Amos,
MP4 videos can contain basically any kind of actual video and audio parts: the MP4 part only refers to the container holding the audio and video together into one file.
What you’re describing sounds like you have a .mp4 file that uses a video codec that the browsers don’t support (the most common one for .mp4 that usually doesn’t work is MPEG-4 Visual/ASP, or related formats like “XviD”). For browser support your best bet is almost always H.264 video.
-John
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Hi John,Thanks for the response but then the strange thing is that I can play the same video(s) in the browser using another application: ResourceSpace. I was also previously able to play videos in Omeka in Mac OS X 10.6.8 before switching to Ubuntu. I'd therefore rule out anything being wrong with the videos [though I still maintain I'm human and prone to error].Further searches seem to indicate something to do with ffmpeg parameters but then I'm not sure where to change those.Using Firefox's Web Console, I'd noticed that the browser says, "Media resource .... could not be decoded"If I type "ffmpeg -version", I get "ffmpeg version 2.8.6-1ubuntu2..."Where could I possibly play around with video playback settings in Omeka?RegardsAmos
...And Elisha said unto him, As the LORD liveth, and as thy soul liveth, I will not leave thee. II KINGS 2:2
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