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How can I extract a good quality JPEG image from a video file with ffmpeg?
...put.mp4 -qscale:v 2 output_%03d.jpg
See the image muxer documentation for more options involving image outputs.
To output a single image at ~60 seconds duration:
ffmpeg -ss 60 -i input.mp4 -qscale:v 4 -frames:v 1 output.jpg
This will work with any video input. See below if your input is MJPEG.
MJ...
NSOperation vs Grand Central Dispatch
...ng a custom NSOperation or NSInvocationOperation to do this requires a lot more supporting code. I know that you can use an NSBlockOperation, but you might as well be dispatching something to GCD then. Wrapping this code in blocks inline with related processing in your application leads in my opinio...
How to pass in password to pg_dump?
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Difference between is and as keyword
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cURL equivalent in Node.js?
...nits to request it. But of curse there probably is a way, it just would be more convinient to use one curl like command for this.
– Jānis Gruzis
Jun 3 '14 at 7:50
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Visual Studio displaying errors even if projects build
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Grepping a huge file (80GB) any way to speed it up?
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Some people (not me) like grep -F more than fgrep
– Walter Tross
Jun 18 '14 at 9:21
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Using Gradle to build a jar with dependencies
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Unfortunately this does not work any more. I use gradle 4.10 and the new implementation configuration instead of the now deprecated compile. The above code builds me a small jar without the dependencies. When I change it ( from { configurations.implementation.co...