I am trying to save how much time a user spent watching video.
I stumbled upon the played video attribute:
It’s worth mentioning the played property — this tells us which time ranges have been played within the media. For example:
var played = audio.played; // returns a TimeRanges object
This could be useful for establishing the parts of your media that are most listened to or watched.
In my React app, I tried using that like this:
handleStateChange(state, prevState) {
const { played } = state;
for (let index = 0; index < played.length; index++) {
const beginning_of_played_segment = Math.trunc(played.start(index));
const end_of_played_segment = Math.trunc(played.end(index));
}
}
handleStateChanged
is used to subscribe to the video player state change:
componentDidUpdate(prevProps, prevState) {
if (this.state.player && !this.state.hasSubscribedToPlayerState) {
this.state.player.subscribeToStateChange(
this.handleStateChange.bind(this)
);
this.setState({
hasSubscribedToPlayerState: true,
});
}
}
If I play the video between [0..8] and [347..357] secnds, the function handleStateChange
logs something like this:
🚀 ~ file: VideoItem.js ~ line 212 ~ VideoItem ~ handleStateChange ~ beginning_of_play_segment 0
🚀 ~ file: VideoItem.js ~ line 212 ~ VideoItem ~ handleStateChange ~ end_of_play_segment 8
🚀 ~ file: VideoItem.js ~ line 212 ~ VideoItem ~ handleStateChange ~ beginning_of_play_segment 347
🚀 ~ file: VideoItem.js ~ line 212 ~ VideoItem ~ handleStateChange ~ end_of_play_segment 357
And then I thought I could just calculate the difference between all the beginning_of_played_segment
and end_of_played_segment
values.
The problem with this approach is that if I replay the video in a previously played segment, for example if I restart the video in the segment [0..8] in second 4, played
will not create a new segment, and it will continue counting in that same segement.
For example, if I restart in 4, and continue playing until 13, the segment [0..8] will become [0..13].
This makes sense given that the played
property tells us which time ranges have been played within the media.
However, I would like to know if there's a property that would allow me to achieve my goal, of creating a new segment, everytime the user plays the video anywhere so that I can record how much time exactly he spent watching the video.
I have managed to implement a workaround. However, I am not sure this is the best approach. But, it works:
constructor() {
super();
this.state = {
start_of_current_segment: 0,
current_segment_duration: 0,
segments: [],
total_segments_duration: 0,
};
}
handlePlayerStateChange(state, prevState) {
const userHasJustPlayedVideo = prevState.paused && !state.paused;
const userHasJustPausedVideo = !prevState.paused && state.paused;
const { currentTime, seeking, hasStarted } = state;
const has_user_moved_video_to_a_new_position = seeking;
let { start_of_current_segment, segments } = this.state;
if (userHasJustPlayedVideo) {
segments = [...segments, 0];
this.setState({
start_of_current_segment: Math.trunc(currentTime),
segments: segments,
});
} else if (userHasJustPausedVideo) {
} else if (has_user_moved_video_to_a_new_position) {
segments = [...segments, 0];
this.setState({
start_of_current_segment: Math.trunc(currentTime),
segments: segments,
});
} else if (hasStarted) {
const current_segment_duration =
Math.trunc(currentTime) - start_of_current_segment;
const segment_index = segments.length - 1;
segments[segment_index] = current_segment_duration;
let total_segments_duration = 0;
for (
let segment_index = 0;
segment_index < segments.length;
segment_index++
) {
total_segments_duration += segments[segment_index];
}
this.setState({
current_segment_duration: current_segment_duration,
segments: segments,
total_segments_duration: total_segments_duration,
});
}
}