num, count=1, pix_fmt="yuv420p"):
+  def get(self, num, count=1, pix_fmt="rgb24"):
     raise NotImplementedError
 
 
@@ -497,7 +497,7 @@ class GOPFrameReader(BaseFrameReader):
 
       return self.frame_cache[(num, pix_fmt)]
 
-  def get(self, num, count=1, pix_fmt="yuv420p"):
+  def get(self, num, count=1, pix_fmt="rgb24"):
     assert self.frame_count is not None
 
     if num + count > self.frame_count:
@@ -523,12 +523,12 @@ class StreamFrameReader(StreamGOPReader, GOPFrameReader):
     GOPFrameReader.__init__(self, readahead, readbehind)
 
 
-def GOPFrameIterator(gop_reader, pix_fmt):
+def GOPFrameIterator(gop_reader, pix_fmt='rgb24'):
   dec = VideoStreamDecompressor(gop_reader.fn, gop_reader.vid_fmt, gop_reader.w, gop_reader.h, pix_fmt)
   yield from dec.read()
 
 
-def FrameIterator(fn, pix_fmt, **kwargs):
+def FrameIterator(fn, pix_fmt='rgb24', **kwargs):
   fr = FrameReader(fn, **kwargs)
   if isinstance(fr, GOPReader):
     yield from GOPFrameIterator(fr, pix_fmt)