Licenses & credits

FFmpeg (LGPL)

Zapline for Android includes audio decoders from FFmpeg, used through the AndroidX Media3 decoder_ffmpeg extension (Media3 1.11.1, Apache License 2.0). FFmpeg is licensed under the GNU Lesser General Public License version 2.1 or later. Zapline's build is LGPL only: configured with --disable-gpl --disable-nonfree, no GPL or non-free parts. FFmpeg is linked into a separate shared library (libffmpegJNI.so) inside the app.

Exact version

FFmpeg branch release/6.0, commit 573f2b81ebd9 (RELEASE file: 6.0.2), unmodified.
Source tarball of that commit, hosted here: ffmpeg-6.0-573f2b81.tar.gz (14.8 MB, SHA-256 b2e888da05e52ac7c23fef4955bc28d6da948b6e2843d4f6cd421ac13fea804d). Same file as GitHub's archive of the commit; official repository: https://git.ffmpeg.org/ffmpeg.git.
Media3 glue code: androidx/media tag 1.11.1, libraries/decoder_ffmpeg (commit 8c6678b657ed).
Build script used for the shipped library: build_ffmpeg.sh (NDK 28.2.13676358, Android API 24, ABIs arm64-v8a, armeabi-v7a, x86_64).

Configure flags

Common to every ABI:

--target-os=android --enable-static --disable-shared --disable-doc --disable-programs --disable-everything --disable-avdevice --disable-avformat --disable-swscale --disable-postproc --disable-avfilter --disable-symver --enable-swresample --extra-ldexeflags=-pie --disable-v4l2-m2m --disable-vulkan --disable-gpl --disable-nonfree --enable-decoder=ac3 --enable-decoder=eac3 --enable-decoder=dca --enable-decoder=truehd --enable-decoder=mlp --enable-decoder=mp2 --enable-decoder=mp3 --enable-decoder=flac --enable-decoder=vorbis --enable-decoder=opus --enable-decoder=alac --enable-decoder=pcm_s16le --enable-decoder=pcm_s24le --enable-decoder=pcm_s32le --enable-decoder=aac

Per ABI (plus --libdir=android-libs/<abi> and the NDK --nm/--ar/--ranlib/--strip tools):

armeabi-v7a: --arch=arm --cpu=armv7-a --cross-prefix=armv7a-linux-androideabi24- --extra-cflags="-march=armv7-a -mfloat-abi=softfp" --extra-ldflags="-Wl,--fix-cortex-a8"
arm64-v8a:   --arch=aarch64 --cpu=armv8-a --cross-prefix=aarch64-linux-android24-
x86_64:      --arch=x86_64 --cpu=x86-64 --cross-prefix=x86_64-linux-android24- --disable-asm

Written offer

For at least three years from the last time we distribute this version of Zapline, we will give anyone who asks a complete machine-readable copy of the source code of the FFmpeg library used in it, together with the build scripts, for no more than the cost of physically performing the distribution. Write to gnurtnel@gmail.com. You may modify FFmpeg and rebuild libffmpegJNI.so with the script above; reverse engineering for debugging such modifications is permitted.

Demo content (Creative Commons Attribution)

The in-app demo uses fictional channels, guide data, logos and the fictional series “Harbor Lights”, generated for Zapline. No real broadcaster, brand or programme is depicted. All video comes from Blender Foundation / Blender Studio open movies. © Blender Foundation | www.blender.org

Film	Year	License	Studio site
Big Buck Bunny	2008	CC BY 3.0	https://peach.blender.org
Elephants Dream	2006	CC BY 2.5	https://orange.blender.org
Sintel	2010	CC BY 3.0	https://durian.blender.org
Tears of Steel	2012	CC BY 3.0	https://mango.blender.org
Cosmos Laundromat	2015	CC BY 4.0	https://studio.blender.org/films/cosmos-laundromat/

“Harbor Lights” episodes and the live demo channels are short excerpts of the films above (the first 150 seconds, looped), unmodified apart from trimming and re-encoding.

Posters

Film	File	License	Author (as given on Commons)	Source
Big Buck Bunny	posters/big-buck-bunny.jpg	CC BY 3.0	(c) copyright Blender Foundation / peach.blender.org	https://commons.wikimedia.org/wiki/File:Big_buck_bunny_poster_big.jpg
Elephants Dream	posters/elephants-dream.jpg	CC BY 4.0	Bassam Kurdali, Andy Goralczyk, and the Blender Foundation	https://commons.wikimedia.org/wiki/File:ElephantsDreamPoster.jpg
Sintel	posters/sintel.jpg	CC BY 3.0	(c) copyright Blender Foundation / durian.blender.org	https://commons.wikimedia.org/wiki/File:Sintel_poster.jpg
Tears of Steel	posters/tears-of-steel.jpg	CC BY 3.0	(CC) Blender Foundation / Project Mango	https://commons.wikimedia.org/wiki/File:Tos-poster.png
Cosmos Laundromat	posters/cosmos-laundromat.jpg	CC BY 4.0	Andy Goralczyk and the Blender Foundation	https://commons.wikimedia.org/wiki/File:CosmosLaundromatPoster.jpg
Harbor Lights (fictional)	posters/harbor-lights.png	generated	Zapline	build_demo.py

Posters are 960 px thumbnails of the Wikimedia Commons originals; the Tears of Steel PNG was re-encoded to JPEG. Plain-text version: CREDITS.md.

Other open-source components

The app also uses AndroidX / Jetpack (including Media3 and Room), Kotlin and kotlinx libraries, Ktor, OkHttp and Okio, Coil, Koin, MaterialKolor, Haze, Compose Shimmer, Reorderable and SQLite. Their licenses are listed in the app under Settings → Credits.