What video formats support Xiaomi Redmi 9: a full guide to compatibility

Xiaomi Redmi 9 is one of the most popular budget smartphones, but its video playback capabilities often remain a mystery to users: Did you download a movie in high resolution and it doesn't open? Or does video slow down even though it plays perfectly on your computer? The problem lies in supported formats and codecs. In this article, we will discuss in detail which video formats are compatible with Redmi 9, how to check them on your device and what to do if the file is not played.

The phone is equipped with a MediaTek Helio G80 processor and a ARM Mali-G52 MC2 video chip, which imposes certain limitations on video decoding. For example, the Redmi 9 does not support hardware acceleration for some codecs, which makes the 4K- video in the H.265 format playable with jerks. We tested the device on various file types and made a typical checklist.

Official video formats supported by Xiaomi Redmi 9

The manufacturer claims to support standard formats, but the real picture is more complicated. According to the technical documentation, Redmi 9 must play:

• 🎬 MP4 (H.264, H.265/HEVC, MPEG-4)
• 📽️ MKV (with codec restrictions)
• 🎥 AVI (DivX, XviD, MPEG-4)
• 📼 WMV only WMV9 and below
• 🖥️ MOV (QuickTime, limited)
• 📹 3GP/3G2 (for mobile records)

But that doesn't mean that any file in these formats will work, like MKV with VP9 or AV1 codec won't play without converting, and MOV video with ProRes codec (used in professional editing) won't even open, and it's important to consider not only the file extension, but also its internal structure.

MIUI firmware also affects compatibility. Older versions (below MIUI 12.5) may not have codecs for H.265 at high bitrates. If your Redmi 9 hasn't been updated in a long time, check the software version first in Settings → About Phone → MIUI version.

Supported codecs and their limitations

The codec is an engine that compresses and unpacks video. Redmi 9 supports basic codecs, but with nuances:

Critical note: video in 4K (2160p) on Redmi 9 is played only through software decoding, which leads to overheating and a sharp drop in FPS. If you need to watch 4K- content, it is better to lower the resolution to 1080p or use an external player with optimization, for example VLC or MX Player (with hardware acceleration enabled).

Variable bitrate (VBR) files are particularly problematic. For example, an anime in MKV with H.264 codec and 20+ Mbps bitrate will slow down even if the resolution is just 720p. In such cases, conversion to constant bitrate (CBR) using HandBrake or FFmpeg will help.

⚠️ Warning: If the AVI video with the DivX codec is played without sound, check the audio track. Redmi 9 doesn't support some legacy audio codecs, like AC3 in a AVI- container, the solution is to convert the sound to AAC or MP3.

How to check the compatibility of video on Redmi 9

Before you convert a file, make sure that the problem is in the format.

1. Download the file to your smartphone (for example, via Telegram or File Manager).
2. Try opening it with a standard video player (film icon).
3. If the video is not played, install an alternative player (VLC or MX Player) and try again.
4. If there is an error, check the file information using the MediaInfo app (available on Google Play).

At MediaInfo, pay attention to:

• 📌 Format (e.g. MPEG-4 or Matroska)
• 📌 Video codec (H.264, VP9, etc.)
• 📌 Resolution (e.g. 1920×1080)
• 📌 Bitrate (if above 20 Mbit / s - lags are possible)
• 📌 Audio codec (AAC normally works, DTS does not.

If you see an AV1, VP9 (high resolution) or MPEG-2 codec in MediaInfo, you can guarantee that the file will not play without converting, and the same goes for audio tracks in FLAC or DTS-HD, which you need to recode into AAC or MP3.

Try an alternative player (VLC/MX Player)

Check the codec through MediaInfo

Reduce resolution to 1080p or lower

Convert to MP4 with H.264 codec

Check the audio track (should be) AAC/MP3)-->

Best Players for Video Playback on Redmi 9

The standard video application in MIUI is suitable for basic tasks, but often does not cope with "heavy" files. We tested the 5 popular players and selected the top -3:

1. VLC for Android ✅ Pros: Supports almost all codecs, no ads, open source. ❌ Cons: the interface is overloaded, sometimes slows down when scrolling the timeline.
2. MX Player ✅ Pros: hardware acceleration for H.264/H.265, subtitle support, control gestures. ❌ Cons: in the free version of advertising, some codecs require additional packages.
3. BSPlayer ✅ Pros: lightweight, supports network streams, there is an equalizer of sound. ❌ Cons: outdated design, no Russian language.

