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desktop_ready · 3rd August 2020, 20:19

Hello,

Not sure if this is the right forum.
I have an Intel CPU and I wanted to use hardware acceleration to encode videos in H.264.

Without the hardware acceleration, I am currently having good results with the veryslow preset (which is using CRF 23 I believe):

Code:

ffmpeg -i <input>  -acodec aac -vcodec libx264 -preset veryslow  -y <output>

With the hardware acceleration, I can use:

Code:

ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i <input> -acodec aac -vcodec h264_vaapi  -b:v 6M -y <output>

As you can see, I manually specified the bitrate (6M) which does not result in the same quality as using CRF.

Is there any way I can improve the quality of the results without messing too much with the parameters depending on the video ?

Thanks

3rd August 2020, 20:19	#1 \| Link
desktop_ready Registered User Join Date: Jul 2020 Posts: 2	FFmpeg and h264_vaapi Hello, Not sure if this is the right forum. I have an Intel CPU and I wanted to use hardware acceleration to encode videos in H.264. Without the hardware acceleration, I am currently having good results with the veryslow preset (which is using CRF 23 I believe): Code: ffmpeg -i <input> -acodec aac -vcodec libx264 -preset veryslow -y <output> With the hardware acceleration, I can use: Code: ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i <input> -acodec aac -vcodec h264_vaapi -b:v 6M -y <output> As you can see, I manually specified the bitrate (6M) which does not result in the same quality as using CRF. Is there any way I can improve the quality of the results without messing too much with the parameters depending on the video ? Thanks