Project Nephos

Developed under Google Summer of Code, 2018 with CCExtractor Development By Aaditya M Nair


One of the function of the RedHen Organisation is to record and archive Television streams they receive for future research. Project Nephos is an effort by CCExtractor to automate the entire process. Archiving is done by compressing and uploading to Google Drive. In addition to downloading and archiving, Project Nephos provides the following functionalities:

  1. Tagging of videos.
  2. Searching archived videos.
  3. Sharing videos with other entities
git clone https://github.com/AadityaNair/ProjectNephos.git
pip install ./ProjectNephos

Below is how you would manually use Nephos to perform actions manually. This requires the config file to be present. More information on the config file in the *Configuration* section.

Uploading files

nephos upload <filename>

Searching

nephos search --name <name> --tags <tag1> <tag2> ... --do_and

Search for files with <name> and/or tags <tag1> <tag2> …. The and/or part will be decided by the do_and parameter. If specified, all parameters (name, tags) will be joined by an AND i.e it will search for “<name> AND <tag1> AND <tag2> …“ If not, ANDs will be replaced by ORs.

Atleast one of –name and –tags is required.

Tagging

nephos tag --for_name <name> --add_tags <tag1> <tag2> ...

This searches for all instances that contain <name> and for each of them, add the provided tags.

Processing

nephos process <input_file> <output_file>

Converts the input file to output file. The formats are guessed by their extensions.

Permissions

Share uploaded videos with people based on the video tags.

nephos permission add --for_tags <tag1> <tag2> --share_with <email>

This command is persistent. This means that all future videos with the tag will also be shared. To avoid this action pass –not_persistent to the command.

Note, The tags provided follow the OR semantics. i.e. in the above example, every file with the tag tag1 OR tag2 will be shared.

To view all permissions,

nephos permission list

More information can be found for each sub-command by using the –help option after the sub-command

Automation

For the most part you want to just specify what to record and when leave Nephos at it. For that:

Add channels

Add channel to specify where to download stuff from

nephos channel add --name 'CNN' --ip_string '1.2.3.4:5678'

Note that the name should be unique for each channel.

To view added channels.
nephos channel list

Add job.

Specify when to download other post download options.

nephos job add --name <jobname> --channel <channel> --start <starttime> --duration <length> \
               --upload --convert_to <format> --tag <tag1> <tag2>

Following are mandatory arguments:
–name is the name of the job. This should be unique for each job.
–channel is the name of the associated channel. This channel should have already been added by the channel add subcommand.
–start is the start time of the job written in the popular cron format. For more info on the format go here. This was used as an reference.
–duration is how long you want to record. This is provided in minutes.

Rest are optional arguments:
–upload instructs nephos to upload the file to Google Drive. This will most likely be the default case in the future versions. In such a case, this option will be removed.
–convert_to makes so that the downloaded file is converted to the provided format before being uploaded.
–tag tags the uploaded file with the provided tags.

Note that –tag is dependent providing the –upload option. If it not provided –tag is a NOOP.

TV Listings

Nephos also has a crude API that supports TV listings.

nephos schedule add --name <program_name> --channel <channel> --start <starttime> --duration <length> --tags <tag1> <tag2>

This syntax is pretty much exactly the same as for the job add above. The `tags` are associated with the program. This allows for a separate syntax to add a job:

nephos job add --name <jobname> --program_tags <tag1> <tag2> .. \
             --upload --convert_to <format> --tag <tag1> <tag2>

This will find all programs with any of the provided tags and add them as jobs.

Initialise Server

This starts the orchestration server which is responsible for the record → process → upload pipeline. This will also create all the relevant directories and perform OAuth with google drive, if not done already.

nephos init

Currently, if a job is added after the server is started, it will not be picked up by the server. So, make sure you add all the jobs before starting the server. This will be fixed in a later version.

Currently the project lives on the above provided github link.

The wiki contains more information about the internals of the project.

There is still a lot of stuff that can be improved here. Have a look at the issues to know what can be done and don't hesitate to create a new one if you find something new.

  • public/gsoc/2018/aaditya.txt
  • Last modified: 2018/08/15 23:19
  • by aadityanair