Page Comparison

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• Eliminate unnecessary backward compatibility code
  • The video xModule's __init__ method is one of the slowest xBlock initialization routines - due to a whole bunch of backward compatibility code.
    • Parses XML data!
    • The Field is_set_on calls are pretty slow!
  • We no longer need to store multiple YouTube-URLs for each speed to support old browsers.  All that code can be eliminated in both the backend and front-end.
  • Get rid of "sources" field which was deprecated in favor of `html5_sources` – Quickly check from GraphCourse if sources field is still populated or being used.
  • Eliminate CDN_URLs related code in get_html method of current xmodule – Talk with Ed or Clayton.
• Have a single instance of a Video support only one of the following (don't need to have extensive fallback logic):
  • HLS-encoded, VAL-backed, VEDA-generated video
  • YouTube video
  • Support for HTML5 links may not be needed - check with Product
    • if they are still needed, keep support for it, but we still don't need to support HTML5 link + any of the above
• YouTube
  • Currently, all YouTube code is coupled with other video code.  Keep YouTube integration separate with clearer interfaces.

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• For YT videos, we get the duration and video image from YT API.
  • Analytics team also uses YT API to get the video duration
• Transcripts
  • Do we need to rely on YT for transcripts if not what are the options we've here to provide as alternative ?
    • How will the authors generate/author transcripts if we do not rely on YT subs?
      
      • Is this manual process and we shouldn't care?
  • Simplify the transcripts to incorporate new flow because currently we rely on YT transcripts. This is kind of blocker to fully support the HLS/HTML5 videos – 

    Jira Legacy
    server JIRA (openedx.atlassian.net) serverId 13fd1930-5608-3aac-a5dd-21b934d3a4b4 key EDUCATOR-323

     This is for v1.
  • We also need to change the transcript backend module to incorporate new flow i.e. HLS – HTML5 – YT for V2.
  • Currently, a transcript file is shared among the video components having the same external source url –

    Jira Legacy
    server JIRA (openedx.atlassian.net) serverId 13fd1930-5608-3aac-a5dd-21b934d3a4b4 key TNL-6539

    . So, when a video component modifies its transcript file, changes will also get reflected for other video components which are using it. 
  • Should we use edx-val subtitles for the valid edx_video_ids?: https://github.com/edx/edx-val/blob/master/edxval/models.py#L164-L209. If so then following can be considered:
    
    • Provide an option to upload transcripts on video uploads page – probably an implicit call to edx-val endpoint to create the subtitle given the language.
    • Use these subtitles for the video components that are using edx-val api to fetch the video encodings.
    • What if the transcripts are not available in edx-val for an edx_video_id? 
      • Upload transcript from video uploads page
      • Use existing transcripts(if any) from contentstore (i.e. which are primarily created for external sources) to generate subtitles for edx_video_id in edx-val.

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