Resolution metadata for JPEG with orientation

[Jozef Chutka]

In the current version (N-108614-g37ee36f689-20221011) of FFmpeg and FFprobe when a JPEG with orientation side data is in use, the reported resolution does not respect the applied orientation.

ffprobe -i input.jpg
...
Input #0, image2, from 'input.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 50360 kb/s
  Stream #0:0: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 1800x1200 [SAR 72:72 DAR 3:2], 25 fps, 25 tbr, 25 tbn

For example image 1800x1200 with orientation 90, should report resolution 1200x1800.

Following are the main reasons:

1. when such media is being loaded and encoded the output has the correct resolution ffmpeg -i input.jpg -y output.png will change from reported 1800x1200 to 1200x1800 (confusing).

Input #0, image2, from 'input.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 50360 kb/s
  Stream #0:0: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 1800x1200 [SAR 72:72 DAR 3:2], 25 fps, 25 tbr, 25 tbn
...
Output #0, image2, to 'output.png':
  Metadata:
    encoder         : Lavf59.34.101
  Stream #0:0: Video: png, rgb24(pc, gbr/unknown/unknown, progressive), 1200x1800 [SAR 1:1 DAR 2:3], q=2-31, 200 kb/s, 2

2. Any software (photoshop, chrome, ...) that opens JPEG with orientation will report resolution following the orientation metadata.

3. The resolution information without orientation respected has no real life use for end user I can think of.

4. Correct me if I am wrong, but it seems impossible to extract orientation information using ffmpeg executable, the only way I managed to discover is to use ffprobe -show_frames and parse SIDE_DATA

[Carl Eugen Hoyos]

I don't think this is a valid ticket.