Simple fast tool to make mjpeg out of jpg's ?

[nerys]

Is there such a thing? I want to point it at a folder of jpg's assign a frame rate and say "go" and have it make an mjpeg without transcoding or anything just fast make me a file I don't care how big it is (same size as the origin jpg's of course)

Especially important is that it handle 8mp and higher file sizes (so I can make 4k timelapse movies)

suggestions?

basically I use cell phones with extended batteries and external usb batteries so they can run 8+ hours. I use lapse it pro and click go and walk away. I scatter them around to record different views and angles all day.

problem is processing the resulting data. what a PITA. I have yet to find any good software for doing this and NONE that can handle 4k resolutions.

[Budman1]

FFmpeg (Command Line) seems to handle 8 Mega Pixel (3264x2448) okay but if you are converting a JPG to an Mjpeg so I'm not sure you can do it without recoding it. You want a movie basically from the images correct?






EDIT:
Just a thought but if you intend to put 8 hours worth of 8mp images into a video with say 25 fps then the resulting video in Hevc, 4K, x265 is going to be HUGE and encodes slowly also...

Data: Stream #0:0 -> #0:0 (mjpeg (native) -> hevc (libx265))
Data: Press [q] to stop, [?] for help
Data: frame= 241 fps= 12 q=-0.0 size= 584kB time=00:00:07.00 bitrate= 683.7kbits/s dup=238 drop=0 speed=0.351x
Data: frame= 241 fps=5.8 q=-0.0 size= 584kB time=00:00:07.00 bitrate= 683.7kbits/s dup=238 drop=0 speed=0.168x
Data: frame= 359 fps=5.1 q=-0.0 Lsize= 1197kB time=00:00:11.90 bitrate= 823.9kbits/s dup=356 drop=0 speed=0.168x
Data: video:1191kB audio:0kB subtitle:0kB other streams:0kB global headers:1kB muxing overhead: 0.458128%
Data: x265 [info]: frame I: 2, Avg QP:24.24 kb/s: 126037.56
Data: x265 [info]: frame P: 71, Avg QP:33.87 kb/s: 187.60
Data: x265 [info]: frame B: 286, Avg QP:35.72 kb/s: 94.59
Data: x265 [info]: Weighted P-Frames: Y:0.0% UV:0.0%
Data: x265 [info]: consecutive B-frames: 1.4% 0.0% 1.4% 0.0% 97.3%
Data:
Data: encoded 359 frames in 70.75s (5.07 fps), 814.62 kb/s, Avg QP:35.29

[LigH.de]

Simple solution to concatenate JPEGs to an MJPG AVI: http://makeavi.sourceforge.net/ (unfortunately I am not sure if it would recode frames or just copy, that's not so clearly documented).

Apart from that, it should be possible to have ffmpeg copy a sequence of JPEG images into MJPG using an sprintf filename pattern for the input, and "-codec copy" to avoid recoding. See: question on stackexchange (syntax might be outdated, not sure).

[TorBru]

I'm pretty sure that it is not possible to convert JPG's into MJPG without reencoding. To create a slideshow from images a simple ffmpeg command could be used. FFQueue also has a GUI that utilizes this feature:

[Cornucopia]

Jpg vs. Mjpg,
There's a very good chance that the color spaces won't match up (mjpeg should expect 601, 709), so then you have to live with wrong colors or do the colorspace conversion (thus requiring re-encoding).

Scott