223a2c2a60
do_streamcopy() has a packet that gets zero-initialized first, then gets initialized via av_init_packet() after which some of its fields are oerwritten again with the actually desired values (unless it's EOF): The side data is copied into the packet with av_copy_packet_side_data() and if the source packet is refcounted, the packet will get a new reference to the source packet's data. Furthermore, the flags are copied and the timestamp related fields are overwritten with new values. This commit replaces this by using av_packet_ref() to both initialize the packet as well as populate its fields with the right values (unless it's EOF again in which case the packet will still be initialized). The differences to the current approach are as follows: a) There is no call to a deprecated function (av_copy_packet_side_data()) any more. b) Several fields that weren't copied before are now copied from the source packet to the new packet (e.g. pos). Some of them (the timestamp related fields) may be immediately overwritten again and some don't seem to be used at all (e.g. pos), but in return using av_packet_ref() allows to forgo the initializations. c) There was no check for whether copying side data fails or not. This has been changed: Now the program is exited in this case. Using av_packet_ref() does not lead to unnecessary copying of data, because the source packets are already always refcounted (they originate from av_read_frame()). Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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 analysis 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
Coding examples are available in the doc/examples directory.
License
FFmpeg codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.
Contributing
Patches should be submitted to the ffmpeg-devel mailing list using
git format-patch or git send-email. Github pull requests should be
avoided because they are not part of our review process and will be ignored.