To force a key frame 5 seconds after the time of the last forced one, starting from second 13: -force_key_frames expr:if(isnan(prev_forced_t),gte(t,13),gte(t,prev_forced_t+5)) source If the argument is source, ffmpeg will force a key frame if the current frame being encoded...
it is "NAN" when no keyframe was forced yet t the time of the current processed frame For example to force a key frame every 5 seconds, you can specify: -force_key_frames expr:gte(t,n_forced*5) To force a key frame 5 seconds after the time of the last forced one, starting from...
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Examples • Take the first 5 seconds of a clip, and reverse it. atrim=end=5,areverse asetnsamples Set the number of samples per each output audio frame. The last output packet may contain a different number of samples, as the filter will flush all the remaining samples when the ...
For example, I have a 3 minute video file. I am going to divide it into two parts using the following command. The first part consists of 1 minute 10 seconds from the beginning. The second part will consist remaining (1 minute and 50 seconds), it starts from the end of the last par...
ffmpeg -ss <start time> -i -t <last time> -c copy ffmpeg -ss <start time> -i -to <end time> -c copy Time unit is second, and we can also use format like00:00:00.000, which representshours:minutes:seconds.points.-c copymeans do not change the encoding format of audio ...
String fileName= resourcesPath.substring(resourcesPath.lastIndexOf("\\") +1); command.add(fileName); command.add(resourcesPath); command.add("-x"); command.add(String.valueOf(weight)); command.add("-y"); command.add(String.valueOf(height)); ...
Often, you want to just cut out a portion from a file. FFmpeg supports basic cutting with the-tand-ssoptions. The first one will specify the duration of the output, and the second one will specify the start point. For example, to get the first five seconds, starting from one minute an...
The syntax is quite simple. I specified-t 00:00:30asdurationfor the first part (the first part will consist of the first 30 seconds of the original video). Next, I specified that I’d like the rest to be part of a second video (starting from the end of the last part,00:00:30)...