Csdrhrt

This is using ffmpeg version 3.4.4-0ubuntu0.18.04.1 on Ubuntu 18.04.

I'd like to achieve the same as in Create video with 5 images with fadeIn/out effect in ffmpeg (mostly "Dip to black", although I'd like to know about "Crossfade" too) - however, I have many files, and would prefer to use absolute paths, and I'm afraid I'll run into some command line limitation if I list each file on the command line.

So, I've found this ( the same is noted on ffmpeg slideshow with crossfade ):

• https://en.wikibooks.org/wiki/FFMPEG_An_Intermediate_Guide/image_sequence#Slideshow_with_crossfading_between_the_pictures

... which mentions:

"A" is the duration in seconds how long each picture is shown (without the crossfade duration), and "B" is the crossfade duration in seconds.

ffmpeg -i IMG_%3d.jpg -vf zoompan=d=(A+B)/B:fps=1/B,framerate=25:interp_start=0:interp_end=255:scene=100 -c:v mpeg4 -maxrate 5M -q:v 2 out.mp4

So, i have these images:

$ ls /path/to/test_*.jpg | wc -l

249

I'd like framerate to be 25 fps, duration of each image without fade: quarter second, 0.25 sec (so 6.25 frames, or floored, 6 frames), and fade duration 4 frames (so 0.16 sec @ 25 fps). So I'd expect at least 249*(6+4) = 2490 frames, or 99.6 sec at 25 fps.

This is the format of the images (from a phone camera):

$ mediainfo /path/to/test_IMG_11a.jpg

General

Complete name                            : /path/to/test_IMG_11a.jpg

Format                                   : JPEG

File size                                : 1 001 KiB



Image

Format                                   : JPEG

Width                                    : 3 840 pixels

Height                                   : 2 160 pixels

Color space                              : YUV

Chroma subsampling                       : 4:2:2

Bit depth                                : 8 bits

Compression mode                         : Lossy

Stream size                              : 1 001 KiB (100%)

So, I try this command line:

ffmpeg -an -f image2 -pattern_type glob -i '/path/to/test_*.jpg' 

-vf 'fps=25,zoompan=d=(0.25+0.16)/0.16:fps=1/0.16,framerate=25:interp_start=0:interp_end=255:scene=100' 

-vcodec libx264 -pix_fmt yuv420p -profile:v baseline -level 3 

-y out.mp4

This results with two problems:

The first problem is:

[swscaler @ 0x5582a63a4500] deprecated pixel format used, make sure you did set range correctly

    Last message repeated 3 times

While I don't call scale directly, apparently it is implied, because I see in https://trac.ffmpeg.org/wiki/colorspace:

YUV-to-RGB or scaling requires swscale.

The post https://stackoverflow.com/questions/43038294/im-getting-error-deprecated-pixel-format-used-make-sure-you-did-set-range-corr notes this warning can be ignored. However, I'd like to get it right; I've found:

• [Libav-user] deprecated pixel format used, make sure you did set range correctly

But if you use swscale, you also have to be set the range yourself, or the result will be incorrect.

• 
  Converting yuvj420p to yuv420p - issues with black levels? : ffmpeg with a "solved" example that uses colorspace

... but I have no idea how to specify colorspace for my images

Second problem: not sure if it is related to the first problem, but the output video as result of the above command stops at frame= 421 - and I can see, most of my 249 images are not encoded! Vlc sees some 16 seconds in the output video - way below the 2490 frames, or 99.6 sec, that I expect.

So, what is the correct command line invocation, to get a slide show from image sequence with fade, without the deprecation warnings and with all images encoded?