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• Installed FFMPEG via pip in virtualenv, but can't find the ffmpeg.exe file

  23 février 2023, par whatwhatwhat

  I created a virtualenv in my project folder, then activated it using the following :

  


  pip install virtualenv
virtualenv venv
venv\Scripts\activate


  


  I then ran pip install ffmpeg. It installed successfully. Now I want to run a python file that needs to know the path of ffmpeg.exe, but when I looked in C:\...\venv\Lib\site-packages\ffmpeg there is no ffmpeg.exe file in there. Where is this EXE file when you work with a virtualenv ? Below is the line where I need to hard-code the path to ffmpeg.exe.

  


  plt.rcParams['animation.ffmpeg_path']='???'


  


• How to find the offset by which the each video must be delayed to sync them perfectly ?

  19 janvier 2023, par PirateApp

  

  


  Let me explain my use case a bit here

  


  


  • We are 4 of us playing the same game

    


  


  • 3 of us recording mkv using OBS studio at 60 fps, 4th guy recording with some other tool at 30 fps

    


  


  • Each mission starts at a cutscene and ends with a cutscene

    


  


  • I would like to create a video like the image you see above starting at ending at the same points but the intermediate stuff is basically what each player is doing in the game

    


  


  • Currently, I follow a process slightly complicated to achieve this and was wondering if there is an easier way to do this

    


  


  • My current process

    


  


  • Take a screenshot from one of the videos of the cutscene

    


  


  


  Run a search for this screen inside the other videos using the command below

  


  ffmpeg 
  -i "video1.mkv"
  -r 1
  -loop 1
  -i 1.png
  -an -filter_complex "blend=difference:shortest=1,blackframe=90:32"
  -f null -


  


  


  • It gives me a result like this in each video

    


    [Parsed_blackframe_1 @ 0x600000c9c000] frame:263438 pblack:91 pts:4390633 t:4390.633000 type:P last_keyframe:263400

    


  


  


  Use the start time from each of the results to create a split screen video using the command below

  


  ffmpeg 
  -i first.mkv
  -i second.mkv
  -i third.mkv
  -i fourth.mp4
  -filter_complex " 
    nullsrc=size=640x360 [base];
    [0:v] trim=start=35.567,setpts=PTS-STARTPTS, scale=320x180 [upperleft]; 
    [1:v] trim=start=21.567,setpts=PTS-STARTPTS, scale=320x180 [upperright];
    [2:v] trim=start=41.233,setpts=PTS-STARTPTS, scale=320x180 [lowerleft]; 
    [3:v] trim=start=142.933333,setpts=PTS-STARTPTS, scale=320x180 [lowerright];
    [0:a] atrim=start=35.567,asetpts=PTS-STARTPTS [outa]; [base][upperleft] overlay=shortest=1 [tmp1];


  


  


  • As you can see, it is a complex process and depends completely a lot on what image I am capturing. Sometimes, I find out that stuff is still slightly off in the beginning or end because the images dont match a 100%. My guess is that the frame rate is different for each video not to mention 3 of them are mkv inputs and one is an mp4 input

    


  


  • Is there a better way to get the offset by how much each video should be moved to sync them perfectly ?

    


  


  • The only way that I can think of is to take 1 video

    


  


  • Take a starting timestamp and an ending timestamp, say with a total duration of 30s

    


  


  • Take the second video

    


  


  • Start from 0 to 30s and compare the frames in both videos, set a score

    


  


  • start from 0.001 to 30.001 and compare the frames, set a score

    


  


  • start from 0.002 to 30.002 and compare the frames, set a score

    


  


  • Basically increment the second video by 0.001 second each time and find out the part with the highest score

    


  


  • Any better way of doing this ? I need to run this on 100s if not 1000s of videos

    


  


  


• (Shell) Strange issue with find loop, skips characters if ffmpeg is introduced. Work around ?

  5 janvier 2023, par Nebarik

  My goal here is to write a simple shell script that finds .ogg files in a folder and then does a little ffmpeg check on them one by one. Seems simple, but I'm running into the weirdest bug where it's randomly dropping 0-5 characters from the begining of the filename causing errors.

  


  I stripped my script down and did some testing with some test files and this is what happens if it's not doing ffmpeg.

  


  find . -type f -name '*.ogg' | while read filename
do
echo "${filename}"
done


  


  ./folder/222.ogg
./folder/111.ogg
./folder/333.ogg


  


  Great, perfect, exactly what I want.

  


  Now if I add ffmpeg as a line AFTER the echo I get this :

  


  find . -type f -name '*.ogg' | while read filename
do
echo "${filename}"
ffmpeg -v error -i "${filename}" -f null - 2>${location}/fferror.log
done


  


  ./folder/222.ogg
older/111.ogg
folder/333.ogg


  


  Some extra testing shows the ffmpeg is getting the messed up filename variables. So it must be the find that's acting different after running ffmpeg. With only 3 files it doesnt seem serious, but I intend to run this on many many files. It's chaos.

  


  Has anyone encountered something like this before ? I've tried adding sleep lines everywhere to troubleshoot, no change (also unsustainable for how many files i have). Any ideas to counter act this strange behaviour and get a clean filename everytime ?