As the default CentOS 7 / Gnome 3 video player, Totem, does not support many of the video formats in use today, thumbnails are not being generated by Nautilus. (Nautilus uses the Totem player to generate these). There are two causes to this problem:
1) The mp4,mkv and other formats are not supported by Totem and specific codecs need to be installed. As posted in the Fedora Forums here are some of the codecs that need to be installed for this to work properly: https://ask.fedoraproject.org/en/question/9267/thumbnail-for-videos-in-nautilus/
yum -y install gstreamer1-libav gstreamer1-plugins-bad-free-extras gstreamer1-plugins-bad-freeworld gstreamer1-plugins-base-tools updates gstreamer1-plugins-good-extras gstreamer1-plugins-ugly gstreamer1-plugins-bad-free gstreamer1-plugins-good gstreamer1-plugins-base gstreamer1
Delete the following directory:
rm -r ~/.cache/thumbnails/fail
Logout and log back in, just to make sure Gnome takes the new plugins. This step may not be necessary, but it may help.
The next thing to do is to increase the size of the files for which Nautilus can generate thumbnails. By default this is set to 1MB. (NOTE: Gnome does not recommend increase this size too much due to the impact it will have on performance. However, the speed at which the thumbnails are generated is largely dependent on the file format of the videos: MP4s are done very quickly, while FLVs take much longer.) To increase this, navigate to "File"->"Preferences"->"Preview" and change the "Only for files smaller than:" to whichever size you prefer. I've set mine to 4GBs and performance seems fine.
1) The mp4,mkv and other formats are not supported by Totem and specific codecs need to be installed. As posted in the Fedora Forums here are some of the codecs that need to be installed for this to work properly: https://ask.fedoraproject.org/en/question/9267/thumbnail-for-videos-in-nautilus/
yum -y install gstreamer1-libav gstreamer1-plugins-bad-free-extras gstreamer1-plugins-bad-freeworld gstreamer1-plugins-base-tools updates gstreamer1-plugins-good-extras gstreamer1-plugins-ugly gstreamer1-plugins-bad-free gstreamer1-plugins-good gstreamer1-plugins-base gstreamer1
Delete the following directory:
rm -r ~/.cache/thumbnails/fail
Logout and log back in, just to make sure Gnome takes the new plugins. This step may not be necessary, but it may help.
The next thing to do is to increase the size of the files for which Nautilus can generate thumbnails. By default this is set to 1MB. (NOTE: Gnome does not recommend increase this size too much due to the impact it will have on performance. However, the speed at which the thumbnails are generated is largely dependent on the file format of the videos: MP4s are done very quickly, while FLVs take much longer.) To increase this, navigate to "File"->"Preferences"->"Preview" and change the "Only for files smaller than:" to whichever size you prefer. I've set mine to 4GBs and performance seems fine.
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