AAC vs H264 — Differences, File Size & When to Use Each

AAC vs H264

Ein detaillierter Vergleich von AAC Audio und H.264 Raw Stream — Dateigröße, Qualität, Kompatibilität und welches je nach Workflow zu wählen ist.

H264 → AAC umwandeln

AAC

AAC Audio

Audio Files

AAC is a lossy audio codec that delivers better sound quality than MP3 at similar bitrates. It is the default audio format for Apple Music, YouTube, and most streaming services.

Über AAC-Dateien

H264

H.264 Raw Stream

Video Files

H.264 raw stream is an elementary bitstream containing only the video data encoded with the H.264/AVC codec without any container. It is commonly used as an intermediate format in video processing pipelines and for hardware encoder output.

Über H264-Dateien

Vorteilsvergleich

AAC Vorteile

Better quality than MP3 at equal bitrate — the industry standard since 2000s.
Universally supported on every smartphone, OS, and browser.
Efficient on battery thanks to widespread hardware decoding.
Scales from 8 kbps speech (HE-AACv2) to lossy-transparent 320 kbps.
Five-channel + LFE surround support out of the box.

H264 Vorteile

Universal hardware decode on every device since ~2010.
40-50% smaller than MPEG-2 at equal quality.
Mature ecosystem with dozens of encoders (x264 is the open-source gold standard).
Every browser, phone, TV, and car infotainment supports H.264.
Supports everything from 144p vertical phone video to 8K HDR masters.

Einschränkungen

AAC Einschränkungen

Patent-encumbered — encoders have licensing fees, which is why open alternatives (Opus, Vorbis) exist.
Slightly more complex to encode than MP3.
Raw .aac streams carry no seek index — tooling often prefers M4A/MP4 containers.
Lossy — not suitable for archival or studio production.

H264 Einschränkungen

Patent-encumbered — encoding royalties apply for commercial use.
30-50% larger than H.265/AV1 at equivalent quality.
Raw .h264 bytestreams have no timecode — containers (MP4/MKV) add that.
High profiles decode slowly on pre-2010 hardware.

Technische Spezifikationen

Spezifikation	AAC	H264
MIME type	audio/aac	video/h264
Extensions	.aac, .m4a, .mp4 (container-dependent)	.h264, .264, .avc (raw bytestream)
Standard	ISO/IEC 14496-3	ITU-T Rec. H.264 / ISO/IEC 14496-10 (AVC)
Variants	AAC-LC, HE-AAC, HE-AACv2, AAC-LD, xHE-AAC	—
Sample rates	8-96 kHz	—
Typical containers	—	MP4, MKV, MOV, TS, FLV
Profiles	—	Baseline, Main, High, High 10, High 4:2:2, High 4:4:4

Typische Dateigrößen

AAC

Speech podcast (64 kbps) 1 MB/min
3-min music track (128 kbps) 3 MB
3-min music track (256 kbps) 6 MB
Broadcast-quality 5.1 (384 kbps) 9 MB for 3 min

H264

1080p 30fps @ 5 Mbps (1 min) ~37 MB
4K 60fps @ 35 Mbps (1 min) ~260 MB
HD streaming (1 hour, 6 Mbps) ~2.7 GB

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Häufig gestellte Fragen

AAC (Advanced Audio Coding) is a lossy audio format standardized by ISO as the successor to MP3. It delivers better sound quality than MP3 at equivalent bitrates and is the default audio format for Apple products, YouTube, and most streaming services.

AAC (Advanced Audio Coding) is a com perdas audio formato padrãoized by ISO como o successor to MP3. It delivers better sound quality than MP3 at equivalent bitrates e is the default audio formato para Apple products, YouTube, e most streaming services.

AAC files play in iTunes, Apple Music, VLC, Windows Media Player, and all modern web browsers. AAC is natively supported on iOS, Android, macOS, and Windows.

AAC arquivos reproduzir in iTunes, Apple Music, VLC, Windows Media Player, e all moderno web browsers. AAC is natively suportado no iOS, Android, macOS, e Windows.

AAC is technically superior, offering better quality at the same bitrate. Use AAC for Apple ecosystem and modern devices. Use MP3 only when you need compatibility with very old hardware like legacy car stereos or basic MP3 players.

AAC is technically superior, offering better quality at the same bitrate. usar AAC para Apple ecosystem e dispositivos modernoos. usar MP3 only when you need compatibilidade com very old hardware like legacy car stereos ou basic MP3 players.