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Dropcaster - Simple Podcast Publishing

This project is developed with the readme-driven development method. This file describes the functionality that is actually implemented, whereas the vision reflects where the tool should go.

Dropcaster is a podcast feed generator for the command line. It works with any (static file) web hoster.

Author: Nicolas E. Rabenau [email protected]

What is the problem that Dropcaster is trying to solve?

You have a number of podcast episodes that you would like to publish as a feed. Nothing else - no fancy website, no stats, nothing but the pure podcast.

With Dropcaster, you simply put the mp3 files into the public_html folder of your web host. Then run dropcaster - it generates the feed and writes it to a file, e.g. index.rss. You can then take the RSS file's URL and publish it as the feed URL.

The feed URL can be consumed by any podcatcher, e.g. iTunes or Juice.

Installation

As a Ruby Gem

$ gem install dropcaster
$ dropcaster --help

libxml-ruby is a frequent offender with installation problems. As usual, Stack Overflow has the answer (at least for macOS with Homebrew):

$ gem install --no-document libxml-ruby -- --with-xml2-config="$(brew --prefix libxml2)/bin/xml2-config"

Docker

If you prefer Docker over a local installation, use

$ docker run -it --rm nerab/dropcaster dropcaster --help

The container will need access to the mp3 files on your workstation with a bind mount. For instance, running dropcaster with the test fixtures will look like this:

$ docker \
    run \
      -it \
      --rm \
      --mount type=bind,source="$(pwd)"/test/fixtures,target=/public_html \
    nerab/dropcaster

Replace "$(pwd)"/test/fixtures with your own folder of mp3s, and you can run the command above without even installing Ruby.

Basic Usage

Once Dropcaster is installed, the only two other things you will need are a channel definition and one or more mp3 files to publish.

Let's start with the channel definition. It is a simple YAML file that holds the general information about your podcast channel. According to the RSS 2.0 spec, the only mandatory information that your channel absolutely needs are a title, a description and a link to a web site where the channel belongs to.

The simplest channel file looks like this:

:title: 'All About Everything'
:description: 'A show about everything'
:url: 'http://www.example.com/podcasts/everything/index.html'

Store this file as channel.yml in the same directory where the mp3 files of your podcast reside. The channel definition is expected to be present in the same directory as your mp3 files, but this can be overridden using a command line switch. You can find a more elaborate example for the channel definition in the doc folder of the Dropcaster gem. You can find it by running gem open dropcaster.

Now that we have the podcast channel defined, we need at least one episode (an audio file) in it. From Dropcaster's perspective, it does not matter how the episode was produced, but the critical information is the meta data in the mp3 file, because that is the authoritative source for the episode information. Almost all audio editors can write metadata, usually called ID3 tags. Dropcaster reads these tags from the mp3 files and fills the item element in the feed (that's how an episode is defined, technically) from it.

With all required pieces in place, we could generate the podcast feed. Just before we do that, we will inspect the feed by running the following commands:

$ cd ~/public_html
$ dropcaster

(The above lines assume that public_html is the web server's document root, and that there is at least one mp3 file in public_html).

Dropcaster will print the feed to standard-out, without writing it to disk. When you are happy with the results, call Dropcaster again, but redirect the output to a file, this time:

$ dropcaster > index.rss

If all went well, you will now have a valid podcast feed in public_html, listing all mp3 files as podcast episodes. Please see the section Publish Your Feed for details on how to find the public URL of your feed.

Use Cases

Publish a New Episode

Drop the mp3 file into the public_html folder, and then run the following command in that directory:
```
$ dropcaster > index.rss
```
Sync the updated index.rss file to the public web server, and any podcast client will download the new episode as soon as it has loaded the updated index.rss.

Delete an Episode

Remove the mp3 you want to delete from the public_html folder, and then run the following command in the directory where the remaining mp3 files reside:
```
$ dropcaster > index.rss
```
Sync the updated index.rss file to the public web server. Podcast clients will no longer download the removed episode.

Replace an Episode With an Updated File

In the public_html folder, replace the mp3 you want to update with a new version, and then run the following command in the directory where the mp3 files reside:
```
$ dropcaster > index.rss
```
Sync the updated index.rss file to the public web server. Podcast clients detect the change and download the updated episode.

