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How can I extract a good quality JPEG image from a video file with ffmpeg?
...be console output can tell you if your input is MJPEG:
$ ffprobe -v error -select_streams v:0 -show_entries stream=codec_name -of default=nw=1 input.avi
codec_name=mjpeg
Then you can extract the frames using the mjpeg2jpeg bitstream filter:
$ ffmpeg -i input.avi -codec:v copy -bsf:v mjpeg2jpeg outp...
How to fix the Hibernate “object references an unsaved transient instance - save the transient insta
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For merge, it runs a SELECT query. Otherwise, it checks the id and the version.
– Vlad Mihalcea
Sep 4 at 3:46
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Do checkbox inputs only post data if they're checked?
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Workaround: use <select>with two options on and off :-)
– andy
May 23 '18 at 9:26
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Windows threading: _beginthread vs _beginthreadex vs CreateThread C++
...it can be done. But yeah, it ain't bloody likely for almost all but a very select few.
– WhozCraig
Sep 3 '12 at 7:24
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Get TransactionScope to work with async / await
...y project from 4.5 to 4.5.1 by right clicking on project go to properties. Select application tab change target framework to 4.5.1 and use transaction as follow.
using (AccountServiceClient client = new AccountServiceClient())
using (TransactionScope scope = new TransactionScope(TransactionScopeAsy...
How to push new branch without history
...epository settings>add.
I closed that, and clicked on the push button
I selected my new 'clean-ver' branch said ok.
When I checked bitbucket, it seems that this seemed to have worked and discarded my commit history.
Hope this helps someone out.
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Find kth smallest element in a binary search tree in Optimum way
... tree, your algorithm will take O(n) time to finish, which is bad for the selected answer-O(log n)
– Spark8006
Jul 2 '15 at 14:58
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Finding all cycles in a directed graph
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This answer is much better than the answer selected. I struggled for quite a while trying to figure out how to get all simple cycles from the strongly connected components. It turns out this is non-trivial. The paper by Johnson contains a great algorithm, but is a lit...
How to submit a form with JavaScript by clicking a link?
... went for the simple answer. What I personally do is use href="#" and then select all those links with jquery and call e.preventDefault() in the click event handler so the browser doesn't scroll.
– Maurice
Mar 20 '14 at 14:44
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django: BooleanField, how to set the default value to true?
...ou want to dynamically choose at runtime whether or not your field will be selected by default, you can use the initial parameter to the form when you initialize it:
form = MyForm(initial={'my_field':True})
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