Durante a pesquisa, encontramos um vídeo curto com áudio muito claro.

Encontramos is the 1st person plural form of encontrar (to find).

In this sentence, it is most naturally understood as the preterite (simple past): we found.

A useful thing to know is that encontramos can also be the present tense form (we find), because the spelling is the same. Context tells you which one it is. Here, Durante a pesquisa makes it sound like a completed past event, so we found is the intended reading.

Durante a pesquisa means during the research/search and gives a time frame for the action.

• Durante a pesquisa = during the research/search
• Na pesquisa = in the research/search, during the search process, depending on context
• Enquanto pesquisávamos = while we were researching/searching

All of these are possible in other contexts, but they are not identical.

Durante a pesquisa is a compact, natural way to say that the finding happened in the course of the research.
Enquanto pesquisávamos would sound more verbal and explicit: while we were researching.

The comma separates an introductory phrase from the main clause.

• Durante a pesquisa = introductory time expression
• encontramos um vídeo curto... = main clause

This comma is very natural and helps readability. In short sentences, Portuguese punctuation can sometimes be flexible, but here the comma is standard and clear.

Portuguese uses definite articles more often than English.

So a pesquisa literally means the research/search, even when English might simply say during research or during the search.

Using the article here sounds natural in Portuguese. Leaving it out would usually sound less standard in this kind of sentence.

It can mean either, depending on context.

Common possibilities:

• research in an academic or formal sense
• search in a practical sense, including online searching
• sometimes even survey, in phrases like pesquisa de opinião

So in this sentence, pesquisa could refer to:

• a research project
• an investigation
• a search process

The surrounding context decides the exact nuance.

In Portuguese, adjectives usually come after the noun.

So:

• um vídeo curto = a short video

Putting the adjective before the noun is sometimes possible, but it often sounds:

• more literary
• more emphatic
• or slightly different in tone

So um curto vídeo is not the normal neutral choice here. Um vídeo curto is the everyday, natural order.

Com means with, so com áudio muito claro means with very clear audio.

This phrase describes a feature of the video:

• um vídeo curto = a short video
• com áudio muito claro = with very clear audio

Portuguese often uses com in exactly this kind of structure to add a characteristic:

• um texto com muitos erros = a text with many errors
• uma foto com boa iluminação = a photo with good lighting

Because muito here is an adverb modifying the adjective claro.

• áudio claro = clear audio
• áudio muito claro = very clear audio

When muito means very, it does not change:

• muito claro
• muito clara
• muito claros
• muito claras

But when muito is an adjective meaning much/many, it does agree:

• muito áudio = a lot of audio
• muita música = a lot of music
• muitos vídeos = many videos
• muitas fotos = many photos

Here it means very, so muito stays the same.

Yes, claro can mean light in some contexts, but it also means clear.

Examples:

• uma cor clara = a light color
• uma explicação clara = a clear explanation
• áudio claro = clear audio

In this sentence, it means the sound is easy to hear or understand clearly.

Yes. Adjectives normally agree in gender and number with the noun they describe.

Here:

• áudio is masculine singular
• so the adjective is claro

Compare:

• áudio claro = clear audio
• música clara would be grammatically feminine, though that specific phrase may or may not sound natural depending on meaning
• sons claros = clear sounds

So the ending -o matches áudio.

Yes, often you could, but the nuance may change slightly.

• áudio often sounds a bit more technical or media-related
• som is a very common everyday word for sound

Compare:

• vídeo com áudio muito claro = video with very clear audio
• vídeo com som muito claro = video with very clear sound

Both are understandable, but áudio fits especially well when talking about recordings, videos, files, microphones, and media quality.

Yes, they are important in standard written Portuguese.

• vídeo
• áudio

The accents show the stressed syllable and help mark the correct pronunciation.

In Brazilian Portuguese:

• vídeo is stressed on ví
• áudio is stressed on áu

Leaving accents out in informal typing is common online, but it is considered incorrect in standard writing.

A simple approximation is:

doo-RAN-chee ah pehs-KEE-zah, en-kohn-TRAH-moos oong VEE-dee-oh KOOR-too kong OW-dee-oh MOOY-too KLAH-roo

A few notes:

• durante in Brazil often sounds like doo-RAN-chee
• pesquisa is roughly pehs-KEE-zah
• encontramos has the stress on tra
• vídeo has three syllables: ví-de-o
• áudio also has three syllables: áu-di-o

This is only an approximation for English speakers, but it can help at the start.

Yes. Encontrar has a wider range than just to find.

Depending on context, it can mean:

• to find
• to come across
• to encounter
• to meet

In this sentence, encontramos um vídeo curto most naturally means:

• we found a short video or
• we came across a short video

So it does not always imply a deliberate search result in the same way English find sometimes does.

Yes, it is very natural.

Structure:

• Durante a pesquisa = time phrase
• encontramos = verb
• um vídeo curto = direct object
• com áudio muito claro = descriptive phrase attached to the video

This is a smooth, standard sentence in Brazilian Portuguese. A native speaker would find it normal and clear.