#11370: Transcoding single-frame APNG to AVIF results in very long encoding time
-------------------------------------+-------------------------------------
Reporter: 9e80 | Type: defect
Status: new | Priority: normal
Component: ffmpeg | Version: 7.1
Keywords: apng, avif, | Blocked By:
libaom |
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
I will attach input APNG and logfile. Encoding takes many hours on beefy
hardware. I do not know the exact amount of time, perhaps 12-16 hours.
Single frame of input APNG seems to be decoded and passed to libaom
encoder many times instead of one time as with transcoding to e.g. WEBP.
How to reproduce:
{{{
% ffmpeg -report -i
9e80eb2ff0613c3d6c83d204985fd5163c961ff6a5b2f64821ed5ea344b2d019.png -y
deleteme.avif
ffmpeg started on 2024-12-24 at 09:55:18
Report written to "ffmpeg-20241224-095518.log"
Log level: 48
ffmpeg version 7.1 Copyright (c) 2000-2024 the FFmpeg developers
built with Apple clang version 16.0.0 (clang-1600.0.26.4)
configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/7.1_3 --enable-
shared --enable-pthreads --enable-version3 --cc=clang --host-cflags=
--host-ldflags='-Wl,-ld_classic' --enable-ffplay --enable-gnutls --enable-
gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-
libdav1d --enable-libharfbuzz --enable-libjxl --enable-libmp3lame
--enable-libopus --enable-librav1e --enable-librist --enable-librubberband
--enable-libsnappy --enable-libsrt --enable-libssh --enable-libsvtav1
--enable-libtesseract --enable-libtheora --enable-libvidstab --enable-
libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-
libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma
--enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-
libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-
libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-
libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox
--enable-audiotoolbox --enable-neon
libavutil 59. 39.100 / 59. 39.100
libavcodec 61. 19.100 / 61. 19.100
libavformat 61. 7.100 / 61. 7.100
libavdevice 61. 3.100 / 61. 3.100
libavfilter 10. 4.100 / 10. 4.100
libswscale 8. 3.100 / 8. 3.100
libswresample 5. 3.100 / 5. 3.100
libpostproc 58. 3.100 / 58. 3.100
Input #0, apng, from
'9e80eb2ff0613c3d6c83d204985fd5163c961ff6a5b2f64821ed5ea344b2d019.png':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: apng, rgba(pc, gbr/unknown/unknown), 816x624, 100k
tbr, 100k tbn
Stream mapping:
Stream #0:0 -> #0:0 (apng (native) -> av1 (libaom-av1))
Press [q] to stop, [?] for help
[libaom-av1 @ 0x152705ca0] 3.11.0
[libaom-av1 @ 0x152705ca0] Neither bitrate nor constrained quality
specified, using default CRF of 32
Output #0, avif, to 'deleteme.avif':
Metadata:
encoder : Lavf61.7.100
Stream #0:0: Video: av1 (av01 / 0x31307661), gbrp(pc,
gbr/unknown/unknown, progressive), 816x624, q=2-31, 100k fps, 100k tbn
(default)
Metadata:
encoder : Lavc61.19.100 libaom-av1
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
^C^C^CReceived > 3 system signals, hard exiting=00:00:00.00 bitrate=
0.0kbits/s dup=349999 drop=0 speed=6.72e-05x
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/11370>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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