NACK Generator Issues: Short receiveLog & Failed Flag Update After RTX Reception

[YinongMao]

My environment.

• Version: pion/interceptor v0.1.37

1. Insufficient receiveLog Length

The current size of thereceiveLog buffer appears too short to properly track received packet sequences. This limitation causes:

• Premature invalidation of packet reception records
• Potential failure to detect actual packet loss scenarios

2. Failed Packet Flag Update After RTX Reception

When receiving packets via RTX (retransmission):

• The corresponding bit in receiveLog fails to be set to 1
• Resulting in continuous NACK regeneration for already-received packets
• Causes infinite retransmission loop and network resource waste

[arjunshajitech]

Hi,

It looks like our findings are quite similar: pion/webrtc#3063
I’ve submitted a PR to address this, but it introduces a breaking change to the API.

Let me know if you have any alternative approaches to implement this.