FFmpeg makes frames with quality issues

[arizel]

Summary of the bug:
I have a problem making frames from a video. Frames in output has different colors in comparison with the video.
Video characteristics (analysed using ffprobe):
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/arizel/Downloads/IMG_9525_7064.mov':

Metadata:

major_brand : qt
minor_version : 0
compatible_brands: qt
creation_time : 2023-06-20T15:45:07.000000Z
com.apple.quicktime.location.accuracy.horizontal: 4.740115
com.apple.quicktime.location.ISO6709: +47.7496+022.3923+120.265/
com.apple.quicktime.make: Apple
com.apple.quicktime.model: iPhone 14 Pro Max
com.apple.quicktime.software: 16.5
com.apple.quicktime.creationdate: 2023-06-20T18:45:07+0300

Duration: 00:00:10.80, start: 0.000000, bitrate: 8795 kb/s
Stream #0:0[0x1](und): Video: hevc (Main 10) (hvc1 / 0x31637668), yuv420p10le(tv, bt2020nc/bt2020/arib-std-b67), 1920x1080, 8565 kb/s, 30 fps, 30 tbr, 600 tbn (default)

Metadata:

creation_time : 2023-06-20T15:45:07.000000Z
handler_name : Core Media Video
vendor_id : [0][0][0][0]
encoder : HEVC

Side data:

DOVI configuration record: version: 1.0, profile: 8, level: 4, rpu flag: 1, el flag: 0, bl flag: 1, compatibility id: 4
displaymatrix: rotation of -90.00 degrees

Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 182 kb/s (default)

Metadata:

creation_time : 2023-06-20T15:45:07.000000Z
handler_name : Core Media Audio
vendor_id : [0][0][0][0]

Stream #0:2[0x3](und): Data: none (mebx / 0x7862656D), 0 kb/s (default)

Metadata:

creation_time : 2023-06-20T15:45:07.000000Z
handler_name : Core Media Metadata

Stream #0:3[0x4](und): Data: none (mebx / 0x7862656D), 0 kb/s (default)

Metadata:

creation_time : 2023-06-20T15:45:07.000000Z
handler_name : Core Media Metadata

Stream #0:4[0x5](und): Data: none (mebx / 0x7862656D), 34 kb/s (default)

Metadata:

creation_time : 2023-06-20T15:45:07.000000Z
handler_name : Core Media Metadata

Unsupported codec with id 0 for input stream 2
Unsupported codec with id 0 for input stream 3
Unsupported codec with id 0 for input stream 4

How to reproduce:

% ffmpeg -hide_banner -y -i "IMG_9525_7064.mov" -t 10 -vf "scale=w=480:h=-1, fps=5" -pix_fmt rgb24 frames%06d.jpg

ffmpeg version 6.0 Copyright (c) 2000-2023 the FFmpeg developers
built with Apple clang version 14.0.3 (clang-1403.0.22.14.1)

[arizel]

original video

[arizel]

Frame with quality problem

[Michael Koch]

On Windows I see no difference, with FFplay for the video and IrfanView for the image. Might be a player issue. Please note that in your command line you did make a JPG, but the uploaded image is a PNG. I think "-pix_fmt rgb24" in your command line doesn't make sense for JPG output.

[Michael Koch]

Use this command for extracting JPG images from the video:
ffmpeg -i burger.mp4 -vf framestep=10 burger%%3d.jpg

Make this batch file and save it on the desktop:
ffplay -loop 0 -t 0 -x 500 -an %1
pause

Drag and drop the first extracted image on the icon of the batch file.
Drag and drop the video on the icon of the batch file. It will show only the first frame of the video.

Now you see both frames side by side (with the same player) and there should be no difference.

P.S. %%3d is for Windows batch file. You may have to change that to %3d.

[Michael Koch]

Do you still see different colors when using the same player? If not, then we can close this ticket.

[arizel]

Thank you for answer and suggestions. Actually I still have problem with colors. I have attached screenshot how it looks on my computer (MacOS). You can sure that problem still exists.
I made frames using command:
ffmpeg -i burger.mp4 -vf framestep=10 burger%3d.jpg
Then I opened video by default application in macOS(quick time player) and default program for images. The main problem that iphone users see difference between their video and frame images and we need to fix that.
Could you please try to reproduce this issue on macOS? I believe it will help to understand the problem.
Thank you in advance!

[arizel]

Comparing frame.jpg with original video

[Michael Koch]

Replying to arizel:

I made frames using command:
ffmpeg -i burger.mp4 -vf framestep=10 burger%3d.jpg
Then I opened video by default application in macOS(quick time player) and default program for images.

Why do you compare a PNG when you did make a JPG? Where does the PNG come from?

[Michael Koch]

I still think it's a player issue and will vanish when you show both images with the same player. Or extract all frames from the video and re-assemble them to a new video, and then compare the old and new video.

[Balling]

PNG is tagged as Identity matrix (full range), HLG, BT.2020 primaries by using the new W3C cICP chunk spec. Apple does not support it yet. Bug in Apple. Only mpv supports it.

[arizel]

Replying to Balling:

PNG is tagged as Identity matrix (full range), HLG, BT.2020 primaries by using the new W3C cICP chunk spec. Apple does not support it yet. Bug in Apple. Only mpv supports it.

Thank you for information!