> Hi > > I am been trying almost every combination of switches to be able to cut 5 > sec from the start and 5 sec from the ending of variable length mp4 files. > > I have not been successful at doing either. I guess I really don't > understand the usage. I have more than 100 files to do. > > Can anyone suggest a command string that will work? >
read https://www.ffmpeg.org/ffmpeg.html about -ss position and -t duration (input/output) When used as an input option (before -i), limit the duration of data read from the input file so what you really want is a sh script to loop 5 sec fro top is easy cause they all start at 0 so approx something like : and you ffmpeg -i < inFile> -ss 05.000 -vcodec $$ -acodec $$ <outfile> you now have outFile with the top 5 sec off and I think you HAVE to reEncode to trim , or is that just for video filters (-vf) ?????? or can one do -codec copy -acodec copy :: reckon I am not sure - try it so what you really want is a sh script to loop and you have to get the total duration in seconds subtract 5 sec from that start at the top and and your new duration is ( totalSec- 5 sec try some of this ## this is NOT a fuctioning sh script but a sketch a copy & paste from some things I *have done It may help you get started ( or be very wrong ) i think you strat 5 sec deep with a ss- 5 and then you want your duration [ -t ] to be 10 sec less that the running time of the org 5 sec from top and then short another 5 - so as not all the way to end .. #!/bin/bash Src=<yourPathhere> etn=mp4 ### for a file 2.mp4 I get seconds ##ffprobe -i 2.mp4 -show_entries format=duration -v quiet -of csv="p=0" ##yields ##865.365000 ## but maybe you want to take just the whole sec ## so use some awk cd $Src for f in *.$etn ; do durT=$(ffprobe -i $Src/$f -show_entries format=duration -v quiet -of csv="p=0") echo $durT ## get the whole sec NNN of NNN.mmm echo $durT | awk -F'.' '{print $1}' durT1=$(echo $durT | awk -F'.' '{print $1}') echo my sec = $durT1 ## yields a number like so 865 #### durT=$(ffprobe -i $Src/$f -show_entries format=duration -v quiet -of csv="p=0") echo $durT ## get the whole sec NNN of NNN.mmm echo $durT | awk -F'.' '{print $1}' durT1=$(echo $durT | awk -F'.' '{print $1}') echo my sec = $durT1 #####-----------/ do a subtract ..tot time in sec - 10 sec durTless10=$(($durT1 - 600)) echo $durTless10 ## i think is then your -t $durTless10 ffmpeg -ss 5 -i <inFile>${f%.*}.mp4 -t $durTless10 videocodec etc etc <outfileFinal>${f%.*}_short.mp4 done _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
