Plex Web playback fails on Mac (s3014/s3015/s3016)

Server Version#: Version 1.19.4.2935
Player Version#: Version 4.30.2-225a4ec

I’m running into media errors in Plex Web when playing back a file that I trimmed using ffmpeg (which means there may be dragons here). The errors are s3014/3015/3016 in quick succession. The file is MP4/HEVC/AAC (media info below), and plays properly on iOS. However, it’s not playing in Plex Web on either Safari v13.1.1 or Chrome v83.0.4103.116 (on the Mac). I can provide a link to the file privately if it would help.

Here’s the Plex Server XML:

<?xml version="1.0" encoding="UTF-8"?>
<MediaContainer size="1" allowSync="1" identifier="com.plexapp.plugins.library" librarySectionID="23" librarySectionTitle="Miscellaneous" librarySectionUUID="2d4d839295db6c23ff05e6055600558f79bbc347" mediaTagPrefix="/system/bundle/media/flags/" mediaTagVersion="1591874102">
<Video ratingKey="57426" key="/library/metadata/57426" guid="com.plexapp.agents.none://919b98efacfe0485159040cf8d8dbf6a8eb6f83b?lang=xn" type="movie" title="President John Adams" librarySectionTitle="Miscellaneous" librarySectionID="23" librarySectionKey="/library/sections/23" summary="" year="2020" thumb="/library/metadata/57426/thumb/1594654780" art="/library/metadata/57426/art/1594654780" duration="114447" originallyAvailableAt="2020-07-13" addedAt="1594654755" updatedAt="1594654780" createdAtAccuracy="epoch" createdAtTZOffset="-18000">
<Media id="211120" duration="114447" bitrate="16618" width="3840" height="2160" aspectRatio="1.78" audioChannels="6" audioCodec="aac" videoCodec="hevc" videoResolution="4k" container="mp4" videoFrameRate="24p" optimizedForStreaming="0" audioProfile="lc" has64bitOffsets="0" videoProfile="main 10">
<Part accessible="1" exists="1" id="279610" key="/library/parts/279610/1594652915/file.mp4" duration="114447" file="/data/Miscellaneous/Miscellaneous/President John Adams.mp4" size="237733408" audioProfile="lc" container="mp4" deepAnalysisVersion="4" has64bitOffsets="0" optimizedForStreaming="0" requiredBandwidths="19823,18096,16100,16100,16100,16100,16100,16100" videoProfile="main 10">
<Stream id="604220" streamType="1" default="1" codec="hevc" index="0" bitrate="16222" language="English" languageCode="eng" bitDepth="10" chromaSubsampling="4:2:0" codecID="hev1" codedHeight="2160" codedWidth="3840" colorPrimaries="bt2020" colorRange="tv" colorSpace="bt2020nc" colorTrc="smpte2084" frameRate="23.976" height="2160" level="150" profile="main 10" refFrames="1" requiredBandwidths="19428,17701,15729,15729,15729,15729,15729,15729" streamIdentifier="1" width="3840" displayTitle="4K (HEVC Main 10 HDR)" />
<Stream id="604221" streamType="2" selected="1" default="1" codec="aac" index="1" channels="6" bitrate="396" language="English" languageCode="eng" profile="lc" requiredBandwidths="379,379,379,379,379,379,379,379" samplingRate="48000" streamIdentifier="2" displayTitle="English (AAC 5.1)" />
</Part>
</Media>
<Extras size="0">
</Extras>
<Related>
</Related>
</Video>
</MediaContainer>

And a report from MediaInfo:

General
Complete name                            : President John Adams.mp4
Format                                   : MPEG-4
Format profile                           : Base Media
Codec ID                                 : isom (isom/iso2/mp41)
File size                                : 227 MiB
Duration                                 : 1 min 54 s
Overall bit rate                         : 16.6 Mb/s
Writing application                      : Lavf58.29.100

Video
ID                                       : 1
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main 10@L5@High
HDR format                               : SMPTE ST 2086, HDR10 compatible
Codec ID                                 : hev1
Codec ID/Info                            : High Efficiency Video Coding
Duration                                 : 1 min 54 s
Bit rate                                 : 16.2 Mb/s
Width                                    : 3 840 pixels
Height                                   : 2 160 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Variable
Frame rate                               : 23.976 (24000/1001) FPS
Minimum frame rate                       : 23.810 FPS
Maximum frame rate                       : 24.390 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 10 bits
Bits/(Pixel*Frame)                       : 0.082
Stream size                              : 221 MiB (98%)
Language                                 : English
Color range                              : Limited
Color primaries                          : BT.2020
Transfer characteristics                 : PQ
Matrix coefficients                      : BT.2020 non-constant
Mastering display color primaries        : BT.2020
Mastering display luminance              : min: 0.0001 cd/m2, max: 1000 cd/m2
Codec configuration box                  : hvcC

Audio
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 1 min 53 s
Duration_LastFrame                       : -3 ms
Bit rate mode                            : Constant
Bit rate                                 : 395 kb/s
Channel(s)                               : 6 channels
Channel layout                           : L R C Cb Lb Rb
Sampling rate                            : 48.0 kHz
Frame rate                               : 46.875 FPS (1024 SPF)
Compression mode                         : Lossy
Stream size                              : 5.32 MiB (2%)
Language                                 : English
Default                                  : Yes
Alternate group                          : 1

Nothing stands out to me; this bug report appears similar, but I’d be surprised if all this time later it’s the same thing.

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