It can play videos that the video and audio is compressed with codecs that the box supports. (containers and compression codecs are quite complex).
The video .avi .mp4 and .mkv are container formats, they can contain many different audio and video codecs (especially .avi that can have virtually anything within the container).
You can find what the container actually has in it by using the free programme MediaInfo. Treeview view has a full analysis of what is actually in the file (you can export this to a text file and post the info here).
https://mediaarea.net/en/MediaInfo/Download
Without this information no way to even guess why they do not work or suggest a way to convert to a format that will.
Basically you need to understand the difference between a container and the codec used to compress the video and audio. For instance .mp4 can contain video compressed with the mpeg4 video codec but also many others.
See
https://en.wikipedia.org/wiki/Comparison_of_video_container_formats
to get an idea as to what container can have in it.
The video/audio processing chip built in to the box naturally has built in capability designed to support the broadcasting standard compression codecs it will find on Freesat channels (eg for Video Mpeg2 (used by SD channels, H264/AVC used by HD channels).
Unlike a PC that you can't simply download a new codec (eg H265/HEVC used largely for 4K video compression), you are limited to the built in support.
As you may now realise the file extension, doesn't really help because it does not tell you how the video and audio within it is processed to reduce it's size and make it possible to broadcast it.
Video and audio is compressed for broadcast by using a lossy technique that basically has a full frame, followed by subframes that only have the differences from the full frame. When the signal is decoded the decoder in the box rebuilds the source video as far as possible from the original full frame and the difference data from the full frame. The whole data structure is known as a Group Of Pictures (GOP).
Hope this helps to some degree to help in how digital works.
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| Wed 28 Sep 2016 20:56:57
#3 |