[FFmpeg-trac] #10220(undetermined:new): AVIF image's alpha track is not being found
FFmpeg
trac at avcodec.org
Sun Feb 26 16:36:00 EET 2023
#10220: AVIF image's alpha track is not being found
-------------------------------------+-------------------------------------
Reporter: Meten | Owner: (none)
Type: defect | Status: new
Priority: normal | Component:
| undetermined
Version: unspecified | Resolution:
Keywords: av1 libaom- | Blocked By:
av1 |
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Description changed by Meten:
Old description:
> Summary of the bug:
> ffmpeg/ffprobe don't show or can't "see" that there is a 2nd alpha track
> for an AVIF image that does have one.
>
> How to reproduce:
> Create an AVIF image with an alpha layer
> (Using avifenc to create a new AVIF file in a similar fashion will yield
> similar results)
> {{{
> % ffmpeg -hide_banner -i icon.png -c:v libaom-av1 -cpu-used 0 -still-
> picture true -crf:0 56 -crf:1 40 -filter_complex
> 'split[rgb],alphaextract[a]' -pix_fmt:0 yuv420p -map '[rgb]' -map '[a]'
> newicon.avif
> }}}
> Try to do anything with it like e.g. convert it back to a PNG, and FFmpeg
> will complain:
> {{{
> % ffmpeg -hide_banner -i newicon.avif -filter_complex
> "[0:v:1][0:v:0]alphamerge[out]" -map '[out]' out.png
> [libdav1d @ 000002a98be16e00] libdav1d 1.1.0-0-g9593e62
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'newicon.avif':
> Metadata:
> major_brand : avif
> minor_version : 0
> compatible_brands: avifmif1miafMA1B
> Duration: N/A, start: 0.000000, bitrate: N/A
> Stream #0:0[0x1]: Video: av1 (Main), yuv420p(tv,
> unknown/bt709/iec61966-2-1), 184x184 [SAR 1:1 DAR 1:1], 1 fps, 1 tbr, 1
> tbn
> Stream specifier ':v:1' in filtergraph description
> [0:v:1][0:v:0]alphamerge[out] matches no streams.
> }}}
> version used:
> {{{
> ffmpeg version 2023-02-22-git-d5cc7acff1-full_build-www.gyan.dev
> Copyright (c) 2000-2023 the FFmpeg developers
> built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
> }}}
>
> Interestingly, ffprobe does show the alpha track for animated AVIF files.
> Example:
> {{{
> % ffprobe -hide_banner animated_logo.avif
> [libdav1d @ 0000018448b99140] libdav1d 1.1.0-0-g9593e62
> [libdav1d @ 0000018448b9a780] libdav1d 1.1.0-0-g9593e62
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '.\animated_logo.avif':
> Metadata:
> major_brand : avis
> minor_version : 0
> compatible_brands: avisavifmsf1iso8mif1miafMA1B
> Duration: 00:00:01.40, start: 0.000000, bitrate: 69 kb/s
> Stream #0:0[0x1](und): Video: av1 (Main) (av01 / 0x31307661),
> yuv420p(tv, progressive), 256x256 [SAR 1:1 DAR 1:1], 14 kb/s, 15 fps, 15
> tbr, 100k tbn (default)
> Metadata:
> handler_name : PictureHandler
> vendor_id : [0][0][0][0]
> encoder : Lavc60.4.100 libaom-av1
> Stream #0:1[0x2](und): Video: av1 (Main) (av01 / 0x31307661), gray(pc,
> gbr/unknown/unknown, progressive), 256x256 [SAR 1:1 DAR 1:1], 42 kb/s, 15
> fps, 15 tbr, 100k tbn
> Metadata:
> handler_name : PictureHandler
> vendor_id : [0][0][0][0]
> encoder : Lavc60.4.100 libaom-av1
> [libdav1d @ 0000018448b9b400] libdav1d 1.1.0-0-g9593e62
> [libdav1d @ 0000018448b8aac0] libdav1d 1.1.0-0-g9593e62
> }}}
New description:
Summary of the bug:
ffmpeg/ffprobe don't show or can't "see" that there is a 2nd alpha track
for an AVIF image that does have one.
