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As of September 14 2012, v4l_enumstd() will return ENODATA when a device's std field is set to 0. That is, the device does not have a standard format. In order to properly handle this case, v4l2_set_parameters should catch the ENODATA code and break instead of failing. Below is the v4l2-core commit describing this change. >>commit a5338190efc7cfa8c99a6856342a77d21c9a05cf >>Author: Hans Verkuil <hans.verkuil@cisco.com> >>Date: Fri Sep 14 06:45:43 2012 -0300 >> >> [media] v4l2-core: tvnorms may be 0 for a given input, handle that case >> >> Currently the core code looks at tvnorms to see whether ENUMSTD >> or G_PARM should be enabled. This is not a good check for drivers >> that support the STD API on one input and the DV Timings API on another. >> In that case tvnorms may be 0. >> Instead check whether s_std is present (for ENUMSTD) or whether g_std or >> current_norm is present for g_parm. >> Also, in the enumstd core function return ENODATA if tvnorms is 0, >> because in that case the current input does not support the STD API >> and ENUMSTD should return ENODATA for that. >> >> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> >> Reviewed-by: Sakari Ailus <sakari.ailus@iki.fi> >> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
FFmpeg README
FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.
Libraries
libavcodecprovides implementation of a wider range of codecs.libavformatimplements streaming protocols, container formats and basic I/O access.libavutilincludes hashers, decompressors and miscellaneous utility functions.libavfilterprovides a mean to alter decoded Audio and Video through chain of filters.libavdeviceprovides an abstraction to access capture and playback devices.libswresampleimplements audio mixing and resampling routines.libswscaleimplements color conversion and scaling routines.
Tools
- ffmpeg is a command line toolbox to manipulate, convert and stream multimedia content.
- ffplay is a minimalistic multimedia player.
- ffprobe is a simple analisys tool to inspect multimedia content.
- Additional small tools such as
aviocat,ismindexandqt-faststart.
Documentation
The offline documentation is available in the doc/ directory.
The online documentation is available in the main website and in the wiki.
Examples
Conding examples are available in the doc/example directory.
License
FFmpeg codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.