For maximum performance in the MX Player, enable hardware decoding:

1. Open the player and press ⋮ → Settings → Decoder.
2. Select Hardware Decoder (or Hardware+ for H.265).
3. In the Renderer section, install Surface or OpenGL.

If the video still slows down, try turning off background playback in the player settings - this will reduce the load on the processor. Also close all background applications through Settings → Applications → Launched to free RAM.

💡

If the video in MKV is played without sound, try renaming the file extension to.MP4. Sometimes this helps the standard MIUI player correctly define the audio track.

Video Conversion for Redmi 9: Step-by-step instructions

If your file is not playing, you need to convert it.

• 🖥️ HandBrake (free, cross-platform)
• 📱 Video Converter Android (for smartphone)
• 🌐 Online-Convert (if you don't want to install software)

The best settings for Redmi 9 in HandBrake:

1. Select Android 1080p30 preset.
2. In the Video section, set: Codec: H.264 (x264) Bitrate: 10–15 Mbit/s (for 1080p) FPS: 30 (if source 60 FPS, reduce)

Audio

AAC

192 kbps

MP4

To convert via smartphone, use the Android Video Converter:

1. Select a file and press Convert.
2. Install: MP4 (H.264) Resolution: 1920×1080 (or lower) Audio codec: AAC

Start

⚠️ Warning: When converting 4K- video to 1080p for Redmi 9, use the Lanczos method (in the HandBrake zoom settings). This will keep the picture sharp despite the resolution decrease. The Bilinear method will give a blurred image.

Frequent problems and their solutions

Even if the format is supported, there can be errors.

• 🔊 Video is, no sound Reason: incompatible audio codec (DTS, AC3, FLAC Solution: convert sound to AAC or MP3 via FFmpeg: ffmpeg -i input.mkv -c:v copy -c:a aac -b:a 192k output.mp4
• ⏳ Video slows down or hangs down The reason: high bitrate (more than 20 Mbit / s) or resolution above 1080p Solution: reduce bitrate to 10-15 Mbit / s or resolution to 720p.
• 🖼️ Green artifacts or ripples on screen Reason: hardware decoding problem H.265 Solution: in the MX Player, disable hardware acceleration for this codec.
• ❌ File not opens entirely The reason: corrupted file or incompatible container (e.g., TS with non-standard tags). Solution: save the file via MKVToolNix or convert to MP4.

If the problem persists, check the integrity of the file, either re-download it or compare the hash amount (e.g., through Hash Droid on Google Play), and the damaged files often don't play even on a PC.

Tips for Optimizing Reproduction

To make the video play smoothly, follow these guidelines:

• 🔋 Charging while browsing: At low battery levels (<20%), the processor limits performance, which can cause lags.
• 📶 Turn off mobile internet: Background sync (like WhatsApp or Mail) steals resources.
• 🧹 Clear the cache: go to Settings → Storage → Cache data and clear it.
• 🔄 Update your firmware: newer versions MIUI have improved codec support. Check for updates in Settings → About Phone → System Update.
• 🎧 Use headphones: Playing sound through speakers increases the load on the processor.

For owners of Redmi 9 root rights, there is an additional way to speed up playback - to turn off the thermal restriction of the processor.

1. Install Kernel Adiutor from Google Play.
2. Go to the CPU section.
3. Turn off Thermal Throttling (if available).
4. Set the maximum frequency for all cores.

⚠️ Warning: Turning off thermal restriction can overheat your smartphone! Use this method only for short-term viewing and monitor the temperature through the AIDA64 app. If you heat above 60°C, stop playing immediately.

💡

For smooth playback of 1080p- video on Redmi 9 optimal bitrate - 8-12 Mbit / s with H.264 codec. Exceeding these values leads to jerks and overheating.

FAQ: Answers to Frequent Questions