90a356b29d
The root cause: - some MP4 files come with H.264/H.265 streams which explicitly state their timescale. In such cases, it is wise that MP4 muxer adopts these values - unfortunately, the recent trend has been that such values coming from video stream SPS (vui_parameters/timing info) are exorbitantly high - instead of being FPS *1000, they tend to be FPS * 100,000,000 - when trying to express the duration of the movie, the MP4 muxer normally tries to find the adequate timescale value which will fit both audio and video timescaling domains. The most suitable approach is that the LCM (least common multiplier) value is taken which mathematically will be the least disruptive. HOWEVER: - in cases when video and timescale numeric values are mutually 'odd', say 30*100,000,000 and 44100, the LCM ends up being a huge number, which outgrows the 32-bit storage capacity granted by the ISO MP4 spec (MVHD box). Problem solution: 1) identifying when the LCM timescale exceeds 32-bit storage space 2) scaling down its value by nearest larger 10X factor, which will guarantee its value fitting the 32-bit space. Given the afore mentioned video timescale factors, dividing by 10X is harmless 3) rescaling the duration 64-bit value based on the new timescale
Signal Android
Signal is a simple, powerful, and secure messenger.
Signal uses your phone's data connection (WiFi/3G/4G/5G) to communicate securely. Millions of people use Signal every day for free and instantaneous communication anywhere in the world. Send and receive high-fidelity messages, participate in HD voice/video calls, and explore a growing set of new features that help you stay connected. Signal’s advanced privacy-preserving technology is always enabled, so you can focus on sharing the moments that matter with the people who matter to you.
Currently available on the Play Store and signal.org.
Contributing Bug reports
We use GitHub for bug tracking. Please search the existing issues for your bug and create a new one if the issue is not yet tracked!
https://github.com/signalapp/Signal-Android/issues
Joining the Beta
Want to live life on the bleeding edge and help out with testing?
You can subscribe to Signal Android Beta releases here: https://play.google.com/apps/testing/org.thoughtcrime.securesms
If you're interested in a life of peace and tranquility, stick with the standard releases.
Contributing Code
If you're new to the Signal codebase, we recommend going through our issues and picking out a simple bug to fix in order to get yourself familiar. Also please have a look at the CONTRIBUTING.md, that might answer some of your questions.
For larger changes and feature ideas, we ask that you propose it on the unofficial Community Forum for a high-level discussion with the wider community before implementation.
Contributing Ideas
Have something you want to say about Signal projects or want to be part of the conversation? Get involved in the community forum.
Help
Support
For troubleshooting and questions, please visit our support center!
Documentation
Looking for documentation? Check out the wiki!
https://github.com/signalapp/Signal-Android/wiki
Legal things
Cryptography Notice
This distribution includes cryptographic software. The country in which you currently reside may have restrictions on the import, possession, use, and/or re-export to another country, of encryption software. BEFORE using any encryption software, please check your country's laws, regulations and policies concerning the import, possession, or use, and re-export of encryption software, to see if this is permitted. See http://www.wassenaar.org/ for more information.
The U.S. Government Department of Commerce, Bureau of Industry and Security (BIS), has classified this software as Export Commodity Control Number (ECCN) 5D002.C.1, which includes information security software using or performing cryptographic functions with asymmetric algorithms. The form and manner of this distribution makes it eligible for export under the License Exception ENC Technology Software Unrestricted (TSU) exception (see the BIS Export Administration Regulations, Section 740.13) for both object code and source code.
License
Copyright 2013-2025 Signal Messenger, LLC
Licensed under the GNU AGPLv3: https://www.gnu.org/licenses/agpl-3.0.html
Google Play and the Google Play logo are trademarks of Google LLC.