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How can I extract a good quality JPEG image from a video file with ffmpeg?
...r ffprobe 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 mjpeg2jp...
How can I cast int to enum?
...not a value of your enum), it will actually allow that without throwing an error! Your enum will have that value (2342342) even though it's not a valid choice in the enum itself.
– JoeCool
Jun 25 '13 at 15:14
...
Best way to define private methods for a class in Objective-C
...erate a "MYClass may not respond to '-myPrivateMethod- ", not an exception/error.
– Özgür
Aug 26 '10 at 10:34
2
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How do you get the list of targets in a makefile?
...ure that no commands are executed; 2>/dev/null suppresses the resulting error message. Note: This relies on -p printing the database nonetheless, which is the case as of GNU make 3.82. Sadly, GNU make offers no direct option to just print the database, without also executing the default (or given...
Fast way of finding lines in one file that are not in another?
...check-order (which it seems to do anyway, but this option will cause it to error instead of continue). But to sort the files, simply do: com -23 <(sort file1) <(sort file2) and so on
– michael
Nov 7 '17 at 6:00
...
Proper way to wait for one function to finish before continuing?
...using promises directly (most of the time). If you need to handle catching errors then use it with try/catch. Read about it more here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function .
...
HTML5 record audio to file
...ype || config.type || 'audio/wav';
if (!currCallback) throw new Error('Callback not set');
worker.postMessage({
command: 'exportWAV',
type: type
});
}
worker.onmessage = function(e){
var blob = e.data;
...
How to write to a file in Scala?
...sagree. One should specify the encoding in almost all cases. Most encoding errors I encounter happen because people don't understand or don't think about encoding. They use the default and don't even know it because too many APIs let them get away with it. Nowadays, the most sensible default would p...
How do I add an icon to a mingw-gcc compiled executable?
...k the my.o with MinGW's g++ after windres my.rc my.o (some WinMain-related error message), but the windres my.rc -O coff -o my.res path worked fine.
– Evgeni Sergeev
Oct 22 '14 at 12:48
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How to subtract a day from a date?
...thon datetime object is timezone-aware than you should be careful to avoid errors around DST transitions (or changes in UTC offset for other reasons):
from datetime import datetime, timedelta
from tzlocal import get_localzone # pip install tzlocal
DAY = timedelta(1)
local_tz = get_localzone() # ...