#11366: Regression when prepending/concatenating still image to video
-------------------------------------+-------------------------------------
Reporter: mahozad | Type: defect
Status: new | Priority: normal
Component: | Version: 7.1
undetermined |
Keywords: concat | Blocked By:
concatenate filter_complex |
Blocking: | Reproduced by developer: 1
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
**Summary of the bug:**
I'm using FFmpeg to create clips with ability to concat an image to be
shown at the start of the clip for the specified duration:
https://github.com/mahozad/cutcon
It uses FFmpeg CLI.
FFmpeg version 6.1.1 (and I think also version 5.1.2) worked as expected.
When upgrading to FFmpeg 7.1, the result video just contains the intro
image and then just ends.
I'm not sure if this is a regression. Maybe my FFmpeg command is "wrong"
and it should have failed in previous versions as well?
**How to reproduce:**
FFmpeg 7.1 and also FFmpeg-full 2024-12-19-git-494c961379 downloaded from
https://www.gyan.dev/ffmpeg/builds/
both tested on Windows 11.
Here is an example FFmpeg invocation (formatted, each option in a new
line) to reproduce the problem.
It tries to create a clip from an input MP4 file and show an image at the
start for 8 seconds. The image size is coerced to be at maximum the size
of video and is padded with black color if its aspect ratio is different
than the video. There is some other filters too.
{{{
path/to/ffmpeg.exe
-y
-nostdin
-loglevel
info
-stats_period
0.1s
-accurate_seek
-ss
356500ms
-to
378500ms
-i
path/to/a/video.mp4
-loop
1
-framerate
25
-t
8s
-i
path/to/a/picture.jpg
-t
8s
-f
lavfi
-i
aevalsrc=0
-filter_complex
[0] yadif=1 [media-de-interlaced];
[media-de-interlaced] scale=iw*sar:ih [media-anamorphic-fixed];
[media-anamorphic-fixed] pad=ceil(iw/2)*2:ceil(ih/2)*2 [media-odd-
pixel-number-fixed];
[media-odd-pixel-number-fixed] setsar=1/1 [media-source-aspect-
ratio-normalized];
[media-source-aspect-ratio-normalized] null [media];
[1][media]
scale2ref='if(gt(main_a,a),min(main_w,iw),min(main_h,ih)*main_a)':'if(gt(main_a,a),min(main_w,iw)/main_a,min(main_h,ih))'
[intro-image-max-size-coerced][media];
[1][media] scale2ref=iw:ih [size-template][media];
[size-template] drawbox=w=iw:h=ih:t=fill:color=#000000 [intro-
background];
[intro-background][intro-image-max-size-coerced]
overlay=x='(W-w)/2':y='(H-h)/2' [intro-with-background];
[intro-with-background] setsar=1/1 [intro-source-aspect-ratio-
normalized];
[intro-source-aspect-ratio-normalized] null [intro];
[intro][2][media] concat=n=2:v=1:a=1
-c:v
libx264
-c:a
aac
-crf
23
-r
25
-metadata
encoding_tool=Cutcon v1.2.3
path/to/output.mp4
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/11366>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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