BTW, What is ffmpeg?įFmpeg is a free, open-source software composed of a large set of libraries and programs that manage images, audio, and other multimedia files and streams. We used the -avoid_negative_ts make_zero parameter. Here we use ffmpeg to cut the video in.mp4 from second 8 to second 47. One example would be ffmpeg -i "in.mp4" -ss 00:00:08 -to 00:00:37 -c copy -avoid_negative_ts make_zero "out.mp4". Is there any example of using ffmpeg to cut video? When you use ffmpeg to cut videos and use copy mode, ffmpeg will have all frames before and after the trimmed frame that are needed to correctly decode the file. The deeper reason is that the codecs most videos are using have temporal compression, so the time you specified may lie on frames before and after that timepoint to be correctly decoded. What it is doing here is to shift the timestamp of the video to 0. Here we pass make_zero to avoid_negative_ts. You can use -avoid_negative_ts make_zero. Reference: How to avoid the black screen at the beginning? i specified the input video file and its position actually matters. You can put -i before -ss and -to parameters. How to have the correct length at the end? Long story short, you can try the following 2 methods: In this FAQ, I will answer the two questions you might have in the paragraph above in an easy but extensive way: how to have the correct length in the output cut video and how to avoid having a black screen in the beginning so you have a better watching experience.
You might also notice the length is not quite right: it should be shorter but the video cut ends up with an undesired length.
However, after running a few of them, you may find that in the video there is a black screen in the beginning or you can click the last part of the video to see the end of it. There are a lot of StackOverflow questions and answers about how to cut videos with ffmpeg. ffmpeg is a versatile tool that can virtually do anything with videos files in any codec but this also makes it very hard to master, even for small use cases such as cutting videos. The webm extension will be removed and replaced by the mp3 extension e.g hi.webm will become hi.If you are using Ubuntu 18.04 or 20.04, you might want to use ffmpeg to cut your video that is too long and you are only interested in a part of it for a presentation or sent it to a friend or Reddit. The filename of the audio file will be the same as the webm video with the correct extension. MP3 audio file you can execute the following: FILE="the-file-you-want-to-process.webm" įfmpeg -i "$' \ If you need to extract the audio from an. 22 December 2014 in Bash tagged audio / extract / ffmpeg / mp3 / video / webm by Tux
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