If a file explicitly says openh264 , it was likely encoded for speed, not quality. You should look for x264 or DTS-HD tags instead. If you are stuck on the OpenH264 download screen and just want to watch Tyrion prepare for the Battle of the Blackwater, do this:
Download VLC Media Player (Windows/Mac/Linux) or MPV . These players bundle their own H.264 decoders that are far superior to OpenH264. Right-click your video file -> "Open with" -> VLC. The codec error vanishes.
Respect to Cisco for solving a patent nightmare with OpenH264. But for watching the Lannister army march through the Riverlands? Leave OpenH264 for the video calls. Download VLC, grab a good x264 copy, and enjoy the siege of King's Landing the way the Old Gods intended: in smooth, block-free, high-bitrate glory.
