https://techdoku.nogafam.es/ 2026-05-06T10:29:17+00:00 https://techdoku.nogafam.es/ https://techdoku.nogafam.es/lib/exe/fetch.php?media=wiki:dokuwiki.svg text/html 2020-04-17T22:21:24+00:00 Anonymous (anonymous@undisclosed.example.com) https://techdoku.nogafam.es/doku.php?id=docu:csheet:sysadm:files:compress_vids&rev=1587162084&do=diff Insanely Compress videos using ffmpeg Source: <https://unix.stackexchange.com/questions/28803/how-can-i-reduce-a-videos-size-with-ffmpeg> That answer was written in 2009. Nowadays (2020) a video format much better than H.264 is widely available, namely H.265 (better in that it compresses more for the same quality, or gives higher quality for the same size). To use it, replace the libx264 codec with libx265, and push the compression lever further by increasing the CRF value — add, say, 4 or 6… text/html 2022-04-04T08:11:18+00:00 Anonymous (anonymous@undisclosed.example.com) https://techdoku.nogafam.es/doku.php?id=docu:csheet:sysadm:files:cut_vids&rev=1649059878&do=diff Cut/split videos using ffmpeg ffmpeg -y -i "in.mp4" -ss 00:00:08 -to 00:00:37 -c copy -max_muxing_queue_size 1024 -avoid_negative_ts make_zero "out.mp4" Source: <https://varhowto.com/cut-videos-ffmpeg/> text/html 2020-07-17T16:27:03+00:00 Anonymous (anonymous@undisclosed.example.com) https://techdoku.nogafam.es/doku.php?id=docu:csheet:sysadm:files:ffmpeg_separate_join_audio_video&rev=1595003223&do=diff Separate and join again the audio and video from a file using ffmpeg To remove audio from the video file: ffmpeg -i video.mp4 -c copy -an video.out.mp4 To add audio to the video file again: ffmpeg -i video.mp4 -i audio.wav -c:v copy -c:a aac output.mp4 text/html 2020-08-23T07:09:48+00:00 Anonymous (anonymous@undisclosed.example.com) https://techdoku.nogafam.es/doku.php?id=docu:csheet:sysadm:files:self_signed_cert&rev=1598166588&do=diff Generate a self-signed certificate using openssl In case you want to create a self-signed certificate for your application or reverse proxy, or for whatever other reason, you can do so with just one command openssl req -x509 -nodes -newkey rsa:4096 -keyout key.pem -out cert.pem -days 3650 text/html 2023-04-15T19:48:09+00:00 Anonymous (anonymous@undisclosed.example.com) https://techdoku.nogafam.es/doku.php?id=docu:csheet:sysadm:files:share_ffmpeg_stream&rev=1681588089&do=diff Share an ffmpeg stream over tcp with netcat Sharing an ffmpeg stream over the network can be a very interesting thing to do. From sharing movies at home or your PC monitor, or recording a gameplay remotely. # Snippets # Process a video on the server and play it on the client ## Server: ffmpeg -i "a_video_file.mp4" -f avi pipe:1 | nc -l -p 1234 ## Client nc SERVERIP 1234 | ffplay -fs -i pipe:0 # Share your monitor # If the server has ffmpeg: ## Server: ffmpeg -f fbdev -i /dev/fb0 -f avi pi… text/html 2020-04-04T12:37:42+00:00 Anonymous (anonymous@undisclosed.example.com) https://techdoku.nogafam.es/doku.php?id=docu:csheet:sysadm:files:targz_list&rev=1586003862&do=diff Show contents of a tar.gz file To view a detailed table of contents for archive called my-data.tar.gz, use the following syntax: tar -ztvf my-data.tar.gz tar -tvf my-data.tar.gz tar -tvf my-data.tar.gz 'search-patter'