How is a track's 30sec defined that's obtained from preview_url (Spotify Web API)? - spotify

I am interested to use an audio raw dataset provided by Spotify Web API in Python. I wonder if the audio sample follows any rules to define the 30sec provided by the preview_url.
preview_url | string | A link to a 30 second preview (MP3 format) of the track. Can be null
Is the 30sec of the track extracted from:
The first 30 sec?
The track after 1 minute?
The track between 1-3mins?
A random part of the track?

Spotify analyses every track and then is able to tell where different parts of the song begin and end.
I suppose that what you hear in the 30s preview is a guess that Spotify makes of what the refrain/main part of the songs is.
Therefore you can't generally say which part is chosen because that is determined by an AI for each song respectively.

Related

Getting total number of streams and track release date through Spotify API

I'm trying to get a large list of songs released in year X, together with their number of plays/streams.
I've been using Spotify API, and I have a number of highly popular songs. Now, for my purposes, I also need a list of non-popular songs (low play counts). I am wondering if there is any strategy to get a list of songs (maybe last played ones?), and extract their release year and number of total plays?
I've been going through the API documentation and I can only find 'popularity', which seems different from total number of plays. Secondly, I haven't found a way to get a list of last played songs yet. Should I be considering another type of strategy?
I know that you can get a list of recently played songs of all users in certain user groups in last.fm. Perhaps there is something similar in Spotify API?
Unfortunately, there is no way to get play counts through the Spotify API, only the Popularity metric.

Google actions sdk 2 nodejs response / chat bubble limit

I am using the Google-actions-sdk v2 and trying to build a gaming application. In the documentation it says conv.ask() is limited to 2 responses per turn. So this basically means I can only show 2 chat bubbles then it will not allow me to display more until after user input. But when I look at some other published applications they have many more then 2 in a row displayed. I can't seem to understand or find any info on how they can get around this limitation. 2 seems a unreasonable limit.
For speech you can merge text lines together and it will sound fine, but presentation on screen is awful without being able to break it down to more responses.
Does anyone out there have any insight on this?
In fact, everything in a single line would sound bad. Why don't you try to separate the necessary texts with the help of the SSML library, I recommend it to you.
You can use the break tag to put a pause between each text.
<speak>
I can pause <break time="3s"/>.
I can pause by second time <break time="3s"/>.
</speak>
Here you have the documentation.
Now if what you want to give is multiple selection options, you can also use the suggestion chip.
https://developers.google.com/actions/assistant/responses#suggestion_chip

Is there a way to get Mel-frequency cepstrum coefficients of a track from the Spotify API?

I am looking to get the MFCC(Mel-frequency cepstrum coefficients) of a spotify track. My main aim is to identify genre of a track, and the algorithm which I'm studying right now uses MFCC to extract features of a track.
I think there might be 2 ways to do this:
Spotify's API has an endpoint called https://api.spotify.com/v1/audio-analysis/{id}. This is what the output looks like for a track. Maybe there is a way to get MFCC from this output?
Get raw audio features of the track from an API endpoint and then use a (different) library to apply MFCC on the features.
Or, is there any other method I can try?
Thanks :)
Edit :
The output of audio-analysis API for a track given here contains a key called "tmfccrack". Is this related to the MFCC?
I found out that you can get the genre of a Spotify track by getting the genre of the corresponding artist through the Spotify API. That gets me what I want for now, but I think I should keep the question open because it asks for the MFCC of a track and not just the genre.

How to Look Up Spotify IDs (Song / Track IDs) in Bulk?

I have a list of songs - is there a way (using the Spotify / Echo Nest API) to look up the Spotify ID for each track in bulk?
If it helps, I am planning on running these IDs through the "Get Audio Features" part of their API.
Thanks in advance!
You can use the Spotify Web API to retrieve song IDS. First, you'll need to register to use the API. Then, you will need to perform searches, like in the example linked here.
The Spotify API search will be most useful for you if you can provide specifics on albums and artists. The search API allows you to insert multiple query strings. Here is an example (Despacito by Justin Bieber:
https://api.spotify.com/v1/search?q=track:"' + despacito + '"%20artist:"' + bieber + '"&type=track
You can paste that into your browser and scan the response if you'd like. Ultimately you are interested in the song id, which you can find in the uri:
spotify:track:6rPO02ozF3bM7NnOV4h6s2
Whichever programming language you choose should allow you to loop through these calls to get the song IDs you want. Good luck!
It has been a few years, and I am curious how far you got with this project. I was doing the same thing around 2016 as well. I am just picking up the project again, and noticing you still cannot do large bulk ID queries by Artist,Title.
For now I am just handling HttpStatusCode 429 and sleeping the thread as I loop through a library. It's kind of slow but, I mean it gets the job done. After I get them I do the AudioFeatures query for 100 tracks at a time so it goes pretty quickly that way.
So far, this is the slowest part and I really wish there was a better way to do it, or even a way to make your own 'Audio Features' based on your library It just takes a lot of computing cycles. However ... one possible outcome might be to only do it for tracks that you cannot find on Spotify ;s

Making a changing text ex. Making an every day video clip about weather

We recently we bought a led screen(About 8x3 mts) and it allows us to publish videos from AE (obviusly). We need to design a goodweel campaign about weather, traffic, and breaking news.
My quesion is how can i replace the animated text and images without modifyng the AE original file?, for example: The weather is sunny and 27 celsius, the next day weather changes and i just have to modify a txt.(something like that), and I just have to export the avi. file and be ready to upload it to the screen.
I don't think After Effects is an appropriate solution for this. You would have to re-render your movie every time the weather changes. That would be some heavy CPU usage just to update the news or weather. You might want to look into programming something that would update itself and using After Effects simply to render the media assets that would make up your program.
Maybe researching something like JavaScript or Processing would be beneficial.

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