O áudio do vídeo ficou melhor depois que eu usei outro microfone.

In Brazilian Portuguese, ficar often means to become, to get, or to end up in a certain state.

So:

• ficou melhor = became better / got better

This is very common with adjectives:

• ficou bom = it became good
• ficou ruim = it turned out bad
• ficou pronto = it became ready / it was finished

In this sentence, o áudio do vídeo ficou melhor means the audio improved after the speaker used a different microphone.

Melhor is the irregular comparative form of bom.

So:

• bom = good
• melhor = better

Just like in English:

• good
• better

Portuguese normally does not use mais bom in standard speech for this meaning. The natural form is:

• ficou melhor = it got better

Both structures can exist, but depois que + clause is very common and natural in everyday Brazilian Portuguese.

Here:

• depois que eu usei outro microfone = after I used another microphone

You are using a full clause with its own subject and verb:

• eu usei

Another possible structure is:

• depois de usar outro microfone = after using another microphone
• depois de eu usar outro microfone = after I use/used another microphone

In casual Brazilian Portuguese, depois que + verb is often the most straightforward choice.

Usei is the pretérito perfeito form of usar for eu.

• eu usei = I used

It is used because the action is seen as completed: the speaker used another microphone, and then the audio became better.

This tense is very common for single completed past actions in Brazilian Portuguese.

In depois que, the word que introduces a clause.

Compare:

• depois do vídeo = after the video
• depois da gravação = after the recording
• depois que eu usei outro microfone = after I used another microphone

So:

• depois de is followed by a noun or infinitive
• depois que is followed by a conjugated verb clause

That is why que appears here.

Do is a contraction of:

• de + o = do

So:

• o áudio do vídeo literally means the audio of the video

In natural English, we usually say the video's audio or the audio from the video, but Portuguese often uses de to show this relationship.

Similar examples:

• a capa do livro = the cover of the book
• o nome do professor = the teacher's name
• a cor do carro = the color of the car

Yes, often you can.

• áudio is a bit more technical or media-related
• som is broader and very common in everyday speech

So both can work:

• O áudio do vídeo ficou melhor
• O som do vídeo ficou melhor

In a context involving recording, editing, microphones, or video production, áudio sounds especially natural.

Because outro already works naturally with the noun here to mean another microphone.

• outro microfone = another microphone

This is the normal way to say it.

You may also hear um outro microfone, but that can sound more emphatic, depending on context. In most cases, outro microfone is perfectly natural and probably the most neutral choice.

Yes. In Brazilian Portuguese, subject pronouns are often optional when the verb form already makes the subject clear.

So both are possible:

• depois que eu usei outro microfone
• depois que usei outro microfone

Because usei clearly shows eu, omitting eu is natural.

Keeping eu can add clarity, emphasis, or simply reflect personal speaking style.

The sentence follows a very common Portuguese pattern:

• O áudio do vídeo = subject
• ficou melhor = main verb + adjective
• depois que eu usei outro microfone = time clause

This order is very natural in Brazilian Portuguese. It presents:

1. what changed
2. how it changed
3. when/after what event it changed

You could move parts around for emphasis, such as:

• Depois que eu usei outro microfone, o áudio do vídeo ficou melhor.

That version is also correct, but it emphasizes the time sequence first.

The sentence expresses a sequence:

1. the speaker used another microphone
2. after that, the video's audio was better

Portuguese does not need a special tense like English sometimes does with had used. The simple past usei is enough here because depois que already makes the order clear.

So the listener naturally understands:

• first: eu usei outro microfone
• then: o áudio ficou melhor

Both words have stress on the first syllable:

• áudio → roughly AU-dyu
• vídeo → roughly VI-dyu

A few helpful notes:

• the accent marks show the stressed syllable: áu-, ví-
• in many Brazilian accents, dio at the end can sound somewhat like jyu or dyu

So they are not pronounced like English audio and video, even though they look similar.

You could, but the meaning changes.

• ficou melhor = it got better / became better
• estava melhor = it was better

Ficou focuses on the change or improvement. Estava describes a state.

In this sentence, the point is that the audio improved after using another microphone, so ficou melhor is the best choice.