How to Extract Audio from a Video
Convert the media to Base64, provide the encoded value, choose a supported format, and start extraction. The operation uses the first audio stream and selects MP3 when no format is specified, provided processing prerequisites are available.
Prepare the source and output choice
Separating a soundtrack from a video is useful when you want to listen to speech independently, prepare audio for another task, or choose a file type suited to your next step. The extractor accepts media as a Base64-encoded value and processes the first audio stream it can select. Supported output choices are MP3, AAC, M4A, OGG, and WAV. When you do not provide a format, MP3 is used. This makes the procedure suitable for media that contains a selectable audio track and can be decoded by the processing environment. Before starting, identify the source file and decide whether your intended result should be compressed audio such as MP3 or a different supported format. The tool does not provide a choice of later audio streams, so check the source if it contains several tracks and the order matters to you. A result should be checked before it is used in another application, especially when the source includes multiple language tracks, commentary, or other audio streams. The input representation is part of the procedure: the original media and its Base64-encoded value are not interchangeable.
Submit the encoded media
- Identify the video or other media item whose audio you want to separate. Check its size before submission, because direct media input larger than 50 MB is rejected. 2. Convert the media into a Base64-encoded value without changing the encoded text after conversion. The extractor expects that representation rather than the original media value. 3. Enter or provide the encoded value in the input control. Review the value for accidental omissions or added characters before continuing. 4. Select an output format if MP3 is not the right choice for your purpose. The supported selections are MP3, AAC, M4A, OGG, and WAV; leaving the format unspecified selects MP3. 5. Start the extraction. Processing requires an available ffmpeg runtime, and the operation targets the first audio stream in the supplied media rather than a later stream chosen by you. 6. Inspect the returned result after processing. Confirm that it contains nonempty audio and that its format matches your selection, or MP3 when no selection was supplied. If processing fails, check whether the source can be decoded and whether a selectable first audio stream is present. A file that meets the direct-input size condition can still fail when those media conditions are not met.
Check and interpret the result
Use the selected format to identify the kind of audio returned. MP3 is the fallback when no format is specified, while AAC, M4A, OGG, and WAV are available alternatives. The track in the result comes from the first audio stream that the supplied media exposes, so a later language or commentary stream is not the target of this operation. A successful-looking response should still be checked for nonempty audio before you rely on it. If the result is empty or processing fails, consider three separate conditions: whether the media can be decoded, whether its first audio stream can be selected, and whether processing can produce output. Input size alone does not establish that extraction will succeed. The ffmpeg requirement is also a processing prerequisite, so an unavailable ffmpeg runtime prevents the operation from completing. When the source has several audio streams, compare the returned content with the first stream you expect rather than assuming that a preferred later track was selected. These checks help distinguish an unsuitable source from an incorrect output-format choice.
Worked example
You have a 12 MB MP4 lecture recording and want a WAV version of its first audio stream after supplying the recording as Base64.
Convert the MP4 to Base64, provide the encoded value, select WAV, and start extraction; then check the returned audio for content and the requested format. No numeric output value is assumed because the result depends on the supplied media and processing conditions. The source remains within the documented direct-input size condition in this situation.
A successful result should contain nonempty WAV audio from the first audio stream. Processing can fail if the MP4 cannot be decoded or has no selectable first audio stream.
Limitations
- Later audio streams cannot be selected, direct media above 50 MB is rejected, and processing depends on an available ffmpeg runtime plus decodable media with usable output.
Common errors
- If you submit the original media instead of its Base64-encoded value, or direct media input exceeds 50 MB, rejection can occur. Encode the source first and check its size before submitting it.
FAQ
Which audio formats can I choose?
The supported choices are MP3, AAC, M4A, OGG, and WAV. If you omit the format selection, the output uses MP3 by default; no other format name is documented as supported by this tool.? No, fix punctuation. The tool documents only these five output choices.
What input does the extractor accept?
The extractor expects a Base64-encoded media value. Direct media input larger than 50 MB is rejected, so check that condition before submission and do not replace the encoded value with the original file.
Which audio track is extracted?
The operation targets the first audio stream in the supplied media. Processing also needs an available ffmpeg runtime, and the source must decode and produce nonempty output for a usable result to be returned.