What input formats does Batch Speech to Text support?

日立s　018 20

Are there any documentation or guidelines regarding the input formats supported by the Batch Speech to Text service? I have two mp4 files with different properties; one can be transcribed (bitrate 62kbps, mono, 16000kHz) , while the other cannot (168kbps, stereo, 48000kHz).
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navba-MSFT 26,805 Reputation points Microsoft Employee

2024-12-19T04:57:46.9366667+00:00
@日立s　018 Welcome to Microsoft Q&A Forum, Thank you for posting your query here!

.

The batch transcription API (and fast transcription API) supports multiple formats and codecs, such as:

WAV

MP3

OPUS/OGG

FLAC

WMA

AAC

ALAW in WAV container

MULAW in WAV container

AMR

WebM

M4A

SPEEX

.

The same is documented here.

Hope this answers.

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日立s　018 20 Reputation points

2024-12-19T07:14:46.5466667+00:00

@navba-MSFT Thanks for your answer. I tried with two files of the same format and codecs, and one was successful while the other failed. Can you explain why?
日立s　018 20 Reputation points

2024-12-19T07:17:51.39+00:00

These are the two files that I tried.
日立s　018 20 Reputation points

2024-12-19T07:18:52.4666667+00:00

These are the two files that I trie
navba-MSFT 26,805 Reputation points Microsoft Employee

2024-12-19T07:34:10.0566667+00:00

@日立s　018 Thanks for getting back. Could you please confirm if that is mp4 ? If yes that is not supported. Instead could you please try with mp3 version of this and confirm ? Awaiting your reply.
日立s　018 20 Reputation points

2024-12-19T07:44:52.6833333+00:00

@navba-MSFT Yes, they are MP4 files. I tried with an MP3 file, and it was successful. Why is it that when I try two MP4 files, one succeeds and the other fails, as I described in the topic?

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navba-MSFT 26,805 Reputation points Microsoft Employee

2024-12-19T09:31:10.32+00:00

@日立s　018 Thanks for getting back. While the mp4 container is generally supported, the service can only process streamable files. Not all mp4 files are streamable; these are probably instances of such files.

It can either be converted to a different format or amended keeping the same format by using the

ffmpeg command ffmpeg -i inputvideo.mp4 -movflags faststart -acodec copy -vcodec copy outputvideo.mp4.

Hope this answers.

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1 person found this answer helpful.
日立s　018 20 Reputation points

2024-12-19T09:41:59.7966667+00:00

@navba-MSFT Thank you for your support.
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What input formats does Batch Speech to Text support?

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