dev1an/bug-avplayer-cea708

Subtitles are scrambled using the native video player in Safari on macOS an iOS.

bug-avplayer-cea708's Issues

Broken stream

Response from Apple (2 May 2022)

The data loss is caused by a broken stream (cc (Continuity Counter) errors in the TS packet headers)!

The last TS packet for the video PID (100) in the first segment (offset 1270692) has a cc error and the first TS packet for PID 100 in the second segment (offset 1880) as well (in a way caused by the previous cc error).

This causes us to drop the video frame which contains the caption packet in an SEI NALu.

Other software might reply a different implementation of error handling and play the captions.

For reference:
Our error handling when we encounter a cc error, is to drop all previously received, incomplete packet data and start new with the data from the current packet and the new cc.
If we would parse all NALu we received completely or completely drop the cc error packets with an adaptation field value of 0 or 2, this stream would play. But it this is not an option since it leads to other problems and will break other streams.