Video resolution when capturing a full-screen recording via ffmpeg on Mac OS X
I have a 15-inch 2017 MacBook Pro running Mac OS X 10.13 (High Sierra):
The default display supports screen resolutions up to 2880x1800, despite the maximum resolution selectable via the standard UI is limited to 1920x1200 (see this question):
Now, I'm trying to capture a full-screen recording via ffmpeg, using the avfoundation device, in full resolution (i. e. w/o any sub-sampling):
ffmpeg -y -v error -hide_banner -f avfoundation -i 1:none -threads 0 -f mp4 -vcodec mpeg4 -r 25/1 -qscale:v 1 output.mp4
Strangely, when the screen resolution varies between 1024x640 and 1920x1200 (i. e. is selectable via the "scaled list" in the Mac OS X preferences), the size of the resulting video raster is always a quadruple of the screen resolution:
1024x640→2048x1280
- ...
1920x1200→3840x2400
If, on the other hand, I set the screen resolution to the maximum of 2880x1800 using the screenresolution utility, the size of ffmpeg output will be identical to the screen resolution.
In both cases, the -video_size option will be ignored by ffmpeg.
The above is only true for the built-in display: for any external displays, screen resolution and captured video resolution are always the same, regardless of the scale level.
Questions:
- Why does
ffmpeg(or, rather, theavfoundationinput device) exhibit such inconsistencies? - How do I force
ffmpegto always use the current display resolution when capturing the screen? I would rather not enable sub-sampling (-vf scale=...) to affect the resulting raster size.
video ffmpeg resolution macos-highsierra screen-recorder
asked Jan 9 at 12:44
BassBass
454614
add a comment |
I have a 15-inch 2017 MacBook Pro running Mac OS X 10.13 (High Sierra):
The default display supports screen resolutions up to 2880x1800, despite the maximum resolution selectable via the standard UI is limited to 1920x1200 (see this question):
Now, I'm trying to capture a full-screen recording via ffmpeg, using the avfoundation device, in full resolution (i. e. w/o any sub-sampling):
ffmpeg -y -v error -hide_banner -f avfoundation -i 1:none -threads 0 -f mp4 -vcodec mpeg4 -r 25/1 -qscale:v 1 output.mp4
Strangely, when the screen resolution varies between 1024x640 and 1920x1200 (i. e. is selectable via the "scaled list" in the Mac OS X preferences), the size of the resulting video raster is always a quadruple of the screen resolution:
1024x640→2048x1280
- ...
1920x1200→3840x2400
If, on the other hand, I set the screen resolution to the maximum of 2880x1800 using the screenresolution utility, the size of ffmpeg output will be identical to the screen resolution.
In both cases, the -video_size option will be ignored by ffmpeg.
The above is only true for the built-in display: for any external displays, screen resolution and captured video resolution are always the same, regardless of the scale level.
Questions:
- Why does
ffmpeg(or, rather, theavfoundationinput device) exhibit such inconsistencies? - How do I force
ffmpegto always use the current display resolution when capturing the screen? I would rather not enable sub-sampling (-vf scale=...) to affect the resulting raster size.
video ffmpeg resolution macos-highsierra screen-recorder
asked Jan 9 at 12:44
BassBass
454614
add a comment |
I have a 15-inch 2017 MacBook Pro running Mac OS X 10.13 (High Sierra):
The default display supports screen resolutions up to 2880x1800, despite the maximum resolution selectable via the standard UI is limited to 1920x1200 (see this question):
Now, I'm trying to capture a full-screen recording via ffmpeg, using the avfoundation device, in full resolution (i. e. w/o any sub-sampling):
ffmpeg -y -v error -hide_banner -f avfoundation -i 1:none -threads 0 -f mp4 -vcodec mpeg4 -r 25/1 -qscale:v 1 output.mp4
Strangely, when the screen resolution varies between 1024x640 and 1920x1200 (i. e. is selectable via the "scaled list" in the Mac OS X preferences), the size of the resulting video raster is always a quadruple of the screen resolution:
1024x640→2048x1280
- ...
