Don't send FEC for H.264 with NACK enabled.

The H.264 does not contain picture IDs and are not sufficient to
determine that a packet may be skipped. This causes retransmission
requests for FEC that are currently dropped by the sender (since they
should be redundant).

The receiver is then unable to continue without having the packet gap
filled (unlike VP8/VP9 which moves on since it has a consecutive stream
of picture IDs).

Even if FEC retransmission did work it's a huge waste of bandwidth,
since it just adds additional overhead that has to be unconditionally
transmitted. This bandwidth is better used to send higher-quality
frames.

BUG=webrtc:5264
R=stefan@webrtc.org

Review URL: https://codereview.webrtc.org/1687303002 .

Cr-Commit-Position: refs/heads/master@{#11601}
4 files changed
tree: d75a42f68cb077fd6cfe67f0f12c2602ad59d3b0
  1. build_overrides/
  2. chromium/
  3. data/
  4. infra/
  5. resources/
  6. talk/
  7. third_party/
  8. tools/
  9. webrtc/
  10. .clang-format
  11. .gitignore
  12. .gn
  13. all.gyp
  14. AUTHORS
  15. BUILD.gn
  16. check_root_dir.py
  17. codereview.settings
  18. COPYING
  19. DEPS
  20. LICENSE
  21. license_template.txt
  22. LICENSE_THIRD_PARTY
  23. OWNERS
  24. PATENTS
  25. PRESUBMIT.py
  26. pylintrc
  27. README.md
  28. setup_links.py
  29. sync_chromium.py
  30. WATCHLISTS
README.md

WebRTC is a free, open software project that provides browsers and mobile applications with Real-Time Communications (RTC) capabilities via simple APIs. The WebRTC components have been optimized to best serve this purpose.

Our mission: To enable rich, high-quality RTC applications to be developed for the browser, mobile platforms, and IoT devices, and allow them all to communicate via a common set of protocols.

The WebRTC initiative is a project supported by Google, Mozilla and Opera, amongst others. This page is maintained by the Google Chrome team.

Development

See http://www.webrtc.org/native-code/development for instructions on how to get started developing with the native code.

More info