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• ffmpeg - put video atop of second and center it while keeping aspect ratio

  25 août 2022, par artolini

  I'm trying to put 16:9 video atop of same blurred 1:1 video just like on the photos.
I'm looking a wise guy with ffmpeg knowledge to help me with think of about the command which will :

  


  

  1. rescale 16:9 (sharp video) accordingly to blurred one height (keeping the width automatically to ratio)

  


  2. center the 16:9 (sharp video) to x position = (blurredVideoWidth / 2) - (sharpVideoWidth / 2)

  


  


  My current comment looks like this :

  


  ffmpeg -y -i ${squareBlurredVideoUri} -i ${square169VideoUri} -filter_complex "[1:v]scale=620:-1[v2];[0:v][v2]overlay=0:0" -codec:a copy ${squareFinalVideoUri}

  


  As you can see scale is hardcoded to 620 which is wrong because we should rescale it accordingly to blurred video height.

  


  Overlay is set to 0:0 which places sharp video to x = 0 and y = 0 and should center it

  


  Thank you in advance.

  


  Current result :

Desired result :


  


• ffmpeg does not work with a large number of urls in the request

  2 avril 2023, par Hack team

  If i put one url in the array, everything works perfectly, but when i add more than one url to the array, it throws an error :

  


  HTTP error 403 Forbidden https://p16-sign-sg.tiktokcdn.com/tos-alisg-i-photomode-sg/2c182489bc4e42dcbb70f37a283cf5f1~tplv-photomode-image.jpeg?from=photomode.AWEME_DETAIL&x-expires=1681740000&x-signature=BaB75chVtpoZg6sE%2B0oWmxtzky0%3D https://p16-sign-sg.tiktokcdn.com/tos-alisg-i-photomode-sg/34cae24dad35476d96d8db03b46076b9~tplv-photomode-image.jpeg?from=photomode.AWEME_DETAIL&x-expires=1681740000&x-signature=RTyGbq%2BfLz3hNahtLJyaWycQtPI%3D: Server returned 403 Forbidden (access denied)


  


  However, if i put each of the urls one by one, then access is available and everything works perfectly

  


  It feels like ffmpeg makes one out of three urls and catches an error because of it. But I don't understand how to handle urls.

  


  My code :

  


  from PIL import Image
from io import BytesIO

import requests
import ffmpeg

def make_even(n):
    return n + n % 2

list_of_urls = [
    "https://p16-sign-sg.tiktokcdn.com/tos-alisg-i-photomode-sg/2c182489bc4e42dcbb70f37a283cf5f1~tplv-photomode-image.jpeg?from=photomode.AWEME_DETAIL&x-expires=1681740000&x-signature=BaB75chVtpoZg6sE%2B0oWmxtzky0%3D",
    "https://p16-sign-sg.tiktokcdn.com/tos-alisg-i-photomode-sg/34cae24dad35476d96d8db03b46076b9~tplv-photomode-image.jpeg?from=photomode.AWEME_DETAIL&x-expires=1681740000&x-signature=RTyGbq%2BfLz3hNahtLJyaWycQtPI%3D",
    "https://p16-sign-sg.tiktokcdn.com/tos-alisg-i-photomode-sg/c2cb000f9332498caf6bd837f42e92c6~tplv-photomode-image.jpeg?from=photomode.AWEME_DETAIL&x-expires=1681740000&x-signature=4Zh5PFWNUYQhxQHuKM7P8rk8geU%3D"
]

response = requests.get(list_of_urls\[0\])
img = Image.open(BytesIO(response.content))

width, height = img.size
width = make_even(width)
height = make_even(height)

(
    ffmpeg
    .input(' '.join(list_of_urls), framerate=0.33)
    .filter('scale', width, height)
    .output('output.mp4')
    .run()
)


  


• FFMPEG, want to encode 720x480 and automatically scale to 640x480 or 854x480 as necessary depending on the ratio

  2 décembre 2023, par boxylogan

  EDIT : See appended notes at the bottom of the post.

  


  Note : all MKVs are sourced from my original Farscape Starburst DVDs, MPEG2.
I've been slowly re-encoding my old TV shows into a crisper format and I have for some shows, mainly extras (but also full episodes) MKVs that are a mix of 4:3 and 16:9. Usually I open the files up in Mediainfo and find out which ones are 4:3, stick them in one folder to encode in 640x480, then the same with 16:9. It's worked fine for the umpteen amount of times I've had to encode my shows.
I would like to try to expedite the process with a single FFMPEG command that can automatically detect if the files are 4:3 or 16:9 and encode them properly to 640x480 or 854x480.

