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• FFMPEG syntax clarification question for the "between" function [closed]

  31 octobre 2024, par user2571504

  I've been using a crop filter script to hold the crop in one place for the first 750 frames, then automate a moving crop to follow some action in the clip. It's working great for chunky moves (5 pixel jumps as shown below) :

  


  -filter_script:v:0 crop-filter-script.txt

crop='1500:1000:100:
if(between(n,0,750),100,
if(between(n,751,756),105,
if(between(n,757,762),110,
if(between(n,763,768),115,
if(between(n,769,774),120,
if(between(n,775,780),125,
if(between(n,781,786),130,etc


  


  My question is about how "between" is interpreted. Does "between(n,751,756)" mean "frames 751, 752, 753, 754, 755 & 756" ? or does it exclude the start and ending frames, so that it's "between" those two numbers ? Like : 752, 753, 754 & 755 only ?

  


  Thanks !

  


• Moviepy python images and text with colour background video

  7 janvier, par sjpatel

  I trying to create video like below using Moviepy python.?

  


  Video -
https://assets.json2video.com/examples/marketing/slide-text-right.mp4

  


  Is this possible using Moviepy python ? I can't use FFMPEG because it not supported on my server.

  


  from moviepy.editor import *

# Load the image
img_clip = ImageClip("your_image.png")

# Set the duration of the image clip
img_clip = img_clip.set_duration(5)

# Resize the image if necessary
img_clip = img_clip.resize(height=1080)  # Keep the height consistent

# Define your text
text = "Your Marketing Message"

# Create a TextClip
txt_clip = TextClip(text, fontsize=70, color='white')

# Set the duration of the text clip
txt_clip = txt_clip.set_duration(5)

# Animate the text to slide in from the right
def slide_in(t):
    return 'center', -1000 + 1500 * t  # Adjust these values based on your needs

txt_clip = txt_clip.set_position(slide_in)

# Set background color
txt_clip = txt_clip.on_color(size=(1920, 1080), color=(0, 0, 0), col_opacity=1)

# Position the image on the left side
img_clip = img_clip.set_position(('left', 'center'))

# Position the text clip on the right side
txt_clip = txt_clip.set_position(('right', 'center'))

# Composite the two clips together
final_clip = CompositeVideoClip([img_clip, txt_clip])

# Set the duration of the final clip
final_clip = final_clip.set_duration(5)

# Save the video
final_clip.write_videofile("image_and_slide_text.mp4", fps=24)


  


• FFMPEG : how to create a "title slide" for 3 seconds before a video [closed]

  15 mars 2024, par ashay

  I'm trying to make a lecture video to put online. I have the video itself, and I have a title slide that I'd like to play for 3 seconds before the main video.

  


  I tried using ffmpeg to (1) create a 3 second long video from the title slide and (2) concat the two videos together.

  


  I'm having issues concatenating the videos together — when I do so, the resulting video is much longer than it should be. When I look online, others have similar problems — and this seems to occur when the parameters of the two videos do not match perfectly.

  


  I'd prefer to do this without re-encoding the main video — and it seems this should be possible because I should be able to control what parameters are set for the "lecture slide video".

  


  Here are the commands I've run.
The main video has framerate 25, resolution 1920x1080, and an audio stream at #0:0 and a video stream at #0:1 (according to ffmpeg -i [video].

  


  To create the video of the title slide, I ran ffmpeg -framerate 25 -i lec01_title.png -t 3 -c:v libx264 -x265-params lossless=1 -pix_fmt yuvj420p -vf scale=1920:1080 lec01_title.mp4 -f lavfi -i anullsrc -c:a aac -shortest.
Then to reorder the streams to match the main video, I ran ffmpeg -i lec01_title.mp4 -map 0:a -map 0:v -c:v copy -c:a copy lec01_title_matched.mp4.

  


  Then to concatenate the two files together, I created a text file "concat_list" with :
file 'lec01_title_matched.mp4' file 'lec01.mp4', and ran the command ffmpeg -f concat -safe 0 -i concat_list.txt -c copy -movflags +faststart output.mp4.

  


  The main video is 53 minutes long, but the final output video after concatenating is 1 hour and 43 minutes long.

  


  I'm looking for advice for how to create the "lecture title video" properly to match the parameters of the second video so that I can concatenate them without problems.

  


  Here's the output of ffmpeg -i lec01.mp4 :

  


  ffmpeg version 6.1.1 Copyright (c) 2000-2023 the FFmpeg developers
  built with Apple clang version 15.0.0 (clang-1500.1.0.2.5)
  configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/6.1.1 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags='-Wl,-ld_classic' --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libharfbuzz --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox --enable-neon
  libavutil      58. 29.100 / 58. 29.100
  libavcodec     60. 31.102 / 60. 31.102
  libavformat    60. 16.100 / 60. 16.100
  libavdevice    60.  3.100 / 60.  3.100
  libavfilter     9. 12.100 /  9. 12.100
  libswscale      7.  5.100 /  7.  5.100
  libswresample   4. 12.100 /  4. 12.100
  libpostproc    57.  3.100 / 57.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'dcai_lec01.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    title           : 2-190-wideshot
    encoder         : Lavf60.16.100
  Duration: 00:47:39.08, start: 0.000000, bitrate: 1435 kb/s
  Stream #0:0[0x1](und): Audio: aac (LC) (mp4a / 0x6134706D), 96000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 1298 kb/s, 25 fps, 25 tbr, 12800 tbn (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc60.31.102 libx264


  


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