Description
It is designed while having a user at university (or at school) in mind, for instance a lecturer who is using it for producing tutorial videos or for recording her/his lecture while teaching using LectureNotes (by writing on the device and projecting the screen content for the audience) or a student who is using it to prepare tutorial videos for fellow students. However, it has many potential applications outside university, for instance in business or technology.
Its major target devices are tablets with Android 4.1 or later (it is developed on a Samsung Galaxy Note 10.1, an Asus Nexus 7, and a Samsung Nexus 10).
NOTE: LectureVideos cannot be used on its own, it is designed to serve as an extension for LectureNotes and can only be used in conjunction with it. If you wish to record video and audio while taking handwritten notes, please launch LectureNotes and start video and audio recording there, the resulting video and audio files will be stored within the corresponding notebook directory.
LectureVideos uses the Android MediaCodec API that became available with Android Jelly Bean to encode video and audio, so that Android 4.1 or later is required. It has been carefully tested on a Samsung Galaxy Note 10.1, an Asus Nexus 7, and a Samsung Nexus 10. However, since the behaviors of the Android MediaCodec significantly differ between devices, LectureVideos might not work on a given device.
LectureVideos does not produce a file in a container format such as MP4, AVI, or MKV containing both video and audio signals in a multiplexed fashion, instead it uses the Android MediaCodec API to produce two files per session, an H264 file containing the encoded video signal and a 3GP container file containing the encoded audio signal. This is done both to avoid legal problems (LectureVideos entirely relies on the Android MediaCodec API and does neither contain any codecs nor any other encoding, decoding, multiplexing, or demultiplexing code) as well to allow users to use their favorite container format (for instance optimized for upload or streaming) without the need to demultiplex and to remultiplex the video and audio signals. There are a very large number of tools available on all OS to multiplex encoded video and audio signals (for instance FFmpeg), and users dealing with video production are very likely to have such tool available anyhow.
If you encounter a problem with the extension, please report it to me by email (devel [a] acadoid.com), I will do my very best to fix it quickly. The same applies to suggestions and feature requests, please send them to me by email.
Major features:
* Requires only minimal permissions and no internet connection (we do respect your privacy!)
* Allows display content and audio signals to be recorded while taking handwritten notes using LectureNotes (root permissions *not* required)
* Allows recorded display content and audio signals to be replayed using LectureNotes
Possible issue: For good audio quality, it is advisable to use an external microphone, in particular when taking notes with a stylus with a hard tip in parallel (the noise that the tip causes on the device display and human voices are in the same frequency range and the former cannot be filtered away reliably).
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