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v4l-utils is a collection of various video4linux (V4L) and DVB utilities. libv4l is an accompanying collection of libraries that adds a thin abstraction layer on top of video4linux2 (V4L2) devices. The purpose of this layer is to make it easy for application writers to support a
wide variety of devices without having to write separate code for different devices in the same class. It consists of 3 different libraries. libv4lconvert offers functions to convert from any (known) pixel format to V4l2_PIX_FMT_BGR24 or V4l2_PIX_FMT_YUV420. libv4l1 offers the (deprecated) v4l1 API on top of v4l2 devices, independent of the drivers for those devices
supporting v4l1 compatibility (which many v4l2 drivers do not). libv4l2 offers the v4l2 API on top of v4l2 devices, while adding support for the application transparent libv4lconvert conversion where necessary.

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2011-07-27 05:58
0.8.5

V4L2 - CTL，添加新的掩码控制类型和控制事件的支持，连同小的错误修正。 qv4l2获得支持位图控制。增加了一个新的解析器em28xx转储与drxk前端。在libv4l，增加一些更多的笔记本电脑型号作了向下设备表，支持实施SE401像素格式和软件autogain调整的好处。其他一些小的改动。
标签: Stable, Minor feature enhancements, Minor bugfixes
In v4l2-ctl, support was added for the new bitmask control type and for the control event, along with small bugfixes. qv4l2 gained support for bitmap controls. A new parser for dumps of em28xx with the drxk frontend was added. In libv4l, some more laptop models were added to the upside down devices table, support for the SE401 pixel format was implemented, and software autogain tweaks were made. Several other minor changes were made.

2011-06-13 19:25
0.8.4

到libv4l各种增强了言，同时大大缩短CPU的高清摄像机与紫外线的几个情景使用率。图书馆是一个实验增加了相互关联的视频，音频，VBI的，和其他设备，允许应用程序，例如，自动找出哪些ALSA的输入设备进行相应的特定的音频视频设备。还有更多的笔记本电脑模型，添加到设备的上部向下表。为M420，Y10B和JPGL像素格式支持加入。利用JPEG解压缩代码被重写速度。许多进一步的改进和修复了。
标签: Stable, Minor bugfixes, Minor feature enhancements
Various enhancements to libv4l were made, resulting in significantly less CPU usage with UVC HD cameras in several scenarios. An experimental library was added for associating video, audio, vbi, and other devices with each other, allowing apps, for example, to automatically figure out which ALSA input device carries the audio for a specific corresponding video device. Many more laptop models were added to the table of upside down devices. Support for the M420, Y10B, and JPGL pixel formats was added. The JPEG decompression code was rewritten for speed. Many further enhancements and fixes were made.

2010-09-05 05:01
0.8.1

还有更多的笔记本电脑模型，添加到设备桌子弄下来。短帧现已被发现，和最多三个发起的重试获得非短帧。拥有超过16帧大小紫外线相机现在适当的支持。为Xirlink的C -它YYVYUY格式和柯尼卡YUV420格式支持增加了。在工具，各种为v41 -键表的改善和各种qv4l2修复了，和v412 - CTL的上涨对S / g_dv_timings支持。
标签: Stable, Minor feature enhancements, Minor bugfixes
Many more laptop models were added to the upside down devices table. Short frames are now detected, and up to three retries are initiated to get a non short frame. UVC cameras with more than 16 frame sizes are now properly supported. Support for the Xirlink C-It YYVYUY format and for the Konica YUV420 format were added. In the tools, various v4l-keytable improvements and various qv4l2 fixes were made, and v4l2-ctl gained support for s/g_dv_timings.

2010-05-08 00:52
0.8.0

对为v41 - utils的新组合和libv4l现在是稳定的。各种为v41 -键表的改善，的V4L2 - CTL的修复，修复和qv4l2已作出。还有更多的笔记本电脑模型已经被添加到倒置的设备清单。一些小的错误修正已经作出。
标签: Stable, Minor feature enhancements, Minor bugfixes
The new combination of v4l-utils and libv4l is now stable. Various v4l-keytable improvements, v4l2-ctl fixes, and qv4l2 fixes have been made. Many more laptop models have been added to the list of upside-down devices. Some minor bugfixes have been made.

2010-03-15 06:10
0.7.91

结合这一发展释放了v4l的事业，如为v41的DVB与纳入一个共同的分布比前libv4l utils的善变的内核。为v41 - keytable已更名为红外keytable，现在更好的支持红外。 libv4l添加了几个笔记本电脑型号，它们是倒置列表式设备。原相的JPEG去除标记是固定的。在白平衡以及各sonixj和sonixb的凸轮伽玛默认得到改善。伽玛校正现在已经启用的基础上pac7302凸轮的默认。转换流的前几帧的错误，现在被忽略。
标签: Development, Major feature enhancements
This development release combines utilities from the v4l-dvb mercurial kernel as v4l-utils with the previous libv4l into a common distribution. v4l-keytable has been renamed to ir-keytable, and now better supports IR. libv4l adds several laptop models to the list of upside-down devices. Pixart JPEG markers removal was fixed. The whitebalance and gamma defaults of various sonixj and sonixb based cams were improved. Gamma correction is now enabled by default on pac7302 based cams. Convert errors in the first few frames of a stream are now ignored.

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