Generate a Podcast Feed for a Subset of the Available MP3 Files

Dropcaster accepts any number of files or directories as episodes. For directories, all files ending in .mp3 will be included. For advanced filtering, you can use regular shell patterns to further specify which files will be included. These patterns will be resolved by the shell itself (e.g. bash), and not by Dropcaster.

For example, in order to generate a feed that only publishes MP3 files where the name starts with 'A', call Dropcaster like this:

$ dropcaster A*.mp3 > index.rss

Publish More than One Feed

$ dropcaster project1 > project1.rss
$ dropcaster project2 > project2.rss

or

$ cd project1
$ dropcaster > index.rss
$ cd ../project2
$ dropcaster > index.rss

Include Episodes From Two Subdirectories Into a Single Feed

$ dropcaster project1 project2 > index.rss

Advanced features

Overriding defaults

Dropcaster is opinionated software. That means, it makes a number of assumptions about names, files, and directory structures. Dropcaster will be most simple to use if these assumptions and opinions apply to your way of using the program.

However, it is still possible to override Dropcaster's behavior in many ways. You can, for instance, host your episode files on a different URL than the channel. Instead of writing title, subtitle, etc. to a channel.yml, you may also spedify them on the command line.

In order to find out about all the options, simply run

$ dropcaster --help

Using custom channel templates

Dropcaster generates a feed that is suitable for most podcast clients, especially iTunes. By default, dropcaster follows Apple's podcast specs / recommendations.

It is also possible to customize the channel by supplying an alternative channel template on the command line. Start your own template by copying the default template, or look at the test directory of the dropcaster gem. You can get there by running gem open dropcaster.

Generate a HTML page for your podcast

Besides generating an RSS feed, dropcaster can also generate HTML that can be used as a home page for your podcast. The template directory contains a sample template that can be used to get started:

$ dropcaster --channel-template templates/channel.html.erb

As discussed above, the output of this command can be written to a file, too:

$ dropcaster --channel-template templates/channel.html.erb > ~/public_html/allabouteverything.html

Dropcaster works exactly the same, whether it generates an RSS feed or a HTML page. Therefore, all options discussed before also apply when generating HTML.

A Note on iTunes

The generated XML file contains all elements required for iTunes. However, Dropcaster will not notify the iTunes store about new episodes.

Using Dropcaster With S3 or Digital Ocean Spaces

If you set up an S3 bucket or Digital Ocean Space (or any other s3 compatible static asset host), you can easily sync your local podcast directory using a command line tool like s3cmd.

After installing s3cmd, make sure you have the right credentials to write to your bucket/space. Add your mp3 files to your folder, run dropcaster > index.rss and then s3cmd sync ./ s3://$your-bucket-name --acl public-read. S3cmd will now upload any new or changed files to your bucket.

Episode Identifier (uuid)

Dropcaster uses a rather simple approach to uniquely identify the episodes. It simply generates a SHA1 hash of the mp3 file. If it changes, for whatever reason (even if only a tag was changed), the episode will get a new UUID, and any podcatcher will fetch the episode again (which is what you want, in most cases).

I Don't Like the Output Format that Dropcaster produces

Dropcaster uses an ERB template to generate the XML feed. The template was written so that it is easy to understand, but not necessarily in a way that would make the output rather nice-looking. That should not be an issue, as long as the XML is correct.

It you prefer a more aesthetically pleasing output, just pipe the output of Dropcaster through xmllint, which is part of libxml:

$ dropcaster | xmllint --format -

For writing the output to a file, just redirect the ouput of the above command:

$ dropcaster | xmllint --format - > index.rss

Web site

Dropcaster uses Steve Klabnik's approach for publishing the site with Travis CI.

nerab / dropcaster Goto Github PK

dropcaster's Introduction

Dropcaster - Simple Podcast Publishing

What is the problem that Dropcaster is trying to solve?

Installation

As a Ruby Gem

Docker

Basic Usage

Use Cases

Publish a New Episode

Delete an Episode

Replace an Episode With an Updated File

Generate a Podcast Feed for a Subset of the Available MP3 Files

Publish More than One Feed

Include Episodes From Two Subdirectories Into a Single Feed

Advanced features

Overriding defaults

Using custom channel templates

Generate a HTML page for your podcast

A Note on iTunes

Using Dropcaster With S3 or Digital Ocean Spaces

Episode Identifier (uuid)

I Don't Like the Output Format that Dropcaster produces

Web site

Copyright

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