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systemd-tmpfiles can disrupt Plex EAC3 transcoding if an active age-based cleanup rule matches a temporary EasyAudioEncoder file and removes it while Plex is using it. But an “EAE timeout” or a “Could not read” message does not prove that happened. To confirm the cause, compare the exact path and time in the Plex Media Server log with the host’s applicable tmpfiles rules and any cleanup event.
How tmpfiles aging could interrupt an EAC3 transcode
Plex uses temporary disk storage during streaming transcodes. Plex says concurrent sessions can use gigabytes, and temporary files are stored on the operating system’s boot disk by default; the location can be changed in server settings. Plex’s transcoding guidance describes this general storage behavior.
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systemd-tmpfiles creates, removes, and cleans paths according to configuration. An age threshold can make eligible entries candidates for deletion during cleanup. The rule’s type and age field matter: an omitted age or a dash does not request automatic cleanup for that entry. Age is evaluated using filesystem timestamps, including modification and access time and, for non-directories, status-change time. Exact behavior depends on the systemd version installed on the host. See the tmpfiles.d manual for the documented semantics.
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If Plex is still using a file when an applicable cleanup rule removes it, the transcode may fail. That is a plausible mechanism, not a diagnosis based on the error text alone. A message such as “EAE timeout! EAE not running, or wrong folder?” can occur for other reasons too.
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Start with the path Plex actually reports
Find the failure in the Plex Media Server logs and record the full path and timestamp of the missing or unreadable EAE file. Forum reports show paths beneath a /tmp/pms-…/EasyAudioEncoder/ directory, sometimes with a filename such as “Convert to WAV…”. These reports demonstrate the kind of path to look for; they do not establish that every Plex installation uses the same location. A forum example of EAC3 transcoding failure includes an EAE path under /tmp.
On the affected host, check whether that exact file exists, who owns it, whether Plex has permission to read and write the relevant directories, what filesystem or mount contains it, and how much space is available. If possible, determine whether the file disappears during active playback. These checks help distinguish a cleanup event from a path, access, mount, or capacity problem.
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Check whether an active tmpfiles rule covers that exact path
Inspect the tmpfiles configuration and installed manual for the host’s systemd version. Look for rules that apply to the missing file or one of its parent directories, including local configuration and overrides. The systemd-tmpfiles manual describes the utility and its system services; the specific rule, rather than a general assumption that “/tmp gets cleaned,” determines whether a path is eligible.
- Identify the logged path. Use the complete path from the Plex error, not just the fact that it begins with
/tmp. - Find the applicable rule. Check the installed tmpfiles documentation and active configuration for a rule covering that path. Confirm its rule type and age field.
- Compare times. Establish when cleanup ran and whether the file was eligible at that time. Compare the cleanup timing with the Plex error and playback session.
- Look for a direct link. The case for tmpfiles is stronger if the same file disappears at cleanup time and an applicable rule covers it. If no rule covers it, or no cleanup aligns with the failure, investigate other causes.
A rule that applies to a parent directory may matter even if it does not name the file literally. Conversely, seeing an EAE path beneath /tmp is not enough to show that a particular cleanup rule deleted it.
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Keep Plex’s documented transcode directory in scope
Plex exposes a “Transcoder temporary directory” setting for temporary files used when transcoding for streaming. Its guidance calls for free space roughly equal to the source file size plus 100 MB, and warns against choosing a network share or disk, a media-library path, or a directory that already contains data. See the Plex Transcoder guidance, last modified September 30, 2026.
Do not assume this setting redirects every EasyAudioEncoder scratch file. The documentation describes the streaming-transcode temporary directory but does not confirm that all EAE files use it. Compare the configured setting with the path in the log, and verify behavior on the affected Plex version and deployment before relying on a location change.
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When the error points somewhere else
An EAE timeout is not specific to tmpfiles cleanup. In one Synology forum case, a Plex support contributor attributed the failure to exhausted inotify watch capacity: the report included “No space left on device” while setting up watches, even though the EAE log referred to a missing audio output path. That is a case-specific alternative, not a universal explanation. The forum discussion describes that incident.
If the logged file remains present, no applicable age rule covers it, or the cleanup timing does not match the failure, check the surrounding Plex and host logs for a different error. A missing-file line can be a symptom of a broader resource or filesystem problem rather than evidence that tmpfiles removed the file.
Would a different transcode drive help?
A dedicated local SSD can be an option if the current boot or transcode volume lacks capacity and you need a local directory for streaming transcodes. Plex’s guidance supports changing the directory and gives the capacity and path constraints above; it does not recommend a particular drive. A different disk does not by itself prevent deletion: any location matched by an active age-based cleanup rule can still be cleaned.
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