Recherche avancée

Sur d’autres sites (8971)

• Concatenate mkv files keeping original timestmap with gaps

  13 août 2020, par Filip

  16 days ago I had this problem : Concatenating mka files but keeping timestamp which I fixed by using amix, a delay by using start_pts from ffprobe.

  


  Today I have a new challenge like this, but with video.

  


  So I have a bunch of mkv videos. Each time a person joins a chat, a mkv is recorded, but if the person refreshes the page a new mkv is created with start_pts and start_time to what it actually is. Also if the meeting started and a person joins after a minute, the start_time is set to 1 minute. I need to merge all those mkv and pad them with blank screen when there is no feed.

  


  Like in the above example, if a person joins after a minute, the first minute is a blank screen. Also if the participant leaves and re-joins after 10 seconds, those 10 seconds are blank again.

  


  Any ideas on how to do that with ffmpeg ?

  


  Concrete example of files :

  


  0PA84c5c3f412769b311d44b159941b2d22.mkv - start_pts: 742 start_time: 0.742000
2PA73d94e8cb0f41c3002fadd6c04b4a88f.mkv - start_pts: 30761 start_time: 30.761000
3PAcd35e470325618fa8a3fb8bb5a41403e.mkv - start_pts: 50940 start_time: 50.940000
4PAddccde7b8847ecc43d5e8643b7903dba.mkv - start_pts: 69243 start_time: 69.243000


  


  The end file would result in a file with length 69.243000, first 0.742 seconds are blank and also the gaps between should also be blank.

  


  So far i've tried :

  


  ffmpeg -i 0PA84c5c3f412769b311d44b159941b2d22.mkv -i 2PA73d94e8cb0f41c3002fadd6c04b4a88f.mkv -i 3PAcd35e470325618fa8a3fb8bb5a41403e.mkv -i 4PAddccde7b8847ecc43d5e8643b7903dba.mkv -filter_complex "[0:v] [1:v] [2:v] [3:v] concat=n=4:v=1 [v]" -map "[v]" test.mkv

  


  This works but without those gaps i mentioned.

  


• Bulk Conversion Of Kubuntu Master Video Folder Using FFmpeg ?

  12 janvier 2019, par Sarah Szabo

  I have an old archive of videos (Around 400GB/1024 files) that are heavily structured due to the program that created them at the time.

  There is a single folder called master that contains many other folders for specific events that were recorded. I was thinking of using for i in *.vob; do ffmpeg -i "$i" "${i%.*}.mp4"; done (From another SO user’s answer on another question), but this is insufficient since the .vob files aren’t all in the master folder are are instead in different folders in master.

  Furthermore, the .vob titles are nonsense (And even worse overlapping ! Video 1 (In Folder 1), Video 1 (In Folder 2) so they can’t all be named the same thing in the same folder if I joined all of them.

  My question is can I do a tree traversal of master using a script (I’m running KDE) that takes each .vob files and converts it using somthing similar to for i in *.vob; do ffmpeg -i "$i" "${i%.*}.mp4"; done in master, but with the name of the folder instead of the name of the file ?

  So, if we were in the Assault On The Control Room folder and converted Video 1 and Video 2, could this output Assault On The Control Room 1 and Assault On The Control Room 2 and move the converted file to /somefilepath/master2 that contains all the converted files ?

  The labels would obviously be set using ffmpeg and a for loop, but my scripting skills aren’t up to this task yet.

  EDIT 0 : Output of shopt -s globstar; for v1 in **/*.vob; do v2=$(awk -F'/' '{print "/somefilepath/master2/" $(NF-1) " - " $NF ".mp4"}' <<< "$v1"); ffmpeg -i "$v1" "$v2"; done

  sarah@ConvergentRefuge:/media/sarah/SENTINEL/Master$ shopt -s globstar; for v1 in **/*.vob; do v2=$(awk -F'/' '{print "/media/sarah/SENTINEL/Videos/NewMaster" $(NF-1) " - " $NF ".mp4"}' <<< "$v1"); ffmpeg -i "$v1" "$v2"; done
 ffmpeg version N-91290-g6129b13 Copyright (c) 2000-2018 the FFmpeg developers
   built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
   configuration: --prefix=/home/sarah/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/sarah/ffmpeg_build/include --extra-ldflags=-L/home/sarah/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/sarah/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
   libavutil      56. 18.102 / 56. 18.102
   libavcodec     58. 20.102 / 58. 20.102
   libavformat    58. 17.100 / 58. 17.100<br />
   libavdevice    58.  4.101 / 58.  4.101<br />
   libavfilter     7. 25.100 /  7. 25.100<br />
   libswscale      5.  2.100 /  5.  2.100<br />
   libswresample   3.  2.100 /  3.  2.100
   libpostproc    55.  2.100 / 55.  2.100
 **/*.vob: No such file or directory
 

  EDIT 1 : View of Master Folder
  

• Is there a way to use InputStream to get the media details

  13 mai 2019, par Naman

  I am currently accepting InputStream from a client of my server for a File uploaded via multipart/form-data.

  I am currently using ffmpeg-cli-wrapper library to use ffprobe and ffmpeg.

  The challenge I see up front is that the APIs exposed by the client doesn’t make use of a stream, rather a mediaPath. Is there a way/library similar to this which can provide me an FFProbe instance as shown in the usage example of the library.

  To add to the pain, I am aware of transforming the InputStream into a file and then passing the mediaPath. But that’s an unnecessary space on my processing disk and an additional step for cleanup as well.