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Old 23rd January 2022, 17:33   #1  |  Link
mike23
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MPEG-4 AVC H.264 (Intel Quick Sync) not for AVI but only for MP4 videos?

As I found out the

MPEG-4 AVC H.264 (Intel Quick Sync) video codec is only offered for MP4 as target container but not for AVI (at keast not in XMedia Recode).

Is this correct?

I though that video and audio codecs should be independent from video file container

What exactly does Intel Quick Sync mean?
Is this for usage of CPU/GPU built-in firmware feature?
Since which Intel CPU generation is this offered?

Last edited by mike23; 23rd January 2022 at 17:40.
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Old 23rd January 2022, 21:16   #2  |  Link
poisondeathray
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Intel Quick Sync is hardware accelerated decoding and/or encoding since Sandy Bridge generation

Maybe you are using audio incompatible in AVI container ? or Maybe it's a limitation of XMedia Recode

quicksync video encoding works ok with ffmpeg

eg

Code:
ffmpeg -f lavfi -i testsrc2=rate=24000/1001:duration=10:s=640x480 -c:v h264_qsv -an -b:v 1000k test.avi

But why would you want to use AVI container ? There can sometimes be issues with AVC in AVI for some software especially with b-frames; it's less compatible than say MP4 container
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Old 23rd January 2022, 21:29   #3  |  Link
lvqcl
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https://en.wikipedia.org/wiki/Audio_...ve#Limitations
Quote:
  • AVI was not intended to contain video using any compression technique that requires access to future video frame data beyond the current frame (B-frame). Approaches exist to support modern video compression techniques (such as MPEG-4) that rely on this function, although this is beyond the intent of the original specification and may cause problems with playback software which does not anticipate this use.
  • AVI cannot contain some specific types of variable bitrate (VBR) data reliably
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Old 24th January 2022, 03:00   #4  |  Link
benwaggoner
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Yeah, H.264-in-AVI has never been recommended or well supported. Heck, MPEG-4 pt 2 (divx/xvid) wasn't recommended or well supported for .avi either.

AVI is an ancient format that Microsoft has been trying to deprecate for >20 years now, and hasn't been updated since 1996. As lvqcl points out, it predates b-frames.

Why do you want to use it?
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Old 24th January 2022, 07:02   #5  |  Link
mike23
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Ok, thank you.

That means encoding a video into MP4 with the same encoding parameters will result in exactly the same video file no matter whether I use
AVC / H.264
or
AVC / H.264 (Quick Sync)

The only difference is the time required for encoding.

correct?
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Old 24th January 2022, 15:59   #6  |  Link
poisondeathray
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Quote:
Originally Posted by mike23 View Post
Ok, thank you.

That means encoding a video into MP4 with the same encoding parameters will result in exactly the same video file no matter whether I use
AVC / H.264
or
AVC / H.264 (Quick Sync)

The only difference is the time required for encoding.

correct?

Not if the 1st option indicates "CPU" or libx264

You can try it out on a short test
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Old 25th January 2022, 02:29   #7  |  Link
benwaggoner
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Quote:
Originally Posted by mike23 View Post
Ok, thank you.

That means encoding a video into MP4 with the same encoding parameters will result in exactly the same video file no matter whether I use
AVC / H.264
or
AVC / H.264 (Quick Sync)

The only difference is the time required for encoding.

correct?
Probably not. If the first option is x264, it'll probably yield better quality at a given bitrate but take longer to encode. Whether or not that matters depends a ton on what you are trying to do.
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