Acronyms| CL | "Change List" | | LGTM | "Looks good to me", commonly used to approve a code review. | | LKGR | "Last known good revision", the last build that passed a minimal set of tests on the buildbots. | | SGTM | "Sounds good to me" | | ToT | "Tip of Tree", as in the latest revision. |
Building| buildbot | A column in the build waterfall, or the slave (machine) connected to that column, or the build waterfall infrastructure as a whole. | | slave | A machine connected to the buildbot master, running a sequence of build and test steps. | | tryserver | A machine that runs a subset of all tests on all platforms. | | sheriff | The person currently charged with watching over the build waterfall to make sure it stays green (not failing). There are usually two sheriffs at one time. The current sheriffs can be seen in the upper left corner of the waterfall page. | | tree | This means the source tree in subversion. Often used in the context of "the tree is closed" meaning commits are currently disallowed. | | clobber | To delete your build output directory. | | land | Landing a patch means to commit it. | | try | To try a patch means to submit it to the tryserver before committing. | | waterfall | The page showing the status of all the buildbots. |
General| Flakiness | Intermittent test failures (including crashes and hangs), often caused by a poorly written test. | | Jank/Jankiness | User-perceptible UI lag. |
Video| channels | The number of audio channels present. We use "mono" to refer to 1 channel, "stereo" to refer to 2 channels, and "multichannel" to refer to 3+ channels. | | clicking | Audio artifacts caused by bad/corrupted samples. | | corruption | Visible video decoding artifacts. Usually a result of decoder error or seeking without fully flushing decoder state. Looks similar to this. | | FFmpeg | The open source library Chromium uses for decoding audio and video files. | | sample | A single uncompressed audio unit. Changes depending on the format but is typically a signed 16-bit integer. | | sample bits | The number of bits per audio sample. Typical values are 8, 16, 24 or 32. | | sample rate | The number of audio samples per second. Typical values for compressed audio formats (AAC/MP3/Vorbis) are 44.1 kHz or 48 kHz. | | stuttering | Short video or audio pauses. Makes the playback look/sound jerky, and is often caused by insufficient data or processor. | | sync | Audio/video synchronization. |
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