Transcode: Client endlessly requests segment 0 but never seems to get it

Server Version#: 1.24.5.5160
Player Version#: Plex Web 4.67.1, iOS 7.24.1

Transcoding begins but never seems to serve the stream to the client. I’ve replicated this on both a web client and an iOS client. In the logs, I can see the transcode start and save segments to the session directory (and can see them in the filesystem), but when the client requests a segment, it never seems to complete, resulting in a ~2-minute loop until the client finally gives up:

Oct 19, 2021 13:20:11.199 [4496] DEBUG - [Transcode/os3d54f2e9xa4zvudymxr0kv] Asked for segment 0 from session.
Oct 19, 2021 13:20:11.203 [7888] DEBUG - Request: [172.225.198.44:61856 (WAN)] GET /video/:/transcode/universal/session/os3d54f2e9xa4zvudymxr0kv/0/0.m4s (14 live) TLS GZIP Signed-in
Oct 19, 2021 13:20:11.204 [7888] DEBUG - [Transcode/os3d54f2e9xa4zvudymxr0kv] Asked for segment 0 from session.
Oct 19, 2021 13:20:11.331 [3388] DEBUG - Request: [172.225.198.44:48887 (WAN)] GET /video/:/transcode/universal/session/os3d54f2e9xa4zvudymxr0kv/1/header (15 live) TLS GZIP Signed-in
Oct 19, 2021 13:20:22.264 [0916] DEBUG - Request: [172.225.198.44:34347 (WAN)] GET /video/:/transcode/universal/session/os3d54f2e9xa4zvudymxr0kv/1/0.m4s (15 live) TLS GZIP Signed-in
Oct 19, 2021 13:20:22.265 [0916] DEBUG - [Transcode/os3d54f2e9xa4zvudymxr0kv] Asked for segment 0 from session.
Oct 19, 2021 13:20:22.668 [3408] DEBUG - Request: [172.225.198.44:28127 (WAN)] GET /video/:/transcode/universal/session/os3d54f2e9xa4zvudymxr0kv/1/header (16 live) TLS GZIP Signed-in
Oct 19, 2021 13:20:22.950 [8264] DEBUG - Request: [172.225.198.44:23223 (WAN)] GET /video/:/transcode/universal/session/os3d54f2e9xa4zvudymxr0kv/0/header (17 live) TLS GZIP Signed-in
Oct 19, 2021 13:20:23.312 [8696] DEBUG - Request: [172.225.198.44:30049 (WAN)] GET /video/:/transcode/universal/session/os3d54f2e9xa4zvudymxr0kv/0/0.m4s (18 live) TLS GZIP Signed-in
Oct 19, 2021 13:20:23.313 [8696] DEBUG - [Transcode/os3d54f2e9xa4zvudymxr0kv] Asked for segment 0 from session.
Oct 19, 2021 13:20:35.135 [4880] DEBUG - Request: [172.225.198.44:37326 (WAN)] GET /video/:/transcode/universal/session/os3d54f2e9xa4zvudymxr0kv/1/header (19 live) TLS GZIP Signed-in
Oct 19, 2021 13:20:36.674 [2608] DEBUG - Request: [172.225.198.44:50278 (WAN)] GET /video/:/transcode/universal/session/os3d54f2e9xa4zvudymxr0kv/0/header (20 live) TLS GZIP Signed-in
Oct 19, 2021 13:20:37.456 [8008] DEBUG - Request: [172.225.198.44:30202 (WAN)] GET /video/:/transcode/universal/session/os3d54f2e9xa4zvudymxr0kv/1/0.m4s (21 live) TLS GZIP Signed-in

For this repro, I chose a Plex Web client and a 4K HEVC file with a target resolution of 720p to force a transcode.

Plex Media Server Logs_2021-10-19_13-22-14.zip (386.9 KB)

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