  


  My main FFMPEG commands have been these two, depending on which aspect ratio I'm using :

  


  854x480p

  


  `for i in *.mkv; do ffmpeg -i "$i" -c:v libx264 -profile:v main -level:v 4.0 -crf 20 -c:a copy -map 0 -vf scale=854:480,setdar=16/9 encoded/"${i%.mkv}.mkv"; done


  


  640x480p

  


  `for i in *.mkv; do ffmpeg -i "$i" -c:v libx264 -profile:v main -level:v 4.0 -crf 20 -c:a copy -map 0 -vf scale=640:480,setdar=4/3 encoded/"${i%.mkv}.mkv"; done


  


  These two have worked fine lately since I got away from the extraneous -x264-params nonsense I picked up years ago. Again, I'm trying to streamline. I found this command a day ago and it SEEMED to look PERFECT :

  


  `for i in *.mkv; do ffmpeg -i "$i" -c:v libx264 -profile:v main -level:v 4.0 -crf 20 -c:a copy -map 0 -vf scale=w='if(gt(dar,854/480),min(854,iw*sar),2*trunc(iw*sar*oh/ih/2))':h='if(gt(dar,854/480),2*trunc(ih*ow/iw/sar/2),min(480,ih))' encoded/"${i%.mkv}.mkv"; done


  


  Looks perfect and works great for 640x480. The only problem is that it returns 852x480, every time. I even tried a modification I found where you set the setsar=1 AFTER the scale filter, and it does nothing.

  


  These are the first warnings I get when I try to run the command, with a 16:9 video, but it still completes :

  


  `[Parsed_scale_0 @ 0x56299c22fcc0] Circular references detected for width 'if(gt(dar, 854/480), min(854,iw*sar), 2*trunc(iw*sar*oh/ih/2))' and height 'if(gt(dar, 854/480), 2*trunc(ih*ow/iw/sar/2), min(480,ih))' - possibly invalid.
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg2video (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
[Parsed_scale_0 @ 0x56299c20e5c0] Circular references detected for width 'if(gt(dar, 854/480), min(854,iw*sar), 2*trunc(iw*sar*oh/ih/2))' and height 'if(gt(dar, 854/480), 2*trunc(ih*ow/iw/sar/2), min(480,ih))' - possibly invalid.


  


  It encodes and I can see the resolution it outputs to :

  


  `Stream #0:0(eng): Video: h264 (H264 / 0x34363248), yuv420p(tv, top coded first (swapped)), 852x480 [SAR 1:1 DAR 71:40], q=2-31, 29.97 fps, 1k tbn


  


  The next video is a 4:3 video and gives these warnings, however the video still completes, this time the video encodes properly to 640x480 :your text

  


  `[Parsed_scale_0 @ 0x5623084d4140] Circular references detected for width 'if(gt(dar, 854/480), min(854,iw*sar), 2*trunc(iw*sar*oh/ih/2))' and height 'if(gt(dar, 854/480), 2*trunc(ih*ow/iw/sar/2), min(480,ih))' - possibly invalid.
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg2video (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (copy)`your text`
Press [q] to stop, [?] for help
[Parsed_scale_0 @ 0x5623084d7080] Circular references detected for width 'if(gt(dar, 854/480), min(854,iw*sar), 2*trunc(iw*sar*oh/ih/2))' and height 'if(gt(dar, 854/480), 2*trunc(ih*ow/iw/sar/2), min(480,ih))' - possibly invalid.


  


  The output details :

  


  `Stream #0:0(eng): Video: h264 (H264 / 0x34363248), yuv420p(tv, top coded first (swapped)), 640x48 [SAR 1:1 `your text`DAR 4:3], q=2-31, 29.97 fps, 1k tbn


  


  TL ;DR

  


  EDIT : The actual problem is that the command is encoding the 16:9 aspect ratio files to 852x480 instead of 854x480. 854x480 is actually what I would like. 640x480 for the 4:3 is fine. Apologies, for the lack of clarification.

  


  Videos encode (from original Farscape Starburst DVDs MPEG2) properly to libx264 640x480 for 4:3 but not to 854x480 for 16:9. 16:9 instead encodes to 852x480, despite what command is telling it to do.

  


  Advice ? Thanks in advance ! Anything to make my re-encoding a little bit less tedious. I've been googling for hours and searching, but nothing seems to make it click. Thank you again !