#9535: PNG decoder fails processing more than a certain number of frames
-------------------------------------+-------------------------------------
Reporter: panthalassa | Type: defect
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: png | Blocked By:
decoding |
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Summary of the bug: trying to encode a video with more than a certain
number of frames from a .png sequence results in corrupted output and an
out-of-memory scenario
How to reproduce:
Sorry but due to the absurd bandwith requirements I likely won't be able
to upload the offending files. This can likely be reproduced by converting
a long, losslessly compressed video into a sufficient number of PNG's (my
stats: 11 minute 1080p video at 60fps = ~39,000 frames, each frame 1.9mb
making the uncompressed video around 80gb) I acquired these frames from
rendering in Blender
Present on all versions I've tested from 3.4.8 to 4.4.1. Any png-based
input fails with too many files in the directory - symptoms include the
encoded video having scrambled frame order after about 1000 frames, as
well as the [png @ 0x??? chunk too big] error after about 14750 processed
frames.
Taking a generous swathe of images around the error points and processing
them separately produces no errors implying that a corrupted PNG is not to
blame.
Putting a smaller (1-2000) number of frames in a directory and processing
them separately produces a successful result longer than 1000 frames, past
the previous point of onset for corruption. Unknown exactly how many
frames are needed to cause the error.
Any format encoding that receiving raw PNG input appears to be bugged -
libx264rgb, libx265, ffv1 tested
Latest tested version: clean install of N-104671-g2cddb2f7a8 on a live USB
of Linux Mint 19.1 MATE following the instructions on the Compile FFMPEG
page
{{{
% ffmpeg -framerate 60 -f image2 -pattern_type glob -i $1'/*.png' -vcodec
libx265 -pix_fmt yuv420p10le -vf scale=out_range=pc $2
% ffmpeg -framerate 60 -f image2 -pattern_type glob -i $1'/*.png' -vcodec
ffv1 -coder 1 -level 3 -threads 4 -slices 4 -pix_fmt bgra $2
ffmpeg version: N-104671-g2cddb2f7a8
built on ... Linux Mint 19.1 MATE live USB
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/9535>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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