Dear FFmpeg users,
I've encountered OOM "issue" when encoding PNG image to AVIF using ffmpeg. I
have an example of successful conversion for the image about 6000x1800x32, but
a bit larger image 7147×1783×32 causes OOM.
Any idea why image raster of 7147×1783×4 ~ 50 MB requires ~ 3 GB of memory
(which is at least ×50 more memory than raster)? And how to workaround the
issue?
Many thanks in advance!
$ ffmpeg -i test.png -c:v libaom-av1 -crf 30 test.avif
ffmpeg version 5.1.3-1 Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 12 (Debian 12.2.0-14)
configuration: --prefix=/usr --extra-version=1 --toolchain=hardened
--libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu
--arch=amd64 --enable-gpl --disable-stripping
--enable-gnutls --enable-ladspa --enable-libaom --enable-libass
--enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio
--enable-libcodec2 --enable-libdav1d --enable-libflite
--enable-libfontconfig --enable-libfreetype --enable-libfribidi
--enable-libglslang --enable-libgme --enable-libgsm --enable-libjack
--enable-libmp3lame --enable-libmysofa --enable-libopenjpeg
--enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq
--enable-librist --enable-librubberband --enable-libshine --enable-libsnappy
--enable-libsoxr --enable-libspeex
--enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora
--enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx
--enable-libwebp --enable-libx265 --enable-libxml2
--enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2
--enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2
--disable-sndio --enable-libjxl
--enable-pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394
--enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r
--enable-libx264 --enable-libplacebo
--enable-librav1e --enable-shared
Input #0, png_pipe, from 'test.png':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: png, rgba(pc), 7147x1783 [SAR 2835:2835 DAR 7147:1783],
25 fps, 25 tbr, 25 tbn
Stream mapping:
Stream #0:0 -> #0:0 (png (native) -> av1 (libaom-av1))
Press [q] to stop, [?] for help
[libaom-av1 @ 0x55b79026db40] v3.6.0
Output #0, avif, to 'test.avif':
Metadata:
encoder : Lavf59.27.100
Stream #0:0: Video: av1 (av01 / 0x31307661), gbrp(pc, gbr/unknown/unknown,
progressive), 7147x1783 [SAR 1:1 DAR 7147:1783], q=2-31, 25 fps, 12800 tbn
(default)
Metadata:
encoder : Lavc59.37.100 libaom-av1
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
Killed 1 fps=0.6 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A speed=
0x
# free -t
total used free shared buff/cache available
Mem: 8017020 4833284 1275188 119672 2330812 3183736
Swap: 102396 102396 0
Total: 8119416 4935680 1275188
From /var/log/kernel.log
kernel: ffmpeg invoked oom-killer:
gfp_mask=0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_ZERO), order=0,
oom_score_adj=0
kernel: CPU: 0 PID: 466425 Comm: ffmpeg Not tainted 6.1.0-10-amd64 #1 Debian
6.1.38-1
kernel: Call Trace:
kernel: <TASK>
kernel: dump_stack_lvl+0x44/0x5c
kernel: dump_header+0x4a/0x211
kernel: oom_kill_process.cold+0xb/0x10
kernel: out_of_memory+0x1fd/0x4c0
kernel: __alloc_pages_slowpath.constprop.0+0xc73/0xdc0
kernel: __alloc_pages+0x305/0x330
kernel: __folio_alloc+0x17/0x50
kernel: ? policy_node+0x51/0x70
kernel: vma_alloc_folio+0x9c/0x370
kernel: __handle_mm_fault+0x92f/0xfa0
kernel: handle_mm_fault+0xdb/0x2d0
kernel: do_user_addr_fault+0x19c/0x570
kernel: exc_page_fault+0x70/0x170
kernel: asm_exc_page_fault+0x22/0x30
kernel: RIP: 0033:0x7f3cf8f7204a
...
kernel: Mem-Info:
kernel: active_anon:153032 inactive_anon:1662278 isolated_anon:0
kernel: active_file:382 inactive_file:2194 isolated_file:98
kernel: unevictable:11644 dirty:356 writeback:0
kernel: slab_reclaimable:48560 slab_unreclaimable:43800
kernel: mapped:9888 shmem:25129 pagetables:11368
kernel: sec_pagetables:0 bounce:0
kernel: kernel_misc_reclaimable:0
kernel: free:24673 free_pcp:174 free_cma:0
kernel: 28496 total pagecache pages
kernel: 332 pages in swap cache
kernel: Free swap = 0kB
kernel: Total swap = 102396kB
kernel: 2068610 pages RAM
kernel: 0 pages HighMem/MovableOnly
kernel: 64355 pages reserved
kernel: 0 pages hwpoisoned
kernel: Tasks state (memory values in pages):
kernel: [ pid ] uid tgid total_vm rss pgtables_bytes swapents
oom_score_adj name
kernel: [ 466425] 1000 466425 1093593 808340 7086080 0
0 ffmpeg
...
kernel:
oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=user.slice,mems_allowed=0,global_oom,task_memcg=/user.slice/user-1000.slice/session-c1.scope,task=ffmpeg,pid=466425,uid=1000
kernel: Out of memory: Killed process 466425 (ffmpeg) total-vm:4374372kB,
anon-rss:3233360kB, file-rss:0kB, shmem-rss:0kB, UID:1000 pgtables:6920kB
oom_score_adj:0
--
With best regards,
Dmitry
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