How to reproduce:
Create an AVIF image with an alpha layer
(Using avifenc to create a new AVIF file in a similar fashion will yield
similar results)
{{{
% ffmpeg -hide_banner -i icon.png -c:v libaom-av1 -cpu-used 0 -still-
picture true -crf:0 56 -crf:1 40 -filter_complex
'split[rgb],alphaextract[a]' -pix_fmt:0 yuv420p -map '[rgb]' -map '[a]'
newicon.avif
}}}
Try to do anything with it like e.g. convert it back to a PNG, and FFmpeg
will complain:
{{{
% ffmpeg -hide_banner -i newicon.avif -filter_complex
"[0:v:1][0:v:0]alphamerge[out]" -map '[out]' out.png
[libdav1d @ 000002a98be16e00] libdav1d 1.1.0-0-g9593e62
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'newicon.avif':
Metadata:
major_brand : avif
minor_version : 0
compatible_brands: avifmif1miafMA1B
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0:0[0x1]: Video: av1 (Main), yuv420p(tv,
unknown/bt709/iec61966-2-1), 184x184 [SAR 1:1 DAR 1:1], 1 fps, 1 tbr, 1
tbn
Stream specifier ':v:1' in filtergraph description
[0:v:1][0:v:0]alphamerge[out] matches no streams.
}}}
version used:
{{{
ffmpeg version 2023-02-22-git-d5cc7acff1-full_build-www.gyan.dev Copyright
(c) 2000-2023 the FFmpeg developers
built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-static --disable-
w32threads --disable-autodetect --enable-fontconfig --enable-iconv
--enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma
--enable-libsnappy --enable-zlib --enable-librist --enable-libsrt
--enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray
--enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libdav1d
--enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e
--enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265
--enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl
--enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-
libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-
liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-
amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec
--enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-
libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-
libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-
libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora
--enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-
libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex
--enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite
--enable-libmysofa --enable-librubberband --enable-libsoxr --enable-
chromaprint
libavutil 58. 3.100 / 58. 3.100
libavcodec 60. 4.100 / 60. 4.100
libavformat 60. 4.100 / 60. 4.100
libavdevice 60. 2.100 / 60. 2.100
libavfilter 9. 4.100 / 9. 4.100
libswscale 7. 2.100 / 7. 2.100
libswresample 4. 11.100 / 4. 11.100
libpostproc 57. 2.100 / 57. 2.100
}}}
Interestingly, ffprobe does show the alpha track for animated AVIF files.
Example:
{{{
% ffprobe -hide_banner animated_logo.avif
[libdav1d @ 0000018448b99140] libdav1d 1.1.0-0-g9593e62
[libdav1d @ 0000018448b9a780] libdav1d 1.1.0-0-g9593e62
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '.\animated_logo.avif':
Metadata:
major_brand : avis
minor_version : 0
compatible_brands: avisavifmsf1iso8mif1miafMA1B
Duration: 00:00:01.40, start: 0.000000, bitrate: 69 kb/s
Stream #0:0[0x1](und): Video: av1 (Main) (av01 / 0x31307661),
yuv420p(tv, progressive), 256x256 [SAR 1:1 DAR 1:1], 14 kb/s, 15 fps, 15
tbr, 100k tbn (default)
Metadata:
handler_name : PictureHandler
vendor_id : [0][0][0][0]
encoder : Lavc60.4.100 libaom-av1
Stream #0:1[0x2](und): Video: av1 (Main) (av01 / 0x31307661), gray(pc,
gbr/unknown/unknown, progressive), 256x256 [SAR 1:1 DAR 1:1], 42 kb/s, 15
fps, 15 tbr, 100k tbn
Metadata:
handler_name : PictureHandler
vendor_id : [0][0][0][0]
encoder : Lavc60.4.100 libaom-av1
[libdav1d @ 0000018448b9b400] libdav1d 1.1.0-0-g9593e62
[libdav1d @ 0000018448b8aac0] libdav1d 1.1.0-0-g9593e62
}}}
--
--
Ticket URL: <https://trac.ffmpeg.org/ticket/10220#comment:1>
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