1920x1200→3840x2400
If, on the other hand, I set the screen resolution to the maximum of 2880x1800 using the screenresolution utility, the size of ffmpeg output will be identical to the screen resolution.
In both cases, the -video_size option will be ignored by ffmpeg.
The above is only true for the built-in display: for any external displays, screen resolution and captured video resolution are always the same, regardless of the scale level.
Questions:
- Why does
ffmpeg(or, rather, theavfoundationinput device) exhibit such inconsistencies? - How do I force
ffmpegto always use the current display resolution when capturing the screen? I would rather not enable sub-sampling (-vf scale=...) to affect the resulting raster size.
video ffmpeg resolution macos-highsierra screen-recorder
asked Jan 9 at 12:44
BassBass
454614
I have a 15-inch 2017 MacBook Pro running Mac OS X 10.13 (High Sierra):
The default display supports screen resolutions up to 2880x1800, despite the maximum resolution selectable via the standard UI is limited to 1920x1200 (see this question):
Now, I'm trying to capture a full-screen recording via ffmpeg, using the avfoundation device, in full resolution (i. e. w/o any sub-sampling):
ffmpeg -y -v error -hide_banner -f avfoundation -i 1:none -threads 0 -f mp4 -vcodec mpeg4 -r 25/1 -qscale:v 1 output.mp4
Strangely, when the screen resolution varies between 1024x640 and 1920x1200 (i. e. is selectable via the "scaled list" in the Mac OS X preferences), the size of the resulting video raster is always a quadruple of the screen resolution:
1024x640→2048x1280
- ...
1920x1200→3840x2400
If, on the other hand, I set the screen resolution to the maximum of 2880x1800 using the screenresolution utility, the size of ffmpeg output will be identical to the screen resolution.
In both cases, the -video_size option will be ignored by ffmpeg.
The above is only true for the built-in display: for any external displays, screen resolution and captured video resolution are always the same, regardless of the scale level.
Questions:
- Why does
ffmpeg(or, rather, theavfoundationinput device) exhibit such inconsistencies? - How do I force
ffmpegto always use the current display resolution when capturing the screen? I would rather not enable sub-sampling (-vf scale=...) to affect the resulting raster size.
video ffmpeg resolution macos-highsierra screen-recorder
video ffmpeg resolution macos-highsierra screen-recorder
asked Jan 9 at 12:44
BassBass
454614
asked Jan 9 at 12:44
BassBass
454614
asked Jan 9 at 12:44
BassBass
454614
asked Jan 9 at 12:44
BassBass
454614
asked Jan 9 at 12:44
BassBass
454614
454614
add a comment |
add a comment |
1 Answer
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This appears to be a known ffmpeg issue: Should retain pixel density metadata from HiDPI/Retina screen recordings.
answered Jan 10 at 7:45
BassBass
454614
add a comment |
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This appears to be a known ffmpeg issue: Should retain pixel density metadata from HiDPI/Retina screen recordings.
answered Jan 10 at 7:45
BassBass
454614
add a comment |
This appears to be a known ffmpeg issue: Should retain pixel density metadata from HiDPI/Retina screen recordings.
answered Jan 10 at 7:45
BassBass
454614
add a comment |
This appears to be a known ffmpeg issue: Should retain pixel density metadata from HiDPI/Retina screen recordings.
answered Jan 10 at 7:45
BassBass
454614
This appears to be a known ffmpeg issue: Should retain pixel density metadata from HiDPI/Retina screen recordings.
answered Jan 10 at 7:45
BassBass
454614
answered Jan 10 at 7:45
BassBass
454614
answered Jan 10 at 7:45
BassBass
454614
answered Jan 10 at 7:45
BassBass
454614
454614
add a comment |
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