#9160: ffmpeg stuck at initialization
--------------------------------+--------------------------------------
Reporter: Gyan | Type: defect
Status: new | Priority: important
Component: ffmpeg | Version: git-master
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
--------------------------------+--------------------------------------
ffmpeg gets stuck at initialization with the following command, with a CPU
core running steady near 100%:
{{{
cat video.ts | ffmpeg -i - -f image2 -loop 1 -re -i image.png
-filter_complex
"[0:v]scale=iw:ih[in];[1][in]scale2ref[img][in1];[in1][img]overlay[out]"
-map "[out]" -map 0:a -f null -
}}}
The sufficient and necessary conditions appear to be that the first input
be non-seekable, and the image input have the `-re` flag applied. Removing
either of these conditions and the issue disappears.
Based on the nature I suspected that one or more commits made to ffmpeg.c
in Oct 2020 might be the culprit. And indeed, the issue doesn't occur with
my 2020-10-28 build but does occur with my 2020-10-31 build. The commits I
suspect are 67be1ce0c6 and 7369595c55.
How to generate inputs:
{{{
ffmpeg -f lavfi -i testsrc2 -f lavfi -i sine -t 5 video.ts
ffmpeg -f lavfi -i mandelbrot -vframes 1 image.png
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/9160>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
_______________________________________________
FFmpeg-trac mailing list
FFmpeg-trac@avcodec.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-trac
To unsubscribe, visit link above, or email
ffmpeg-trac-requ...@ffmpeg.org with subject "unsubscribe".
