Re: [FFmpeg-user] Encoding 4K 60Hz lossless from a capture card

[Roger Pack]

You are still performing encoding:

"(native) -> (h264)"

On 12/12/17, Alex Pizzi  wrote:
> Windows 10 64-bit
> Ryzen 7
> GTX 1080
> 32GB RAM
>
> Hi all,
>
> I'm trying to encode 4K 30/60Hz video in a lossless format from a 4K
> capture card and everything I've tried gives me a similar error as in the
> linked image, [real-time buffer too full or near too full frame dropped]
>
> https://cloud.githubusercontent.com/assets/4932401/22171307/ef5c9864-df58-11e6-8821-4b74ce3f32d0.png
>
> This is the command I've tried most recently:
>
> ffmpeg.exe -f dshow -video_size 3840x2160 -framerate 30 -pixel_format bgr24
> -rtbufsize INT_MAX -i video="MZ0380 PCI, Analog 01 Capture" -vf fps=30
> out%d.BMP
>
> With the images dumped to a 10G RAM disk or 850 EVO. I'm doing this to skip
> the encoding step.
>
> I get the same error when encoding with h265 lossless and NVENC h265
> lossless.
>
> I need the video to be lossless as it will be used to test hardware h265
> encoders.
>
> Video source is a 4K Blu-ray.
>
> Any help would be greatly appreciated. Thank you.
>
> -Alex P
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Re: [FFmpeg-user] Encoding 4K 60Hz lossless from a capture card

[Carl Eugen Hoyos]

2017-12-13 3:39 GMT+01:00 Alex Pizzi :

> ffmpeg.exe -f dshow -video_size 3840x2160 -framerate 30 -pixel_format bgr24
> -rtbufsize INT_MAX -i video="MZ0380 PCI, Analog 01 Capture" -vf fps=30
> out%d.BMP

Complete, uncut console output missing.

Do you see the same errors when encoding to "-f null -"?

bmp encoding may not be lossless, hardware encoders do not
support h264 lossless and h265 lossless (afaik).

Carl Eugen
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[FFmpeg-user] Encoding 4K 60Hz lossless from a capture card

[Alex Pizzi]

Windows 10 64-bit
Ryzen 7
GTX 1080
32GB RAM

Hi all,

I'm trying to encode 4K 30/60Hz video in a lossless format from a 4K
capture card and everything I've tried gives me a similar error as in the
linked image, [real-time buffer too full or near too full frame dropped]

https://cloud.githubusercontent.com/assets/4932401/22171307/ef5c9864-df58-11e6-8821-4b74ce3f32d0.png

This is the command I've tried most recently:

ffmpeg.exe -f dshow -video_size 3840x2160 -framerate 30 -pixel_format bgr24
-rtbufsize INT_MAX -i video="MZ0380 PCI, Analog 01 Capture" -vf fps=30
out%d.BMP

With the images dumped to a 10G RAM disk or 850 EVO. I'm doing this to skip
the encoding step.

I get the same error when encoding with h265 lossless and NVENC h265
lossless.

I need the video to be lossless as it will be used to test hardware h265
encoders.

Video source is a 4K Blu-ray.

Any help would be greatly appreciated. Thank you.

-Alex P
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