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Sur d’autres sites (5191)

  • Determine the actual resolution of a video using ffmpeg [closed]

    18 novembre 2020, par Eypros

    I am trying to decode an avi video but but when I pass it through ffmpeg to check the encoding parameters I get this outcome which confused me :

    


    $ffmpeg -i video.avi
...
Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 2501 kb/s, 30 fps, 30 tbr, 15360 tbn, 30 tbc (default)


    


    I guess yuv420p means something like 746x420 pixel (I made the multiplication myself, so I am not sure it's exactly this one using the ratio of 1920x1080 and 1280x720) but anyway much less than 1280x720 which is 720p. So, what does exactly means those two together ?
yuv420p vs 1280x720 ?

    


    Can someone explain which is the actual resolution of the video ?

    


  • Stop FFMPEG changing extracted frame resolution

    22 septembre 2020, par S_Wheel

    I'm using a bash script to extract frames from a bunch of videos in a folder.

    


    #!/bin/bash&#xA;if [ "$1" == &#x27;&#x27; ] || [ "$2" == &#x27;&#x27; ] || [ "$3" == &#x27;&#x27; ]; then&#xA;    echo "Usage: $0 <input folder="folder" /> <output folder="folder"> <file extension="extension">";&#xA;    exit;&#xA;fi&#xA;for file in "$1"/*."$3"; do&#xA;    destination="$2${file:${#1}:${#file}-${#1}-${#3}-1}";&#xA;    mkdir -p "$destination";&#xA;    ffmpeg -i "$file" -vsync 0 -frame_pts true -r 1000 "$destination/frame_%d.png";&#xA;done&#xA;</file></output>

    &#xA;

    Using the ffmpeg command :

    &#xA;

    ffmpeg -i "$file" -vsync 0 -frame_pts true -r 1000 -s "$destination/frame_%d.png";&#xA;

    &#xA;

    My problem is the extracted frames have a lower resolution (and also a different resolution). The first video goes from 1024x576 to 768x576 in the extracted frames.

    &#xA;

    I can't force the WxH in the command because the videos all have different resolutions. Does anyone know why ffmpeg is changing the resolution and how to stop it ?

    &#xA;

    Thanks

    &#xA;

  • Is variable resolution possible in MPEG-4 or Matroska ?

    29 août 2020, par Chris_F

    It's become increasingly common for movies to contain sections with varying aspect ratios. For instance, the movie The Dark Knight is is sometime 16:9 full frame, and at other times 2.40:1 with letter boxing. This is fine when viewed on a 16:9 (or even 4:3) screen, but if you try to watch it on a 2.40:1 screen you will get simultaneous horizontal and vertical letterboxes. Extremely undesirable.

    &#xA;

    Currently I use MPC-HC, which has a feature where it is able to analyze the video in real time, detect letter boxing, and dynamically crop the video. This works pretty well, but it's kind of an ugly solution. Are there any video formats that allow meta data like image resolution to change throughout the video ?

    &#xA;

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