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• Adding unique RGB color watermark per video frame with FFmpeg

  8 juin 2016, par Dustin Kerstein

  I’d like to add a unique watermark onto each unique video frame in an h264 mp4 video. More specifically, I want the watermark to be a X by X pixel square solid 8-bit RGB color, and each color watermark should be unique across all frames in the video (up to the theoretical 24 bit max of 16.7 million colors/frames).

  Is this possible to do programatically using FFmpeg filters (or another tool) without requiring a photo for each possible color watermark ?

  If not, assuming I already have the full set of 1029 solid color photos downloaded from http://www.solidbackgrounds.com, can anyone think of an easy way to watermark a video with <= 1029 frames using FFmpeg ?

• How to preserve color when extracting thumbnail from videos with FFMPEG ?

  7 novembre 2022, par coffee-cat

  I'm using FFMPEG to extract thumbnails from arbitrary user-submitted videos to jpg and the outputs are noticeably darker than the input video.

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  Here is an image captured of a MP4 input (SMPTE Color Bars) using Mac OS's built in screen capture utility (which seems to have a reasonably accurate color representation. Red value on this image is R : 191, G : 0, B : 1.
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  Here is the same image captured using the FFMPEG script below. Red value on this image is R : 176, G : 0, B : 2.
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  Here is the ffmpeg options I'm using to extract these images :

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  ffmpeg -i input-video.mp4 \
    -vframes 1 \
    -filter:v scale=600:-1 \
    -qscale:v 90 \
    -f singlejpeg \
    thumb.jpg 


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  Any thoughts on how to solve this ?

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  (Note that while there are related topics on Stack Overflow, all of them are specific to known input video types. I'm looking for a solution that will work across arbitrary inputs.)

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• Encode multiple files from the same Folder with Google Colab & FFmpeg

  16 août 2021, par Ptibouc77

  i made a Google colab to encode my videos, but actually i can only do files on by one.&#xA;I want to encode all video files from the same folder.

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  I tried this but didn't seem to works

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      import os

DIRECTORY= '/content/drive/My Drive/Videos'
for filename in os.listdir(DIRECTORY):
    if (filename.endswith(".mov")): #or .avi, .mpeg, whatever.
        os.system("ffmpeg -i {0} -c:v libx265 -crf 26 -c:a aac -b:a 160k output%d.mp4".format(filename))
        print(filename)


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  Edit : I edited the FFmpeg command but still not workings on Google Colab.&#xA;Edit 2 : Print command only return the name of the files with the extension like "MyMovie.mov" how do i put the full path to the ffmpeg command ? I also want to put the ouput files to a subfolder named x265

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