I cant play videos on it and its says it can play

Video Capabilities
Video Format MPEG-4 • H.264
Max Video Resolution 320 x 240
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Daniusoft video converter: Convert all mainstream video AVI, MPEG, DivX, WMV, MP4, MOV, FLV, MKV etc. to Sony walkman video fast and perfectly.

AVI is one of the file formats that are not supported by the player. Apart from that, it also fails to support h.264, h.265 (popular video codecs on YouTube), dvd media, iso, vob, vcd (windows media player doesn't play DVD), mkv (attatched support on Windows 10), rmvb, rm, swf, webm, etc.

All you need to do is to convert the file format or use other player that supports them. Here are some H.265 to H.264 converter FYI. You can also convert other file format with them.

You could use a video converter like Leawo Video Converter to convert format. https://www.leawo.org/tutorial/how-to-convert-mov-to-mp4-with-free-mov-to-mp4-converter.html

When you have videos that are not accepted by your mp3, don't worry, transcode and edit these videos with Pavtube video converter to mp3 supported format, and then add into your MP3 for playing.

Dear ,please note that Sony Walkman Video NWZ-S616F MP3 Player supports the following formats:

Supported audio files formats: AAC ,LPCM,MP3,VBR,WMA

Supported video files formats:AVC-BL(H.265),MPEG-4

If you meet some problem about formats conversion,please kindly use this tool ,it can convert any format to any formart.very exciting!
http://www.removing-drm.com/media-converter/