[Bug]: svt-av1 produces invalid file OR libdav1d can't decode it

[Randrianasulu]

Problem description

Try to encode small video with libsvt-av1 via ffmpeg:

ffmpeg -i 20081103140154.m2t -s 160*120 -c:v libsvtav1 -preset:v 13 av1-1.mkv

resulting file can't be decoded using mpv's default libdav1d decoder:

mpv av1-1.mkv -vo tct --vid=1
 (+) Video --vid=1 (av1 160x120 25.000fps)
 (+) Audio --aid=1 (vorbis 2ch 48000Hz)                                                            Error while decoding frame!
[ffmpeg/video] libdav1d: Error parsing frame header
[ffmpeg/video] libdav1d: Error parsing OBU data
Error while decoding frame!                                                                        [ffmpeg/video] libdav1d: Error parsing OBU data
Error while decoding frame!
[ffmpeg/video] libdav1d: Error parsing frame header
[ffmpeg/video] libdav1d: Error parsing OBU data                                                    Error while decoding frame!                                                                        [ffmpeg/video] libdav1d: Error parsing OBU data

and so on.

it works with libaom decoder

mpv av1-1.mkv -vo tct --vid=1 --vd=libaom-av1
 (+) Video --vid=1 (av1 160x120 25.000fps)
 (+) Audio --aid=1 (vorbis 2ch 48000Hz)

What steps will reproduce the bug?

Encide video with libsvt-av1 via ffmpeg, try to play it with mpv.

What is the expected behavior?

file plays fine

System information

termux-info:

Termux Variables:
TERMUX_API_VERSION=0.50.1
TERMUX_APK_RELEASE=F_DROID
TERMUX_APP_PACKAGE_MANAGER=apt
TERMUX_APP_PID=25526
TERMUX_IS_DEBUGGABLE_BUILD=0
TERMUX_MAIN_PACKAGE_FORMAT=debian
TERMUX_VERSION=0.118.0
Packages CPU architecture:
aarch64
Subscribed repositories:
# sources.list
deb https://packages.termux.org/apt/termux-main stable main
# x11-repo (sources.list.d/x11.list)
deb https://packages.termux.org/apt/termux-x11 x11 main
# tur-repo (sources.list.d/tur.list)
deb https://tur.kcubeterm.com tur-packages tur tur-on-device tur-continuous
Updatable packages:
libopenblas/stable 0.3.25-1 aarch64 [upgradable from: 0.3.25]
libsoxr/stable 0.1.3-5 aarch64 [upgradable from: 0.1.3-4]
sdl2-image/x11 2.8.1 aarch64 [upgradable from: 2.8.0]
xwayland/x11 23.2.3 aarch64 [upgradable from: 23.2.2]
termux-tools version:
1.39.5
Android version:
11
Kernel build information:
Linux localhost 4.14.193 #1 SMP PREEMPT Thu Jul 8 13:58:00 CST 2021 aarch64 Android
Device manufacturer:
DEXP
Device model:
K38
LD Variables:
LD_LIBRARY_PATH=
LD_PRELOAD=/data/data/com.termux/files/usr/lib/libtermux-exec.so
Installed termux plugins:
com.termux.api versionCode:51

[Randrianasulu]

av1-1.webm

test file (plays fine on x86_32 with libdav1d 0.7.1)

[Randrianasulu]

for some reason self-compiled ffmpeg works, so may be +lto or some other packaging flag/patch makes this issue visible?

./ffmpeg -i av1-1.ivf -f null /dev/null
ffmpeg version N-112973-gd2be265cd9 Copyright (c) 2000-2023 the FFmpeg developers                    
built with clang version 17.0.6                                                                    
configuration: --enable-jni --enable-mediacodec --enable-neon --target-os=android --disable-devices --enable-libdav1d                                                                                 
libavutil      58. 33.100 / 58. 33.100                                                             
libavcodec     60. 35.100 / 60. 35.100                                                             
libavformat    60. 18.100 / 60. 18.100                                                             
libavdevice    60.  4.100 / 60.  4.100                                                             
libavfilter     9. 14.100 /  9. 14.100                                                             
libswscale      7.  6.100 /  7.  6.100                                                             
libswresample   4. 13.100 /  4. 13.100                                                           
[libdav1d @ 0xb4000074e18600c0] libdav1d 1.3.0                                                     
Input #0, ivf, from 'av1-1.ivf':                                                                     
Duration: 00:00:00.34, start: 0.007000, bitrate: 1920 kb/s                                         
Stream #0:0: Video: av1 (Main) (AV01 / 0x31305641), yuv420p(tv, bt709), 160x120 [SAR 1:1 DAR 4:3], 25 fps, 25 tbr, 1k tbn                                                                           
[libdav1d @ 0xb4000074e185c460] libdav1d 1.3.0                                                     
Stream mapping:                                                                                      
Stream #0:0 -> #0:0 (av1 (libdav1d) -> wrapped_avframe (native))                                 
Press [q] to stop, [?] for help                                                                    
Output #0, null, to '/dev/null':                                                                     
Metadata:
    encoder         : Lavf60.18.100                                                                  
Stream #0:0: Video: wrapped_avframe, yuv420p(tv, bt709, progressive), 160x120 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 25 fps, 25 tbn                                                                       
Metadata:                                                                                            
encoder         : Lavc60.35.100 wrapped_avframe                                              
[out#0/null @ 0xb40000748185e4d0] video:158kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown                                                                    frame=  336 fps=0.0 q=-0.0 Lsize=N/A time=N/A bitrate=N/A speed=N/A

[Randrianasulu]

rebuild package on device itself - decoding works!

So, I guess previous package was miscompiled somehow?

[Grimler91]

rebuild package on device itself - decoding works!

So, I guess previous package was miscompiled somehow?

Rebuild ffmpeg?

If yes, could you check if deb from CI in #18724 works, so that we know if it is as simple as rebuilding? (if not, then there is some issue with cross-compilation configure step)

[Randrianasulu]

yes, ffmpeg 6.1 package via
"./build-package.sh -f ffmpeg" from termux-packages repo

well, can you post link to deb? I am not sure where in webinterface it exposed ...

[sylirre]

The link is available in "summary" tab of GitHub Actions build.

Here is direct link: https://github.com/termux/termux-packages/suites/19054014996/artifacts/1115334804

This is zip file. You will need to extract it first.

[Randrianasulu]

ah, from main page of repo click on Packages and then select workflow ...

still, while artefacts show up as completed I can't download them, firefox tries to do something for 10 min, direct wget failed

wget https://github.com/termux/termux-packages/suites/19054014996/artifacts/1115334804         
--2023-12-14 21:47:31--  https://github.com/termux/termux-packages/suites/19054014996/artifacts/1115334804                                                                                            Resolving github.com (github.com)... 140.82.121.3                                                  Connecting to github.com (github.com)|140.82.121.3|:443... connected.                              
HTTP request sent, awaiting response... 404 Not Found                                              2023-12-14 21:47:32 ERROR 404: Not Found.

[sylirre]

You can't use wget. You need to log in to GitHub and download via web browser.

[Randrianasulu]

thanks, but it does not work via current mobile firefox too :(

[sylirre]

Uploaded gzipped deb as attachments ffmpeg_6.1-2_aarch64.deb.gz

[Randrianasulu]

it works after installing deb from attachment!

thanks!