Merge pull request #1944 from danog/perf-nal-strpos

Find H.264/HEVC start codes with strpos

Merge pull request #1943 from danog/fix-mp4-stsc-quadratic

MP4: parse the sample-to-chunk table in linear time

Merge pull request #1942 from danog/internal-retransmission-sources

Keep the retransmission sources of the participants out of the public API

Merge pull request #1940 from danog/fix-video-retransmissions

Group calls: receive the retransmissions of the remote videos

Merge pull request #1938 from danog/fix-recorder-codec-switch

Recordings follow a codec change on the same video source

Merge pull request #1936 from danog/pure-php-aac-opus

Play the AAC audio of MP4 files in calls: pure PHP AAC decoder and OPUS encoder

Merge pull request #1935 from danog/fix-fileid-test-bot-api

Tests: send FileIdTest's media once, and retry failed Bot API connections

Merge pull request #1929 from danog/fix-conference-join-log

Don't repeat "E2E conference" in the join log

Merge pull request #1928 from danog/localize-web-ui

Web UI: localize the strings left in English

Merge pull request #1918 from danog/fix-stream-receiver-on-demand

Stream mode: download the stream only to record it