Bitrate (VBR)

[Andrasolin]

StaxRip 2417 Qsvenc 769

weird situation when selecting codec 265, this VBR-1 mode works, and when choosing 264, it ignores the specified bitrate and uses the default bitrate

With codec 264, only VBR-2 works With codec 265 both VBR-1/2 work

[Andrasolin]

What is there to understand?

codec 264 ignores the specified bitrate

[quamt]

StaxRip 2417 Qsvenc 769

weird situation when selecting codec 265, this VBR-1 mode works, and when choosing 264, it ignores the specified bitrate and uses the default bitrate

With codec 264, only VBR-2 works With codec 265 both VBR-1/2 work

It seems that the initial information provided wasn’t quite enough to fully understand the issue, which may have led to some confusion. To ensure accurate troubleshooting and resolve the problem efficiently, it's always helpful to provide as much detailed information as possible. This not only avoids misunderstandings but also helps in seeing clearly what might be happening.

For a more accurate diagnosis, please share the following details:

1. System Information:

   • It is important to know the exact GPU model and the driver version being used.
   • Also, knowing the Windows version you're running will be helpful.

2. QSVEnc Hardware and Feature Information:

   • Please run the following commands in the folder where qsvenc.exe is located (open a Windows Command Prompt and navigate to that folder):
     • qsvenc.exe --check-hw
     • qsvenc.exe --check-features Please adjust accordingly to the qsvenc name in that folder.

Share the output of these commands, as they will provide important details about the hardware capabilities and features of the GPU.

3. StaxRip Command Line:
   • StaxRip generates a specific command line for every encode. The full command line is necessary to see exactly how the settings are being passed to QSVEnc.
   • Please share the full command line from StaxRip for the encoding process where this issue occurs.

Providing this information will help in identifying the issue faster and more efficiently.

However, if you're not happy with this response, you are welcome to wait for @rigaya ’s input on the matter.

[rigaya]

--avbr is rather old feature, and it seems to work fine only in old environments with old drivers. For recent environmemts with newer drivers, it is recommended to simply switch to other modes, such as --vbr, --la, --la-hrd, as the problem with --avbr cannot be fixed.

For example, we can get --avbr working fine with Haswell CPUs (4th Gen Core CPUs).

QSVEncC (x64) 7.69 (r3433) by rigaya, Sep  4 2024 09:07:10 (VC 1941/Win)
OS             Windows 10 x64 (19045) [UTF-8]
CPU Info       Intel Core i3-4170 @ 3.70GHz (2C/4T) <Haswell>
GPU Info       Intel HD Graphics 4400 (12EU) 200-1500MHz [54W] (20.19.15.5107)
Media SDK      QuickSyncVideo (hardware encoder) PG, 1st GPU(i), API v1.20

Although it tends to get rather low bitrate than specified, the bitrate is still close to what is specified.

--avbr 4000 -> encoded 3501 frames, 85.97 fps, 3664.32 kbps, 50.98 MB
--avbr 6000 -> encoded 3501 frames, 88.68 fps, 5498.82 kbps, 76.50 MB

But you cannot get this at least after Skylake as long as I have tested, I get way small bitrate whatever I set as you have said suing the same QSVEnc 7.69.

I don't think this can be fixed from the application(QSVEnc) side. As written previously, please simply switch to other modes, such as --vbr, --la, --la-hrd.

[Andrasolin]

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