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• FFMPEG Credits using png [closed]

  21 août 2023, par Tarek Sawah

  Can I add credits roll-up to a video using a png file and make it show at a certain time and last for 20 seconds ?
I have a 5:30-minute long video file, and I have a PNG file that's 7000 pixels high with transparent background, using ffmpeg, can I make the PNG file slide from bottom to top at a certain second and last for 20 seconds max while making sure it doesn't cover the video file and still have a transparent background ?
I tried creating a credits video and combining it with the original video, but I can't get the transparent background for some reason which is frustrating.
This is the code I used to creat the credits video :

  


  ffmpeg -f lavfi -i color=color=0xff0000@0.0:s=1920x1080,format=rgba -loop 1 -t 0.5 -i "rollup_test.png" -filter_complex "[1:v]colorkey=0xff0000:0.2:0.0,scale=1920:-2,setpts=if(eq(N\,0)\,0\,1+1/0.05/TB),fps=30[fg]; [0:v][fg]overlay=y=-'t*h*0.05':eof_action=endall[v]" -map "[v]" -pix_fmt yuv420p -preset ultrafast -y credits.mp4 


  


• How can I make windows "like" the mp4 files I create in Linux and sync with Rsync

  17 juillet 2019, par Geoff Fox

  I am a meteorologist on TV remotely from a studio I built. My control room uses a TriCaster, an amazing studio-in-a-box which runs on a Windows 7 variant. I make my weather maps myself on a Centos 7 machine — around 40,000/day.

  I don’t entirely understand the problem, but here’s a quote from someone helping me at NewTek (the TriCaster company)

  Rsync is built on a *nix based environment where all the file permissions and attributes are based on the Linux environment. There is no meaning for this in NTFS and Windows. The result is you get files that will most likely have the read-only flag set or no flag at all. Other attributes will be delivered as null. I’m sure from your own programming experience, programs don’t like null values and they generally have to be accounted for very specifically.

  And so the finely tuned TriCaster stumbles, meaning lost frames or other problems caused by my short weather animations.

  Here are some samples of the Rsync code I use

  rsync -r -t -s -v --no-p --chmod=ugo=rwX /var/www/html/output/loops/mp4/conus*.mp4 /mnt/tricaster/Clips/Import
rsync -r -t -s -v --no-p --chmod=ugo=rwX /var/www/html/output/loops/mp4/nebraska*.mp4 /mnt/tricaster/Clips/Import
rsync -r -t -s -v --no-p --chmod=ugo=rwX /var/www/html/output/loops/mp4/northernplains*.mp4 /mnt/tricaster/Clips/Import

  These are mp4 files. They are only used locally. I really don’t care what flags are checked and permissions filled as long as Windows 7 doesn’t care.

  At this point I always like to tell folks, though I do write some code my last computer class was in high school,’67-68 semester. Thanks in advance for your help.

• ffmpeg multiple input video in grid and simultaneous audio

  13 février 2023, par Hnusny Pleb

  i would like to copy a video into n videos in one grid :
best example : https://www.youtube.com/watch?v=lYKDTLGH-TQ&ab_channel=TheRabbit_123

  


  This is my code, its working, but problem is, the audio seems to be like its played by one version.. I want the "echo" thats created by a lot of files like on the video above.

  


  def create_4_in_one(number):
shutil.copy("start.mp4", f"video.mp4")
for i in range(number):
    shutil.copy("video.mp4", f"temp_videa/{i}.mp4")
    subprocess.call(f'ffmpeg -y -i video.mp4 -vf "scale=iw/2:ih/2" -c:a copy video_half.mp4',
                  shell=True)
    subprocess.call(f'ffmpeg -y -i video_half.mp4 -i video_half.mp4 -i video_half.mp4 -i video_half.mp4 -filter_complex "[0:v][1:v]hstack[t];[2:v][3:v]hstack[b];[t][b]vstack[v]; [0:a][1:a][2:a][3:a]amerge=inputs=4[a]" -map "[v]" -map "[a]" -map 0:a -map 1:a -map 2:a -map 3:a -c:a aac -b:a 128k -ac 2 -shortest output.mp4',
                  shell=True)
    os.remove("video.mp4")
    os.remove("video_half.mp4")
    os.rename('output.mp4', 'video.mp4')

os.remove("video.mp4")


  


  Thanks in advance.