jpeg2yuv(1)

✨ jpeg2yuv(1) ✨ — the MJPEG tools manual, but make it a group chat 💖

okay bestie, sit down, hydrate, and let me tell you about jpeg2yuv 💅 this lil icon lives in the MJPEG tools manual and it's literally here to turn your JPEGs into YUV. no cap.

🌸 NAME 🌸

jpeg2yuv — Convert jpeg images to the yuv format. that's it, that's the job, she's a converter and she's serving 🫶

🎀 SYNOPSIS 🎀

jpeg2yuv [-b num] [-f num] [-I num] [-A ratio] [-L num] [-n num] [-l
num] [-j filename]

💖 DESCRIPTION 💖

so here's the vibe: jpeg2yuv decompresses a sequence of JPEG files and pipes that image data to stdout as a YUV4MPEG2 stream. she's not picky either — any JPEG format supported by libjpeg can be read. queen behavior honestly 👑

stdout is gonna be absolutely filled with the YUV4MPEG2 movie data stream, so be prepared, bestie: pipe it on to mpeg2enc, or write it into a file. do not just let it scream into your terminal, it's giving chaos 💀

✨ OPTIONS ✨

jpeg2yuv accepts the following options:

• -b num — Frame offset: skip output of the first num frames. (default: 0) like, we're not starting at the beginning, we're starting at the vibe we chose 🙈
• -f num — Set the frame rate of stream, accepts the same numbers. No default, this option has to be specified. no default means no default, bestie, you will be typing this 😭
• -A ratio — Sample aspect ratio. Default is square pixels (1:1) ⬜
• -I num — interlacing mode:
  • p = none / progressive
  • t = top field first
  • b = bottom field first

No default, this option has to be specified. again: mandatory. she needs to know your fields 🧚

• -L num — the field situation:
  • 0 = non-interlaced (two successive fields per JPEG file)
  • 1 = interlaced fields
• -l num — Specifies the number of loops (default: 0 loops). When this option is not used the given range of images is only processed once. If you use this option with num of -1 jpeg2yuv will loop forever, writing the image to stdout (forever is a long time, just so we're clear 🔥). When you use n > 0 it will loop n-times till it finishes. iconic.
• -j {1}%{2}d{3} — Read JPEG frames with the name components as follows:
  • {1} JPEG filename prefix (e g: picture_ )
  • {2} Counting placeholder (like in C, printf, eg 06 ))
  • {3} File extension. Something like this: .jpg A correct description of the files could look like this: picture_%06d.jpg

If this option is omited, the filenames are read from stdin. For example:

$ls *jpg | jpeg2yuv -f 25 -I p > result.yuv

(yes, "omited" is how it's spelled up in here, we don't gatekeep typos, we gatekeep flags 🫶)

• -R 1 or 0 — rescale YUV color values from 0-255 to 16-235 (default: 1) 🌈
• -v num — Verbosity level (0, 1 or 2). pick your level of yapping 🗣️

💀 BUGS 💀

The frame rate description seems not to be up to date. The NTSC integer ratios seem not to be supported. As a workaround specify a PAL (25) or FILM (24) and set the right frame rate in mpeg2enc with the -F option.

not me having to work around a bug in 2001 energy 😭 but fr fr, that's the workaround, use it.

👑 AUTHOR 👑

This man page was written by Bernhard Praschinger.

If you have questions, remarks, problems or you just want to contact the developers, the main mailing list for the MJPEG-tools is:

mjpeg-users@lists.sourceforge.net

For more info, see our website at

http://mjpeg.sourceforge.net

🦋 SEE ALSO 🦋

mjpegtools(1), mpeg2enc(1), ppmtoy4m(1), yuv2lav(1), yuvdenoise(1), yuvmedianfilter(1), yuvscaler(1)

and that's the whole page, bestie!! brought to you by the MJPEG Tools Team, dated 8 December 2001 — yes she's an elder but she still ate 💅✨ periodt. go convert something. 🎀