[BUG] New ffmpeg: OGG Transcoding Audio drops/stutter

Plex Media Server Plex Pass Betas
1

The new plex pass beta that inludes the updated ffmpeg version seems to introduce this bug. Any music transcodes to OGG introduce silence into the transcoded file. The playback with stutter. Downgrading my server to a public build resolved the problem for now.

A good write up on the issue by someone else was posted on reddit a few weeks ago. Here’s there log:

<SessionReport version="2" startTime="0" startTimestamp="Oct 02, 2025 00:37:30.514" key="/library/metadata/129791" session="XXX" transcode="dba0efa1-d0ee-4f6e-832f-a3064aa072f8-249143"> 
<User id="1" thumb="https://plex.tv/users/XXX" title="XXX" /> 
<Player address="XXX" device="Android" machineIdentifier="XXX" platform="Generic" platformVersion="16" product="Plexamp" remotePublicAddress="XXX" title="Android" version="4.12.4" local="0" relayed="0" secure="0" userID="1" /> 
<Variants> <Variant id="3218838a-ad9e-47af-95b8-7ef064994f2d" targetBitrate="128" context="streaming" sourceAudioCodec="flac" audioDecision="transcode" protocol="http" container="ogg" audioCodec="opus" audioChannels="2" transcodeHwRequested="1" transcodeHwFullPipeline="0"> 
<Media hasVoiceActivity="0" id="119393" audioChannels="2" audioCodec="opus" bitrate="121" container="ogg" duration="105733" selected="1"> 
<Part accessible="1" deepAnalysisVersion="6" exists="1" hasThumbnail="1" id="142985" requiredBandwidths="1040,1040,1040,1040,1040,1040,1040,1040" bitrate="121" container="ogg" duration="105733" decision="transcode" selected="1"> 
<Stream albumGain="-12.75" albumPeak="0.999939" albumRange="3.367442" bitrate="121" bitrateMode="cbr" channels="2" codec="opus" displayTitle="FLAC (Stereo)" extendedDisplayTitle="FLAC (Stereo)" gain="-12.75" id="229490" loudness="-6.28" lra="2.46" peak="0.988556" requiredBandwidths="1034,1034,1034,1034,1034,1034,1034,1034" selected="1" streamType="2" decision="transcode" location="direct" /> </Part> </Media> </Variant> </Variants> <SegmentList><FileVariant size="15213" variant="3218838a-ad9e-47af-95b8-7ef064994f2d" /> </File> 
<Timelines> <Transcode startTime="91" endTime="100" complete="1" fileType="av" variant="3218838a-ad9e-47af-95b8-7ef064994f2d" /> </Timelines> </Segment> <Segment duration="1000" startOffset="9000" endOffset="10000"> <File name="chunk-00009" type="av"> 

<FileVariant size="0" variant="3218838a-ad9e-47af-95b8-7ef064994f2d" /> </File> <Timelines> 

<Transcode startTime="100" endTime="110" complete="1" fileType="av" variant="3218838a-ad9e-47af-95b8-7ef064994f2d" /> </Timelines> </Segment> <Segment duration="1000" startOffset="10000" endOffset="11000"> <File name="chunk-00010" type="av"> <FileVariant size="0" variant="3218838a-ad9e-47af-95b8-7ef064994f2d" /> </File>`
2 Likes
2

Do you have a sample file that you could share?

3

Can you walk me through getting the file you need? It happens when I play back any transcoded audio file on Plexamp. I’ve tried combining the chunk files in /tmp/Transcode/Sessions with cat header chunk-00* > combined.ogg and the file it outputs does not have any silence in it.

It’s most obvious when playing back via plexamp.

4

Sorry, I did more testing and it isn’t fixed. There must have been already transcoded songs in my plexamp cache.

5

I had the same issue with the beta. Every song that was transcoded, stuttered.

I also downgraded to latest stable release and works fine.

Apparently it is coming from the Upgrade to FFmpeg 6.1 but i don’t know.

Can we somewhere report the issue, that the issue hopefully will not be in the public release?

1 Like
6

Is there a setting in Plex server that can fix this issue? I’m running beta on Synology NAS; downgrading is problematic…

7

I’m also experiencing this issue, OGG transcoding is basically useless now.

8

This should be fixed in the latest beta.

1 Like