Open Source & Licensing
TrimTok Multimedia Framework & Third-Party Notices
LGPL v3 Compliance Statement
TrimTok uses shared, dynamically-linked native multimedia libraries from the FFmpeg project, built under the terms of the GNU Lesser General Public License (LGPL) version 3.0. No GPL-only or proprietary non-free modules are included in our FFmpeg build configuration (configured with --disable-gpl --disable-nonfree --enable-version3 --enable-shared).
In accordance with Section 6 of the LGPL v3, we provide:
- Clear attribution to all open-source libraries used.
- Direct access to the exact source archives, build configurations, and patches used to compile the native shared libraries (
.sofiles). - Full freedom for developers and users to inspect, modify, rebuild, and relink the underlying multimedia libraries.
Download Native Source Package
Contains complete Android NDK build scripts, custom patches, and build instructions.
Third-Party Libraries & Licenses
| Library | Version | License | Upstream Website |
|---|---|---|---|
| FFmpeg | 7.1 | LGPL v3.0 | ffmpeg.org |
| LAME | 3.100 | LGPL v2.0+ | lame.sourceforge.io |
| libogg | 1.3.5 | BSD 3-Clause | xiph.org/ogg |
| libvorbis | 1.3.7 | BSD 3-Clause | xiph.org/vorbis |
| libopus | 1.5.2 | BSD 3-Clause | opus-codec.org |
Source Modifications & Patches
TrimTok applies a minimal patch to upstream FFmpeg 7.1 to support multiple in-process invocations inside Android's runtime environment:
- Multi-Execution Reset (
patches/ffmpeg-7.1-multi-exec.patch): Upstream FFmpeg CLI assumes a single run per OS process and does not clear global state on completion. The patch resets internal file and filtergraph counters (nb_input_files = 0,nb_output_files = 0,nb_filtergraphs = 0,nb_decoders = 0) insideffmpeg_cleanup()so consecutive conversion jobs execute safely within the app's single lifecycle without state corruption.
How to Rebuild the Native Libraries
You can reproduce and rebuild the exact native shared objects using the provided build package and Android NDK:
The build script fetches official release tarballs, verifies dependencies, compiles static audio codecs, and generates 16KB page-aligned shared libraries for arm64-v8a, armeabi-v7a, and x86_64.
Full License Texts
GNU Lesser General Public License (LGPL) Version 3.0
GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.
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As used herein, "this License" refers to version 3 of the GNU Lesser
General Public License, and the "GNU GPL" refers to version 3 of the GNU
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BSD 3-Clause License (libogg, libvorbis, libopus)
Copyright (c) 2002, Xiph.org Foundation
Copyright (c) 2002-2020, Xiph.org Foundation
Copyright (c) 2001-2023, Xiph.Org, Skype Limited, Octasic, Jean-Marc Valin,
Timothy B. Terriberry, CSIRO, Gregory Maxwell,
Mark Borgerding, Erik de Castro Lopo
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
- Neither the name of the Xiph.org Foundation nor the names of its
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this software without specific prior written permission.
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Written Offer & Inquiries
If you have any questions regarding TrimTok's open source compliance, or if you require an alternative method of receiving the corresponding source code, please contact us: