Skref 1: Hladdu upp MP4 skrárnar með því að nota hnappinn hér að ofan eða með því að draga og sleppa.
Skref 2: Smelltu á hnappinn „Breyta“ til að hefja umbreytinguna.
Skref 3: Sæktu umbreyttu skrána þína M4R skrár
MP4 til M4R Algengar spurningar um viðskipti
How do I extract audio from a MP4 video as M4R?
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Upload your MP4 video. PDF.to pulls the audio track out, encodes it to M4R, and gives you a M4R-only download. The video stream is discarded.
Will the audio in the M4R match the original MP4 quality?
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If the source audio is already in a codec compatible with M4R, we stream-copy without re-encoding — bit-identical to the original. Otherwise we re-encode at 192 kbps by default for near-transparent quality.
What bitrate is the M4R output?
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Valkostir spjaldið birtir 96, 128, 192, 256, og 320 kbps — velja hærri fyrir tónlist, lægri fyrir rödd.
Can I extract only part of the MP4 as M4R?
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Yes. Use the trim controls on the upload preview to set start and end times before extracting, and only that range becomes M4R.
Does the converter handle MP4 files with multiple audio tracks?
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Yes. If your MP4 has several language or commentary tracks, you can pick which one(s) to extract as M4R in the options panel.
Will the M4R output have the same sample rate as the source?
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Já sjálfgefið. Við endursýnum ekki nema þú biður um það. 48 kHz er varðveitt frá kvikmyndaheimildum, 44. 1 kHz frá tónlistarheimildum.
Is the MP4 to M4R extraction free?
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Yes, within the free size limit. PRO supports much larger MP4 files and parallel batch extraction.
Does PDF.to read or store my MP4 content?
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No. The MP4 video and the M4R audio output are deleted within an hour. Conversion runs in an isolated worker.
Can I batch-extract audio from multiple MP4 files?
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Yes — drop a folder of MP4 videos and you will get a ZIP of M4R files back, one per source video.
Will the M4R preserve tags and metadata?
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Title, artist, and album tags are populated from the MP4 container metadata when available. You can edit them after extraction with our audio-tag tool.
Er breytirinn að vinna á straumspilun vídeó slóða?
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No — PDF.to converts files you upload, not third-party stream URLs. Download the MP4 legally first, then upload it for M4R extraction.
Why is the M4R file much smaller than the MP4 video?
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Because the video stream (typically 90%+ of file size) is discarded. Only the audio track ends up in the M4R, which is why it can drop from gigabytes to a few megabytes.
