# Cannot play mono files **URL:** \ **Category:** FMOD Engine\ **Created:** [March 12, 2016, 1:19pm UTC](https://qa.fmod.com/t/cannot-play-mono-files/12374 "2016-03-12T13:19:54Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![cosmy](https://avatars.discourse-cdn.com/v4/letter/c/f9ae1b/32.png) [@cosmy](https://qa.fmod.com/u/cosmy)\ **Post date:** [March 12, 2016, 1:19pm UTC](https://qa.fmod.com/t/cannot-play-mono-files/12374/1 "2016-03-12T13:19:54Z")
Hello, FMOD seems to fail when loading an OGG Vorbis file (44100 Hz, Mono, 32 bits). Those OGG works: 44100 Hz, Stereo, 32 bits 44100 Hz, Mono, 24 bits But not 44100 Hz, Mono, 32 bits I’m using createSound(…) Which returns a worng format. ---
**Author:** ![brett](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/brett/32/261_2.png) [@brett](https://qa.fmod.com/u/brett)\ **Post date:** [March 12, 2016, 11:10pm UTC](https://qa.fmod.com/t/cannot-play-mono-files/12374/2 "2016-03-12T23:10:17Z")
Hi Cosmy, The FMOD examples use mono .ogg files, so yes it does work (actually you said your mono ‘24bits’ ogg worked). What confuses me is what you mean by 32bits and 24bits. Ogg does not store data in a 24 or 32bit format, it uses a compressed bitstream and decodes to floating point data. Only PCM has ‘bitdepth’ like that, not ogg vorbis. ---
**Author:** ![cosmy](https://avatars.discourse-cdn.com/v4/letter/c/f9ae1b/32.png) [@cosmy](https://qa.fmod.com/u/cosmy)\ **Post date:** [March 13, 2016, 12:22am UTC](https://qa.fmod.com/t/cannot-play-mono-files/12374/3 "2016-03-13T00:22:56Z")
You are right, but I can’t understand why audio editors such as Audacity, Adobe Audition, FL Studio, etc… can open this file while FMOD library not. I have the audio sample if you want to check. Probably an old OGG format? or some extra checks that FMOD does while other editors not? BASS audio library for example open it with no issues. Note: If I import the file in those editors and re-export it, the file magically works with FMOD. Edit: I have like 100 files that have the same issue and re-exporting them manually takes time. ---
**Author:** ![brett](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/brett/32/261_2.png) [@brett](https://qa.fmod.com/u/brett)\ **Post date:** [March 13, 2016, 6:54am UTC](https://qa.fmod.com/t/cannot-play-mono-files/12374/4 "2016-03-13T06:54:26Z")
> [@](#): > > You are right, but I can’t understand why audio editors such as Audacity, Adobe Audition, FL Studio, etc… can open this file while FMOD library not. > I have the audio sample if you want to check. > > Probably an old OGG format? or some extra checks that FMOD does while other editors not? > > BASS audio library for example open it with no issues. > > Note: If I import the file in those editors and re-export it, the file magically works with FMOD. > > Edit: I have like 100 files that have the same issue and re-exporting them manually takes time. FMOD opens every standard ogg that is produced with oggenc or oggdrop. If you can link to one of the files I can see what the issue is. You could also probably determine the issue yourself by using fmodL.dll and looking at the log file. regards, ---
**Author:** ![cosmy](https://avatars.discourse-cdn.com/v4/letter/c/f9ae1b/32.png) [@cosmy](https://qa.fmod.com/u/cosmy)\ **Post date:** [March 13, 2016, 12:44pm UTC](https://qa.fmod.com/t/cannot-play-mono-files/12374/5 "2016-03-13T12:44:33Z")
Here what the logger says: [ERR] CodecOggVorbis::openInternal : failed to open as ogg, format error. [ERR] CodecOggVorbis::openInternal : OLD FLOOR0 TYPE OGG FILE. Please re-encode sound with a newer encoder. ERR] CodecFSB5::readHeader : Header check failed. Not an FSB5 [ERR] CodecMOD::openInternal : ‘M.K.’ etc ID check failed [j?%T] [ERR] CodecS3M::openInternal : ‘SCRM’ ID check failed [ÿÿÿÿ] … ---
**Author:** ![juancito](https://avatars.discourse-cdn.com/v4/letter/j/34f0e0/32.png) [@juancito](https://qa.fmod.com/u/juancito)\ **Post date:** [March 14, 2016, 1:13pm UTC](https://qa.fmod.com/t/cannot-play-mono-files/12374/6 "2016-03-14T13:13:42Z")
yeah I noticed this bug too, I had to convert every single file to the newer encode…pretty annoying. ---
**Author:** ![brett](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/brett/32/261_2.png) [@brett](https://qa.fmod.com/u/brett)\ **Post date:** [March 17, 2016, 9:41am UTC](https://qa.fmod.com/t/cannot-play-mono-files/12374/7 "2016-03-17T09:41:52Z")
To avoid fmod runtime having redundant code for old versions of ogg vorbis (and therefore bloating memory usage) we support the more current version of the format. The versions you’re talking about are many many years old though.