SubjectivePlayer
A video player for Android, enabling subjective quality assessment.
Author: Werner Robitza
Features
- Playback:
- Multiple video codecs: H.264, H.265/HEVC, VP9, VP8, AV1
- Multiple container formats: MP4, WebM, MKV, 3GP
- Edge-to-edge playback, utilizing the full screen, or avoiding display cutouts and rounded corners
- Config files to define which videos to show to which subjects -- different playlists for different subjects may be used
- Rating:
- After each video, subjects are asked for their opinion using different methodologies:
- 5-point ACR (Absolute Category Rating) categorical scale (Excellent/Good/Fair/Poor/Bad) from ITU-T Rec. P.910
- Continuous slider-based rating (0-100)
- Continuous real-time rating using volume buttons
- (DSIS impairment scale -- not fully implemented)
- General:
- Subject ratings are based on IDs, so we can identify different participants later
- Logging of the subject ratings to CSV files
- On-device validation of config files
- Internationalization (i18n) support:
- 🇺🇸 English
- 🇩🇪 German
- 🇫🇷 French
- 🇮🇹 Italian
- 🇪🇸 Spanish
- 🇯🇵 Japanese
- 🇰🇷 Korean
- 🇨🇳 Chinese (Simplified)
- Session management:
- Training sessions to familiarize subjects with the rating procedure
- Breaks between videos to prevent viewer fatigue
- Pre- and post-questionnaires to collect participant data
Here the ACR rating screen is shown after a video playback:
Recent Changes
- v2.x -- Complete rewrite using new Android dependencies and many more features.
- v1.1 -- Commit 323123 -- updates for ITU-T Rec. P.1203 model development in 2017
- v1.0 -- Commit 742593b69cc4096368d9cbcafce362a3d9d2236c -- initial commit in 2012
For more details, see the Changelog.
Quick Start
For running the app, you need:
- Android device running Android 7.0 (Nougat) or higher (API level 24+)
- Storage access for video files and playlists
Pre-built APKs are available from the Releases page. These are unsigned builds.
See the Installation guide for detailed instructions.