# \#mp4

**URL:** https://community.bitmovin.com/tag/mp4/34.md

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## [Which fragmented MP4 format would you use, and why?](https://community.bitmovin.com/t/which-fragmented-mp4-format-would-you-use-and-why/344)

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**Author:** [@anon65450478](https://community.bitmovin.com/u/anon65450478)\
**Replies:** 1\
**Last updated:** [April 2, 2024, 2:51pm UTC](https://community.bitmovin.com/t/which-fragmented-mp4-format-would-you-use-and-why/344 "2024-04-02T14:51:52Z")

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We all know and love MP4 files. Whether referred to as ISOBMFF, or CMAF, or other closely related terms that essentially refer to variations of the same container format, they are at the core of any modern streaming solu…

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## [Make HEVC MP4 codec ID consistent](https://community.bitmovin.com/t/make-hevc-mp4-codec-id-consistent/1900)

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**Author:** [@daniel.weiss](https://community.bitmovin.com/u/daniel.weiss)\
**Replies:** 2\
**Last updated:** [January 15, 2024, 11:53am UTC](https://community.bitmovin.com/t/make-hevc-mp4-codec-id-consistent/1900 "2024-01-15T11:53:08Z")

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Situation When encoding to H.265 SDR MP4 with AAC audio the codec ID of the output is “hvc1” (I would consider this the default behaviour). However, under those two circumstances the encoder deviates from the default be…

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## [What's the difference between 'hvc1' and 'hev1' HEVC codec tags for fMP4?](https://community.bitmovin.com/t/whats-the-difference-between-hvc1-and-hev1-hevc-codec-tags-for-fmp4/101)

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**Author:** [@Monycky](https://community.bitmovin.com/u/Monycky)\
**Replies:** 1\
**Last updated:** [December 29, 2021, 3:57pm UTC](https://community.bitmovin.com/t/whats-the-difference-between-hvc1-and-hev1-hevc-codec-tags-for-fmp4/101 "2021-12-29T15:57:58Z")

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HEVC video can be muxed into fMP4 using different codec tags. According to 8.4.1 HEVC video stream definition of ISO/IEC FDIS 14496-15:2019(E) there are hvc1 and hev1. But what’s the difference between the two?