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What is H264?

Raw H.264/AVC is an elementary stream of H.264 encoded video data without container overhead, used in video analysis.

What is HEVC?

Raw H.265/HEVC is an elementary stream of High Efficiency Video Coding data, doubling compression efficiency over H.264.

When Should You Use H264 vs HEVC?

Use H264 When...

Reach for H264 when your priority is video codec analysis, raw encoded streams — its efficient compression makes sharing fast and storage minimal.

Use HEVC When...

Reach for HEVC when your priority is high-efficiency video encoding, 4k/8k streams — its efficient compression makes sharing fast and storage minimal.

H264 vs HEVC: Key Differences

  • •H264 and HEVC diverge on compression: lossy compression for the source, lossy compression for the target.
  • •Since both H264 and HEVC use lossy compression, the quality characteristics are comparable — differences in file size come down to how efficiently each format implements compression.
  • •How transparency is handled: HEVC does not support alpha channels — transparent areas in the source will become opaque.
  • •File sizes: H264 files typically range Much smaller than uncompressed video and HEVC files 50% smaller than H.264 at same quality.
  • •H264 is optimized for video codec analysis, raw encoded streams while HEVC is designed for high-efficiency video encoding, 4k/8k streams — choose based on your specific workflow needs

Advantages of H264

  • ✓At its core, H264 relies on lossy encoding — a design choice that makes it perfect for Video codec analysis, raw encoded streams.
  • ✓You won't run into compatibility issues with H264 — it's a universal standard across platforms.
  • ✓File size management with H264: aggressive compression with minimal visible quality loss.
  • ✓Every major application in the Video codec analysis, raw encoded streams space supports H264 natively.

Advantages of HEVC

  • ✓At its core, HEVC relies on lossy encoding — a design choice that makes it perfect for High-efficiency video encoding, 4K/8K streams.
  • ✓You won't run into compatibility issues with HEVC — it's a universal standard across platforms.
  • ✓File size management with HEVC: aggressive compression with minimal visible quality loss.
  • ✓Every major application in the High-efficiency video encoding, 4K/8K streams space supports HEVC natively.

Common Use Cases for H264 to HEVC Conversion

  • Professional video editing
  • Social media content
  • Security and surveillance
  • Educational content
  • Marketing videos
  • Video archiving

Industry Applications

Film ProductionSocial MediaVideo StreamingE-learningMarketingBroadcast Media

Best Practices for H264 to HEVC Conversion

  • →Converting H264 to HEVC: match the output resolution and bitrate to your target platform's requirements
  • →HEVC offers efficient streaming-optimized compression — ideal for online delivery
  • →Use appropriate bitrate for the balance of quality and file size
  • →HEVC is a lossy format, so expect some quality loss at higher compression ratios
  • →Always keep a backup of your original files before converting
  • →Choose the appropriate quality settings for your specific use case

Related Article

Video Compression Guide: Reduce File Size Without Losing Quality

Learn more about H264 and HEVC formats in our detailed guide.

Troubleshooting H264 to HEVC Conversion

  • !HEVC won't play on target device → check codec compatibility (H.264 has broadest support)
  • !Audio out of sync after H264 to HEVC conversion → try re-muxing with a different container format
  • !HEVC quality is too low → increase the bitrate; for 1080p video, 8-15 Mbps is recommended
  • !File size increased converting H264 to HEVC → lossless or higher-bitrate outputs naturally produce larger files

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About H264 and HEVC

H264

H264 (H.264 streams) - Raw H.264/AVC, elementary stream of AVC encoded video. Best for video codec analysis, raw encoded streams.

HEVC

HEVC (HEVC streams) - Raw H.265/HEVC, elementary stream of HEVC encoded video. Ideal for high-efficiency video encoding, 4k/8k streams.

Format Comparison

CompressionLossy → Lossy
TransparencyN/A
Use CaseConvert from video codec analysis, raw encoded streams to high-efficiency video encoding, 4k/8k streams
File Size~50% smaller than H.264 at same quality after conversion

FAQs

Is converting H264 to HEVC free?

Yes, GoConvertFile offers free conversion of H264 to HEVC for files up to 100MB. No registration required.

How long does it take to convert H264 to HEVC?

Most H264 to HEVC conversions complete within seconds for standard-sized files. Larger files may take longer depending on the conversion complexity.

What is HEVC best used for?

HEVC is ideal for high-efficiency video encoding, 4k/8k streams. Raw H.265/HEVC, elementary stream of HEVC encoded video

What file size should I expect after converting H264 to HEVC?

File size after H264 to HEVC conversion depends on the content complexity and quality settings. Both formats use similar compression approaches so sizes are comparable.

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