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Message: <blockquote data-quote="Lehmden" data-source="post: 1193624" data-attributes="member: 109222">Hi.That's great as the codecs are OK then, no need to fiddle with mainconcept codec and/or permiere...This issue is not due to MP2, so (un-)installing MP2 can not help.If you really want to understand what's happening here you need to have a closer look on how the Windows DirectShow System is working. Not a trivial task. In very short...Any video has one or more "tracks". At least a single track with the picture. If not it wouldn't be a video file at all... But most videos also have one or more audio tracks, some have subtitle tracks, chapters, metatags and so on. You can use those tracks all as separate files. Subtitles are often separate files as there are a lot of them (different languages) on a DVD/BD disk It is much easier to store all those tracks into a single package. This package is called "container". Every container has it's own capabilities and it's own file extension. MP4 or MOV are container, mostly used on Apple computers. AVI and WMV are containers mostly used on Windows Systems. .TS is a container used on most broadcast stations as it has advantages while receiving it over air. MKV is the most powerful, most universal usable container today so it's the preferred container for all people who invest a lot of time in their media. There are lot more containers out there...As Video tracks are extremely large they are compressed. The compression is done by the codecs. There are lots of them, as example Mpeg2 that is normally used on DVD and SD-TV, Mpeg4 (aka DivX and/or Xvid) , Mpeg4 Level 10 often named as H264 and used on BD and HDTV and a pretty new one, h265 used on UHD BD and 4K TV. But you can compress an UHD stream with Mpeg2 and a SD stream with h265, no problem. Audio can be compressed too. Common codecs are mp3, AC3, DTS, Flac, Ogg,...To play such a video stored in a container you need to split the tracks as every type of track need a different treatment. This is where the DirectShow Splitter jumps in. It separates the Video, Audio, Subtitle,... streams and guide them to the matching codec... Aside the LAVF Splitter the most "famous" one is Haali Media Splitter but there are more outside. It looks as if this part did not work for mp4 containers on your "Lennie" system, but did work for ts and mkv...The first thing you may try is to look at the LAVF Splitter configuration tool. You will find it in start menu. Have a look on "Input Formats" if the tick is set on mp4 like it is on the screenshot below.[ATTACH=full]181519[/ATTACH] .If it is ticked, untick it, press "OK" and after that reboot your PC. If it is not ticked then tick it and do the same. Now try if the mp4 file is playing.If this do the trick, we are done. But you even may try to re-enable LAVF for mp4 files again later. It's possible this cures those issue completely. If this did not help at all, we need to investigate further...</blockquote>

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