# \#fmp4

**URL:** https://community.bitmovin.com/tag/fmp4/35.md

[Latest](https://community.bitmovin.com/latest.md) · [Categories](https://community.bitmovin.com/categories.md) · [Tags](https://community.bitmovin.com/tags.md)

---

## [Playback issue with ffmpeg generated HLS stream (using fmp4 segments) on Chrome/Edge](https://community.bitmovin.com/t/playback-issue-with-ffmpeg-generated-hls-stream-using-fmp4-segments-on-chrome-edge/3053)

<div class="topic-metadata">

**Author:** [@spaek](https://community.bitmovin.com/u/spaek)\
**Replies:** 2\
**Last updated:** [July 4, 2024, 1:26am UTC](https://community.bitmovin.com/t/playback-issue-with-ffmpeg-generated-hls-stream-using-fmp4-segments-on-chrome-edge/3053 "2024-07-04T01:26:31Z")

</div>

Product Player Question Hi All, We’re trying to play an ffmpeg generated HLS stream on the latest Bitmovin player. All the settings used in ffmpeg are pretty standard: single bitrate, single media manifest file, fmp4 s…

---

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

<div class="topic-metadata">

**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")

</div>

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…

---

## [Fmp4 muxing with mp3 files not generating correct HLS master file](https://community.bitmovin.com/t/fmp4-muxing-with-mp3-files-not-generating-correct-hls-master-file/1684)

<div class="topic-metadata">

**Author:** [@shubham.aggarwal](https://community.bitmovin.com/u/shubham.aggarwal)\
**Replies:** 1\
**Last updated:** [February 10, 2023, 3:42pm UTC](https://community.bitmovin.com/t/fmp4-muxing-with-mp3-files-not-generating-correct-hls-master-file/1684 "2023-02-10T15:42:56Z")

</div>

On encoding mp3 content with fmp4, the master HLS file is shown below. #EXTM3U #EXT-X-INDEPENDENT-SEGMENTS #EXT-X-VERSION:4 #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio",NAME="HLS Audio Media",LANGUAGE="en",AUTOSELECT=YES,UR…

---

## [Modifying MP4 segments Bitmovin Player Client-Side](https://community.bitmovin.com/t/modifying-mp4-segments-bitmovin-player-client-side/1393)

<div class="topic-metadata">

**Author:** [@seven](https://community.bitmovin.com/u/seven)\
**Replies:** 0\
**Last updated:** [October 13, 2022, 6:50am UTC](https://community.bitmovin.com/t/modifying-mp4-segments-bitmovin-player-client-side/1393 "2022-10-13T06:50:23Z")

</div>

Background You might notice your Stream plays on 80% of devices but fails on 20% of them. i.e typical 80-20 rule. Particularly on Live Streams. In Bitmovin we’ve seen older devices making the bulk of this 20% devices. F…

---

## [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)

<div class="topic-metadata">

**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")

</div>

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?