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How can I efficiently trim XX seconds from the beginning and XX seconds from the end of a video using free online tools?

The "ffmpeg" tool is a powerful, open-source multimedia framework that can be used for a variety of tasks, including video trimming.

The "-ss" option in ffmpeg allows you to specify the start time of the video from where you want to start playing the video.

The "-t" option in ffmpeg allows you to specify the duration of the video until where you want to play the video.

By using the "-ss" and "-t" options in combination, you can trim a video from both the start and end.

The keyframe interval in a video determines the frequency of keyframes, which are used by video players to decode the video.

If the keyframe interval is too large, it can result in black frames at the beginning or end of a trimmed video.

The format for specifying time in ffmpeg is "hh:mm:ss.ms", where "hh" represents hours, "mm" represents minutes, "ss" represents seconds, and "ms" represents milliseconds.

The "vcodec" and "acodec" options in ffmpeg are used to specify the video and audio codecs, respectively.

If the input video file has variable frame rate (VFR), using "-c:v copy" and "-c:a copy" options may result in audio and video desynchronization.

In such cases, you might need to re-encode the video.

FFmpeg supports a wide variety of input and output formats, including AVI, MP4, MOV, FLV, MPEG, and many more.

FFmpeg can be used to extract frames from a video using the "-ss" and "-vframes" options.

FFmpeg can be used to merge multiple videos into a single video using the "-i" option followed by the input files and "-filter\_complex" option followed by the filter to merge the videos.

FFmpeg can be used to extract audio from a video using the "-vn" option along with the "-acodec" option to specify the output audio codec.

FFmpeg can be used to speed up or slow down a video using the "-filter:v" option followed by the "setpts" filter.

FFmpeg can be used to crop a video using the "-filter:v" option followed by the "crop" filter.

FFmpeg can be used to resize a video using the "-vf" option followed by the "scale" filter.

FFmpeg can be used to add a watermark to a video using the "-vf" option followed by the "overlay" filter.

FFmpeg can be used to convert a video to grayscale using the "-vf" option followed by the "format" filter.

FFmpeg can be used to add subtitles to a video using the "-vf" option followed by the "subtitles" filter.

FFmpeg can be used to change the volume of a video using the "-af" option followed by the "volume" filter.

FFmpeg can be used to change the aspect ratio of a video using the "-vf" option followed by the "setdar" filter.

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