Publique a transcrição antes da estreia.

Publique is a command form, not the infinitive.

• publicar = to publish
• publique = publish when speaking to você, o senhor, or a senhora

In Brazilian Portuguese, commands for você usually use the same form as the present subjunctive:

• que você publique
• publique!

If you were using tu, the command would usually be publica in standard grammar, though real-life Brazilian usage varies by region.

So Publique a transcrição... means a direct instruction: Publish the transcript...

It is usually neutral to polite, because it uses the você command form.

In Brazil, você is very common and does not automatically sound very formal. It often just sounds like a normal instruction. The sentence could appear in:

• a work instruction
• a checklist
• a subtitle guideline
• a polite but direct request

To make it softer, you could add por favor:

• Publique a transcrição antes da estreia, por favor.

A is the feminine singular definite article, meaning the.

So:

• a transcrição = the transcript / the transcription

It is used because the sentence is talking about a specific transcript, not just any transcript.

Compare:

• Publique a transcrição = Publish the transcript
• Publique uma transcrição = Publish a transcript

Also, transcrição is a feminine noun, which is why it takes a.

Transcrição literally means transcription, but in many contexts it is also the natural word for transcript.

So depending on context, it can refer to:

• the written version of spoken audio
• a transcript of a video, interview, or speech
• the act or result of transcribing

In this sentence, English might translate it as either transcription or transcript, depending on what meaning has already been given.

Because de + a contracts to da.

The expression is antes de = before.

When antes de is followed by a feminine noun with the article a, you get:

• antes de a estreia → antes da estreia

So:

• antes da estreia = before the premiere / before the debut

Other similar contractions:

• de + o = do
• de + os = dos
• de + as = das

Estreia usually means premiere, debut, or first showing/first release.

It can be used for:

• a film
• a series
• a play
• a performer
• a new production

Examples:

• a estreia do filme = the film’s premiere
• a estreia da série = the series premiere
• a estreia do ator = the actor’s debut

So in this sentence, antes da estreia means before that first public release or presentation.

Because that is the current standard spelling.

Before the spelling reform, Brazilian Portuguese often wrote this word as estréia. Under the current orthography, the standard form is:

• estreia

So if you see estréia in older texts, that is the older spelling, not a different word.

A simple Brazilian Portuguese approximation is:

pu-BLI-ki a trans-kri-SÃO an-tes da es-TREI-a

A few helpful notes:

• publique: stress on bli
• transcrição: stress on the last syllable -ção
• estreia: stress on trei
• ção sounds roughly like sown with a nasal ending, not like English see-ohn
• que in publique sounds like ki

You do not need to pronounce every unstressed vowel strongly; Brazilian Portuguese often reduces them a bit in natural speech.

Yes, but it changes the structure slightly.

• antes da estreia = before the premiere
• antes de estrear = before premiering / before it premieres

The first uses a noun: estreia The second uses a verb: estrear

So both can work, but they are not identical word-for-word.

Examples:

• Publique a transcrição antes da estreia.
• Publique a transcrição antes de o vídeo estrear.
• Publique a transcrição antes de estrear.
  This can work in the right context, but it may be less clear about what exactly is premiering.

Yes. Portuguese allows some flexibility.

You can also say:

• Antes da estreia, publique a transcrição.

This puts more emphasis on the time expression before the premiere.

Both are correct:

• Publique a transcrição antes da estreia.
• Antes da estreia, publique a transcrição.

The first sounds like a straightforward instruction. The second highlights the timing first.

No. Publique can also be a present subjunctive form.

For example:

• É importante que você publique a transcrição.

Here publique is not a direct command; it is part of a clause after que.

So the form itself can serve different grammatical roles. In your sentence, though, it is clearly an imperative because the sentence is giving an instruction.