How do I convert videos for web and mobile playback compatibility?

To convert videos for web and mobile playback compatibility, you generally want to encode them in a widely supported container + codec combination with sensible bitrate/resolution settings.

Best formats to use

For broad compatibility

• MP4 container
• H.264 video
• AAC audio

This is the safest choice for:

• browsers
• iPhones/iPads
• Android devices
• most smart TVs and media players

For newer, smaller files

• WebM container
• VP9 or AV1 video
• Opus audio

This can be good for modern browsers, but compatibility is not as universal as MP4/H.264.

Recommended settings for web/mobile

Video

• Codec: H.264
• Profile: Main or High
• Level: auto or appropriate for resolution
• Resolution: 720p or 1080p depending on source/needs
• Frame rate: keep original if possible
• Bitrate: around 2–8 Mbps depending on resolution and quality

Audio

• Codec: AAC
• Sample rate: 44.1 kHz or 48 kHz
• Bitrate: 128–192 kbps stereo

Using FFmpeg

FFmpeg is the most common tool for conversion.

Basic MP4 conversion

ffmpeg -i input.mov -c:v libx264 -preset medium -crf 23 -c:a aac -b:a 128k output.mp4

More web-friendly MP4 with fast start

This moves metadata to the beginning so playback can start before the file fully downloads:

ffmpeg -i input.mov -c:v libx264 -preset medium -crf 23 -c:a aac -b:a 128k -movflags +faststart output.mp4

Resize to 720p while preserving aspect ratio

ffmpeg -i input.mov -vf "scale=-2:720" -c:v libx264 -crf 23 -c:a aac -b:a 128k -movflags +faststart output.mp4

For adaptive streaming

If you need smooth playback across different network speeds, convert videos into HLS or DASH:

• HLS is especially common for Apple devices and web streaming
• DASH is widely used on the web

These usually involve:

• splitting video into chunks
• creating playlists/manifest files
• encoding multiple quality levels

Important compatibility tips

• Avoid uncommon codecs like WMV, RMVB, or older MPEG variants for web/mobile
• Keep filenames simple
• Use H.264 + AAC in MP4 if you want the highest chance of working everywhere
• For Safari/iPhone compatibility, MP4/H.264 is especially important
• Ensure the video is progressive scan rather than interlaced if possible

Quick recommendation

If you just want one file that works almost everywhere:

• MP4
• H.264
• AAC
• faststart enabled

If you want, I can also give you:

1. a one-line FFmpeg command for your exact source file, or
2. a preset conversion recipe for YouTube/web/mobile/social media.