Transcription Tips

Best practices for getting accurate transcripts and fixing timing issues

Choosing the Right Audio

Not all audio is created equal for transcription. The quality of your source material directly affects how accurate the transcript will be. Here's what to look for:

Content Type Transcription Quality Notes
Language learning podcasts Excellent Clear speech, minimal background noise
Audiobooks Excellent Professional recording quality
News broadcasts Excellent Clear enunciation, standard accent
Interviews Good Varies by recording quality
Casual podcasts Good Natural speech, occasional crosstalk
TV shows/anime Fair Background music affects accuracy
Movies Fair Sound effects and music mix with dialogue
Live recordings Variable Depends heavily on recording conditions

Pro tip: For TV shows and movies, try importing existing subtitles instead of transcribing. Most popular content has accurate subtitles available.

Audio Quality Factors

Background Noise

Music, traffic, crowds, and other background sounds confuse the transcription model. Choose recordings with clean audio or use noise reduction software before transcribing.

Speaking Speed

Very fast speech leads to more errors. Whisper handles normal conversational speed well, but rapid-fire speech or heavily slurred casual talk may have issues.

Multiple Speakers

Overlapping speech is challenging. One speaker at a time produces the best results. Interviews with turn-taking work better than heated debates.

Audio Encoding

Higher bitrate = better quality transcription. 128kbps MP3 is the minimum for good results. Lossless formats (FLAC, WAV) work best but aren't necessary for most content.

Fixing Transcription Errors

Even with perfect audio, some errors are inevitable. Mimikaki makes it easy to fix them:

Editing Text

  1. Click the pencil icon on any transcript line
  2. Make your corrections
  3. Click the checkmark button or press Enter to save, or click the X to cancel

Your edits are saved automatically and persist when you return to the session.

Adjusting Timing

Sometimes the text is correct but the timing is off. To fix segment boundaries:

  1. Look at the waveform display with colored annotation boxes
  2. Drag the edges of any box to adjust start/end times
  3. Click inside a box to play just that segment

This is especially useful when Whisper groups sentences incorrectly or splits a sentence in an awkward place.

Split, Merge, Delete & Create

Beyond dragging edges, you can restructure segments directly:

  1. Split (scissors icon) — divide a segment into two at the midpoint, then drag edges to fine-tune
  2. Merge (merge icon) — combine a segment with the one after it, joining their text
  3. Delete (trash icon) — remove a segment entirely
  4. Add Annotation — create a new blank segment at the end of the timeline

You can also start with a blank transcript (no segments) and build your annotations from scratch using the "Blank Transcript" option on the dashboard.

Common Transcription Mistakes

Homophones

Words that sound alike but have different meanings often get confused:

Review these based on context and correct as needed.

Proper Nouns

Names of people, places, and brands are frequently wrong. Whisper may:

Numbers and Dates

Numbers can come out as words or digits inconsistently. Japanese numbers are particularly tricky with the counting system (一つ vs 1つ vs ひとつ).

Workflow Tips

First Pass: Listen and Read

Don't fix everything immediately. First, listen through while reading to understand the content. This helps you catch errors you might miss without context.

Second Pass: Quick Corrections

Go back and fix obvious errors - wrong kanji, misspellings, clearly wrong words. These are usually quick to spot and fix.

Third Pass: Timing Adjustments

If you're planning to use this for study later, adjust any segment boundaries that split sentences awkwardly or group unrelated content together.

Export Options

Once you're happy with the transcript, you can:

When to Skip Transcription

Sometimes it's better not to use AI transcription:

Subtitles Already Exist

Check if your content has subtitles before transcribing:

Importing existing subtitles is always free and often more accurate than re-transcribing.

Heavy Music or Effects

If audio has significant background music or sound effects throughout (like an action movie), consider using existing subtitles. The transcription will have many errors that take longer to fix than it's worth.

Ready to practice?

Upload some audio or try the demo to see these features in action.

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