Lossless Screencast with Audio on Linux

7th April 2020, 09:35

Hi,

i want to create a screencast from a video and tried this command line from here https://trac.ffmpeg.org/wiki/Capture/Desktop

Code:

ffmpeg -video_size 1920x1080 -framerate 25 -f x11grab -i :0.0+100,200 -f pulse -ac 2 -i default output.mkv

This results in a stuttering video after 30sec and there are a lot of error messages in the terminal window. When i try the command line at the end of the side it works better but its video-only

Code:

ffmpeg -video_size 1920x1080 -framerate 25 -f x11grab -i :0.0 -c:v libx264 -crf 0 -preset ultrafast output.mkv

I can't record video and audio together. when i bring audio and video together

Code:

ffmpeg -video_size 1920x1080 -framerate 25 -f x11grab -i :0.0 -c:v libx264 -crf 0 -preset ultrafast -f pulse -ac 2 -i default output.mkv

i have the error

Code:

Unknown decoder 'libx264'

How can i record lossless video with lossless audio?

EDIT
What is the correct framerate in the command line? my computer is connected to the display with displayport running with 75hz. Do i need to capture with 75fps?

Blue_MiSfit · 8th April 2020, 18:35

Move the -i default to before -c:v libx264

7th April 2020, 09:35	#1 \| Link
Habanero2 Guest Posts: n/a	Lossless Screencast with Audio on Linux Hi, i want to create a screencast from a video and tried this command line from here https://trac.ffmpeg.org/wiki/Capture/Desktop Code: ffmpeg -video_size 1920x1080 -framerate 25 -f x11grab -i :0.0+100,200 -f pulse -ac 2 -i default output.mkv This results in a stuttering video after 30sec and there are a lot of error messages in the terminal window. When i try the command line at the end of the side it works better but its video-only Code: ffmpeg -video_size 1920x1080 -framerate 25 -f x11grab -i :0.0 -c:v libx264 -crf 0 -preset ultrafast output.mkv I can't record video and audio together. when i bring audio and video together Code: ffmpeg -video_size 1920x1080 -framerate 25 -f x11grab -i :0.0 -c:v libx264 -crf 0 -preset ultrafast -f pulse -ac 2 -i default output.mkv i have the error Code: Unknown decoder 'libx264' How can i record lossless video with lossless audio? EDIT What is the correct framerate in the command line? my computer is connected to the display with displayport running with 75hz. Do i need to capture with 75fps?

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8th April 2020, 18:35	#2 \| Link
Blue_MiSfit Derek Prestegard IRL Join Date: Nov 2003 Location: Los Angeles Posts: 5,989	Move the -i default to before -c:v libx264