recortar un video desde la linea de comandos

ffmpeg -i input.mp4 -ss 01:10:27 -to 02:18:51 -c:v copy -c:a copy output.mp4

ffmpeg -i uncut.mp4 -ss 00:02:27 -to 00:02:36 -c:v copy cut.mp4 

This will cut out the section from about 1h10min to 2h18min losslessly, and will only take a few seconds to run.
https://www.arj.no/2018/05/18/trimvideo/

Efecto espejo

>ffmpeg -i orig.avi -vf "hflip" flipped.avi

https://corestar.com.au/mirror-video-with-ffmpeg/

subir el volumen de un video
https://desarrollo.espino.info/open-source/dos-excelentes-funciones-de-ffmpeg-subir-volumen-y-recortar-video.html

recombinar un video y audio
https://www.atareao.es/software-linux/mejorar-el-audio-de-un-video/


https://opensourceforu.com/2016/05/cool-ffmpeg-tricks/
https://www.ostechnix.com/20-ffmpeg-commands-beginners/
https://linuxaria.com/howto/tricks-ffmpeg
https://medium.com/@dernis/ffmpeg-tips-tricks-and-and-lessons-learned-a6f3c1187085

Unir 2 videos

FOR MP4 FILES

For .mp4 files (which I obtained from DailyMotion.com: a 50 minute tv episode, downloadable only in three parts, as three .mp4 video files) the following was an effective solution for Windows 7, and does NOT involve re-encoding the files.

I renamed the files (as file1.mp4, file2.mp4, file3.mp4) such that the parts were in the correct order for viewing the complete tv episode.

Then I created a simple batch file (concat.bat), with the following contents:

:: Create File List

echo file file1.mp4 >>  mylist.txt 

echo file file2.mp4 >> mylist.txt

echo file file3.mp4 >> mylist.txt

:: Concatenate Files

ffmpeg -f concat -i mylist.txt -c copy output.mp4

The batch file, and ffmpeg.exe, must both be put in the same folder as the .mp4 files to be joined. Then run the batch file. It will typically take less than ten seconds to run.

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Addendum (2018/10/21) -

If what you were looking for is a method for specifying all the mp4 files in the current folder without a lot of retyping, try this in your Windows batch file instead (MUST include the option -safe 0):

:: Create File List

for %%i in (*.mp4) do echo file '%%i'>> mylist.txt

:: Concatenate Files

ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.mp4

This works on Windows 7, in a batch file. Don't try using it on the command line, because it only works in a batch file!

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2023 comprimir

ffmpeg -i input.mp4 -vcodec libx265 -crf 28 output.mp4

fuente:

https://unix.stackexchange.com/questions/28803/how-can-i-reduce-a-videos-size-with-ffmpeg