To resolve this issue, try VLC media player. MP4 is a container that contains various kinds of data, so when there is a problem opening the file, it usually means that data in the container (an audio or video codec) is not compatible with the device’s OS. On some devices, particularly mobile, opening this file type can be problematic. On Windows, it opens in Windows Media Player. There is no need for third-party software. Import a video Launch the best alternative to FFmpeg when you intend to crop a video or videos. Simply double-clicking the file opens it. To crop 200 pixels from the input video height ( ih ), meaning to crop 100 pixels from the top and 100 pixels from the bottom, and crop 100 pixels from the input video width ( iw ), meaning to crop 50 pixels from the left and 50 pixels from the right: ffmpeg -i input.mp4 filter:v 'cropiw-100:ih-200' output.mp4.
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