Cant run multiple editly render at once on linux: Caught error Error: write EPIPE

[matukaking]

editly 0.14.2
ubuntu 22.10x64
python 3.10.7
node 16.13.2

i have installed every dependencies and the single video rendering works just fine, but when im try to render multiple video at the same time i get this error after the second video.

xvfb-run: error: Xvfb failed to start

on my local pc (win 11) multiple video rendering works fine.

do you guys know what could be the problem?

[matukaking]

UPDATE>
Im using this command to start the process:
xvfb-run --auto-servernum --server-num=1 editly --json ./datajson/${albumid}.json

i get this error:

info: Apr-17-2023 15:32:27: stdout: Caught error Error: write EPIPE
at afterWriteDispatched (node:internal/stream_base_commons:164:15)
at writeGeneric (node:internal/stream_base_commons:155:3)
at Socket._writeGeneric (node:net:795:11)
at Socket._write (node:net:807:8)
at writeOrBuffer (node:internal/streams/writable:389:12)
at _write (node:internal/streams/writable:330:10)
at Socket.Writable.write (node:internal/streams/writable:334:10)
at file:///root/.nvm/versions/node/v16.13.2/lib/node_modules/editly/index.js:367:68
at new Promise ()
at Editly (file:///root/.nvm/versions/node/v16.13.2/lib/node_modules/editly/index.js:367:32) {
errno: -32,
code: 'EPIPE',
syscall: 'write',
originalMessage: 'write EPIPE',
shortMessage: 'Command failed with EPIPE: ffmpeg -hide_banner -loglevel error -f rawvideo -vcodec rawvideo -pix_fmt rgba -s 1920x1080 -r 25 -i - -i videos/editly-tmp-uiq26rck7QO_oItdtsYZR/>
'write EPIPE',
command: 'ffmpeg -hide_banner -loglevel error -f rawvideo -vcodec rawvideo -pix_fmt rgba -s 1920x1080 -r 25 -i - -i videos/editly-tmp-uiq26rck7QO_oItdtsYZR/audio-mixed.flac -map 0:v:0 -map>
escapedCommand: 'ffmpeg -hide_banner -loglevel error -f rawvideo -vcodec rawvideo -pix_fmt rgba -s 1920x1080 -r 25 -i - -i "videos/editly-tmp-uiq26rck7QO_oItdtsYZR/audio-mixed.flac" -map ">
exitCode: undefined,
signal: undefined,
signalDescription: undefined,
stdout: undefined,
stderr: undefined,
failed: true,
timedOut: false,
isCanceled: false,
killed: false
}

[matukaking]

@mifi

do you have any idea how can i run multiple rendering at the same time without getting EPIPE error?