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Old 23rd January 2022, 17:32   #1  |  Link
mike23
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Join Date: May 2003
Posts: 107
Diff Rate Controls Modes for MPEG-4 AVC H.264 with/without Intel Quick Sync

When I try to re-encode a video into a MP4 container (with XMedia Recode) I have the choice between

MPEG-4 AVC H.264
and
MPEG-4 AVC H.264 (Intel quick sync)

Surprisingly both codecs have some different Bitrate Control Modes:

MPEG-4 AVC H.264:
- ABR (Average Bitrate)
- 2-pass ABR (2-pass average bitrate)
......

MPEG-4 AVC H.264 (Intel Quick Sync):
- ABR (average bitrate)
- VBR (variable bitrate)
- ICQ (Intelligent constant quality)
.....


Why is there no 2-pass encoding for the second encoding but only for the first?

Whats the difference between ABR and VBR?

Which Bitrate Control Mode is the best for MPEG-4 AVC H.264 (Intel Quick Sync)?

Last edited by mike23; 23rd January 2022 at 20:31.
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Old 24th January 2022, 03:02   #2  |  Link
benwaggoner
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Location: Portland, OR
Posts: 4,750
I imagine the first option uses the x264 software encoder, which provides higher quality and a lot more flexibility.

For QuickSync, ICQ is supposed to provide the best quality @ bitrate, but I've not messed with it in ages. Modern computers can encode x264 so quickly that messing with HW H.264 is rarely useful outside of live game streaming.
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