FFmpeg 7.1.1
|
Stream structure. More...
#include <libavformat/avformat.h>
Data Fields | |
const AVClass * | av_class |
A class for AVOptions. | |
int | index |
stream index in AVFormatContext | |
int | id |
Format-specific stream ID. | |
AVCodecParameters * | codecpar |
Codec parameters associated with this stream. | |
void * | priv_data |
AVRational | time_base |
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented. | |
int64_t | start_time |
Decoding: pts of the first frame of the stream in presentation order, in stream time base. | |
int64_t | duration |
Decoding: duration of the stream, in stream time base. | |
int64_t | nb_frames |
number of frames in this stream if known or 0 | |
int | disposition |
Stream disposition - a combination of AV_DISPOSITION_* flags. | |
enum AVDiscard | discard |
Selects which packets can be discarded at will and do not need to be demuxed. | |
AVRational | sample_aspect_ratio |
sample aspect ratio (0 if unknown) | |
AVDictionary * | metadata |
AVRational | avg_frame_rate |
Average framerate. | |
AVPacket | attached_pic |
For streams with AV_DISPOSITION_ATTACHED_PIC disposition, this packet will contain the attached picture. | |
int | event_flags |
Flags indicating events happening on the stream, a combination of AVSTREAM_EVENT_FLAG_*. | |
AVRational | r_frame_rate |
Real base framerate of the stream. | |
int | pts_wrap_bits |
Number of bits in timestamps. | |
Stream structure.
New fields can be added to the end with minor version bumps. Removal, reordering and changes to existing fields require a major version bump. sizeof(AVStream) must not be used outside libav*.
Definition at line 748 of file avformat.h.
const AVClass* AVStream::av_class |
int AVStream::index |
stream index in AVFormatContext
Definition at line 754 of file avformat.h.
Referenced by main(), and write_frame().
int AVStream::id |
Format-specific stream ID.
decoding: set by libavformat encoding: set by the user, replaced by libavformat if left unset
Definition at line 760 of file avformat.h.
Referenced by add_stream().
AVCodecParameters* AVStream::codecpar |
Codec parameters associated with this stream.
Allocated and freed by libavformat in avformat_new_stream() and avformat_free_context() respectively.
Definition at line 771 of file avformat.h.
Referenced by dec_enc(), dec_enc(), init_filters(), main(), main(), open_audio(), open_codec_context(), open_codec_context(), open_input_file(), open_input_file(), open_input_file(), open_input_file(), open_input_file(), open_input_file(), open_output_file(), open_output_file(), and open_video().
void* AVStream::priv_data |
Definition at line 773 of file avformat.h.
AVRational AVStream::time_base |
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
decoding: set by libavformat encoding: May be set by the caller before avformat_write_header() to provide a hint to the muxer about the desired timebase. In avformat_write_header(), the muxer will overwrite this field with the timebase that will actually be used for the timestamps written into the file (which may or may not be related to the user-provided one, depending on the format).
Definition at line 787 of file avformat.h.
Referenced by add_stream(), dec_enc(), dec_enc(), encode_write(), encode_write(), encode_write_frame(), get_audio_frame(), init_filters(), init_filters(), log_packet(), log_packet(), main(), open_input_file(), open_input_file(), open_input_file(), open_output_file(), open_output_file(), and write_frame().
int64_t AVStream::start_time |
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
Only set this if you are absolutely 100% sure that the value you set it to really is the pts of the first frame. This may be undefined (AV_NOPTS_VALUE).
Definition at line 797 of file avformat.h.
int64_t AVStream::duration |
Decoding: duration of the stream, in stream time base.
If a source file does not specify a duration, but does specify a bitrate, this value will be estimated from bitrate and file size.
Encoding: May be set by the caller before avformat_write_header() to provide a hint to the muxer about the estimated duration.
Definition at line 807 of file avformat.h.
int64_t AVStream::nb_frames |
number of frames in this stream if known or 0
Definition at line 809 of file avformat.h.
int AVStream::disposition |
Stream disposition - a combination of AV_DISPOSITION_* flags.
Definition at line 817 of file avformat.h.
enum AVDiscard AVStream::discard |
Selects which packets can be discarded at will and do not need to be demuxed.
Definition at line 819 of file avformat.h.
Referenced by main().
AVRational AVStream::sample_aspect_ratio |
sample aspect ratio (0 if unknown)
Definition at line 826 of file avformat.h.
AVDictionary* AVStream::metadata |
Definition at line 828 of file avformat.h.
AVRational AVStream::avg_frame_rate |
Average framerate.
Definition at line 837 of file avformat.h.
AVPacket AVStream::attached_pic |
For streams with AV_DISPOSITION_ATTACHED_PIC disposition, this packet will contain the attached picture.
decoding: set by libavformat, must not be modified by the caller. encoding: unused
Definition at line 846 of file avformat.h.
int AVStream::event_flags |
Flags indicating events happening on the stream, a combination of AVSTREAM_EVENT_FLAG_*.
Definition at line 891 of file avformat.h.
AVRational AVStream::r_frame_rate |
Real base framerate of the stream.
This is the lowest framerate with which all timestamps can be represented accurately (it is the least common multiple of all framerates in the stream). Note, this value is just a guess! For example, if the time base is 1/90000 and all frames have either approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
Definition at line 914 of file avformat.h.
int AVStream::pts_wrap_bits |
Number of bits in timestamps.
Used for wrapping control.
Definition at line 923 of file avformat.h.