Obi: Record audio and mark structure on the fly

Original Author(s): Prashant Ranjan Verma

Step 1: Set up the Project

You will need to create a new project in Obi by providing the book title and storage location. Refer to the topic Creating a New Project in Obi manual for more information on this step.

Step 2: Create a section for recording

You need to have at least one section in the project to begin recording. During creation of the project if you had selected the option “Automatically create a title section with this title”, then your project will have a section with the same name as the project title. In such a case, you don’t necessarily have to create another section before going to the next step of this method. However, if you chose not to create a section having the same name as the title of the project, then you need to add a section. See the topic Adding a Section for alternate ways of creating a section.

Step 3: Record audio and mark structure

Start recording in the section available in the project after having set audio preferences. You should now use the transport bar buttons or various shortcut keys for marking new sections or headings, pages and Todo positions. See the section Live Recording for information on the structure markup during recording. As you press a button or press a keyboard shortcut, the new phrase now being created during this ongoing recording is assigned the role you select.

For example, if you are recording the book by reading out its contents, and you reach a point where a new section is about to start, then you just need to press the key “H” or press the “Next Section” button on the transport bar without stopping recording. You should continue to read out the contents of the new section from the book. You will observe that a new section will be created automatically in your project, and all new phrases will get created in this section. Note that these new sections will have a default name, so you will have to manually rename them during the editing of the project.

Step 4: Edit the audio and mark pages

Audio editing will have to begin with Phrase Detection. You may note that unlike most other DAISY authoring tools, Phrase Detection does not happen during live recording or audio importing in Obi. You should Apply Phrase Detection after you have finished recording or importing audio files. Based on the preceding silence phrase or values you choose, Obi will break the existing phrases into several phrases based on the detection of silence in the audio. See the topic Auto-Splitting the Phrase for applying phrase detection.

After phrase detection, you will have to play and listen to each phrase to locate problems such as unwanted sounds, mistakes in narration, missing narration, repetition, etc. You may have to use all the audio editing tools – select and delete, crop audio, split or merge, etc for creating appropriate phrases. See the topic Working with Phrases for information on audio editing in Obi.

Step 5: Cleanup, review Meta Data and book structure

If your recording includes page announcements, you should mark all those phrases containing recording such as page 1, page 2 etc. as pages. See the topic Pages and Special Roles for working with pages in Obi.

After editing the book audio, use the information in the topic Cleaning Unreferenced Audio to delete unwanted audio files from your project. It is important to note that till this operation is performed, it is possible to restore any audio that you had previously deleted during editing. If this command is not used, the project folder will contain those unused audio files, and unnecessarily occupy additional space on the storage media.

See the topic Metadata View to provide mandatory and recommended information about the book such as author, publisher etc. in the project.

Review the book structure in the TOC view to confirm that it aligns with the print source. You should make the necessary changes in the section name, level or sequence at this stage.

Step 6: Export to Daisy and Validate DTB

See the topic Exporting and Validating DTB to convert your project from the Obi specific format to Daisy DTB. You should then validate the project using the command available in the TOOLS menu. Book Validation is highly recommended and you should not distribute a book that is not valid as per Daisy standards. Such books may not play on all hardware and software playback tools.

Step 7: Encode audio to MP3 for distribution

In most cases, the project size will be too large, and you may want to create a compressed version for distribution. You can convert the audio in your project to MP3 format at a suitable bit rate. See the topic Encoding Audio to mp3 for audio compression. Please note that if you opted to encode the exported audio files in MP3 format during the export operation, you should omit this step.

See also

DAISYpedia Categories: 

This page was last edited by PVerma on Monday, February 18, 2013 22:22
Text is available under the terms of the DAISY Consortium Intellectual Property Policy, Licensing, and Working Group Process.