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Types and functions for working with AVPacket. More...

Data Structures

struct  AVPacketSideData
struct  AVPacket
 This structure stores compressed data. More...


#define AV_PKT_FLAG_KEY   0x0001
 The packet contains a keyframe. More...
#define AV_PKT_FLAG_CORRUPT   0x0002
 The packet content is corrupted. More...
#define AV_PKT_FLAG_DISCARD   0x0004
 Flag is used to discard packets which are required to maintain valid decoder state but are not required for output and should be dropped after decoding. More...
#define AV_PKT_FLAG_TRUSTED   0x0008
 The packet comes from a trusted source. More...


enum  AVPacketSideDataType {


AVPacketav_packet_alloc (void)
 Allocate an AVPacket and set its fields to default values. More...
AVPacketav_packet_clone (const AVPacket *src)
 Create a new packet that references the same data as src. More...
void av_packet_free (AVPacket **pkt)
 Free the packet, if the packet is reference counted, it will be unreferenced first. More...
void av_init_packet (AVPacket *pkt)
 Initialize optional fields of a packet with default values. More...
int av_new_packet (AVPacket *pkt, int size)
 Allocate the payload of a packet and initialize its fields with default values. More...
void av_shrink_packet (AVPacket *pkt, int size)
 Reduce packet size, correctly zeroing padding. More...
int av_grow_packet (AVPacket *pkt, int grow_by)
 Increase packet size, correctly zeroing padding. More...
int av_packet_from_data (AVPacket *pkt, uint8_t *data, int size)
 Initialize a reference-counted packet from av_malloc()ed data. More...
attribute_deprecated int av_dup_packet (AVPacket *pkt)
int av_copy_packet (AVPacket *dst, const AVPacket *src)
 Copy packet, including contents. More...
int av_copy_packet_side_data (AVPacket *dst, const AVPacket *src)
 Copy packet side data. More...
attribute_deprecated void av_free_packet (AVPacket *pkt)
 Free a packet. More...
uint8_tav_packet_new_side_data (AVPacket *pkt, enum AVPacketSideDataType type, int size)
 Allocate new information of a packet. More...
int av_packet_add_side_data (AVPacket *pkt, enum AVPacketSideDataType type, uint8_t *data, size_t size)
 Wrap an existing array as a packet side data. More...
int av_packet_shrink_side_data (AVPacket *pkt, enum AVPacketSideDataType type, int size)
 Shrink the already allocated side data buffer. More...
uint8_tav_packet_get_side_data (const AVPacket *pkt, enum AVPacketSideDataType type, int *size)
 Get side information from packet. More...
attribute_deprecated int av_packet_merge_side_data (AVPacket *pkt)
attribute_deprecated int av_packet_split_side_data (AVPacket *pkt)
const char * av_packet_side_data_name (enum AVPacketSideDataType type)
uint8_tav_packet_pack_dictionary (AVDictionary *dict, int *size)
 Pack a dictionary for use in side_data. More...
int av_packet_unpack_dictionary (const uint8_t *data, int size, AVDictionary **dict)
 Unpack a dictionary from side_data. More...
void av_packet_free_side_data (AVPacket *pkt)
 Convenience function to free all the side data stored. More...
int av_packet_ref (AVPacket *dst, const AVPacket *src)
 Setup a new reference to the data described by a given packet. More...
void av_packet_unref (AVPacket *pkt)
 Wipe the packet. More...
void av_packet_move_ref (AVPacket *dst, AVPacket *src)
 Move every field in src to dst and reset src. More...
int av_packet_copy_props (AVPacket *dst, const AVPacket *src)
 Copy only "properties" fields from src to dst. More...
void av_packet_rescale_ts (AVPacket *pkt, AVRational tb_src, AVRational tb_dst)
 Convert valid timing fields (timestamps / durations) in a packet from one timebase to another. More...

Detailed Description

Types and functions for working with AVPacket.

Macro Definition Documentation


Definition at line 1613 of file avcodec.h.

#define AV_PKT_FLAG_KEY   0x0001

The packet contains a keyframe.

Definition at line 1704 of file avcodec.h.

Referenced by a64multi_encode_frame(), ape_tag_read_field(), apng_read_packet(), asf_parse_packet(), asf_read_payload(), asf_read_picture(), asf_read_pts(), asf_read_timestamp(), asf_write_packet(), av_read_frame(), avcodec_encode_audio2(), avf_read_packet(), avi_read_packet(), avi_write_packet_internal(), avpriv_dv_produce_packet(), avs_read_audio_packet(), avs_read_video_packet(), avui_encode_frame(), bmp_encode_frame(), cdxl_read_packet(), cine_read_packet(), cinepak_encode_frame(), compute_pkt_fields(), daala_gptopts(), dash_write_packet(), dc1394_read_packet(), decode_frame(), decode_frame_common(), dirac_gptopts(), dnxhd_encode_picture(), do_streamcopy(), do_video_out(), dump_extradata(), dv_extract_audio_info(), dvvideo_encode_frame(), ea_read_packet(), encode_frame(), encode_picture_ls(), encode_png(), ff_flac_parse_picture(), ff_id3v2_parse_apic(), ff_img_read_packet(), ff_mov_add_hinted_packet(), ff_mov_write_packet(), ff_mpv_encode_picture(), ff_rm_parse_packet(), ff_rm_retrieve_cache(), ff_subtitles_queue_insert(), ff_v4l2_buffer_avpkt_to_buf(), ff_v4l2_buffer_buf_to_avpkt(), ffm_read_packet(), ffm_write_packet(), fifo_thread_write_packet(), fits_encode_frame(), fits_read_packet(), flashsv2_encode_frame(), flashsv_decode_frame(), flashsv_encode_frame(), flv_data_packet(), flv_read_packet(), flv_write_packet(), framecrc_write_packet(), gdv_read_packet(), get_attachment(), get_needed_flags(), gif_encode_frame(), gif_read_packet(), h263_handle_packet(), hap_encode(), hds_write_packet(), hls_read_packet(), hls_write_packet(), http_prepare_data(), idcin_read_packet(), iff_read_packet(), ism_write_packet(), libkvazaar_encode(), libopenjpeg_encode_frame(), libwebp_anim_encode_frame(), libwebp_encode_frame(), libx265_encode_frame(), ljpeg_encode_frame(), lmlm4_read_packet(), lvf_read_packet(), lxf_read_packet(), main(), matroska_parse_block(), matroska_read_header(), mkv_write_packet(), mkv_write_packet_internal(), modplug_read_packet(), mov_create_chapter_track(), mov_create_timecode_track(), mov_parse_vc1_frame(), mov_read_chapters(), mov_read_covr(), mov_read_packet(), mov_write_single_packet(), mpeg_mux_write_packet(), mpegts_write_flush(), mpegts_write_packet_internal(), msnwc_tcp_read_packet(), mux_frames(), mv_read_packet(), ndi_set_audio_packet(), ndi_set_video_packet(), nsv_read_chunk(), nut_write_packet(), nuv_packet(), ogg_read_packet(), ogg_read_timestamp(), ogg_validate_keyframe(), ogg_write_packet_internal(), ogm_packet(), old_dirac_gptopts(), omx_encode_frame(), pam_encode_frame(), parse_packet(), pcx_encode_frame(), pkt_dump_internal(), pnm_encode_frame(), process_output_surface(), prores_encode_frame(), put_payload_header(), qt_rtp_parse_packet(), qtrle_encode_frame(), raw_encode(), read_dst_frame(), read_frame(), read_frame_internal(), read_packet(), remove_extradata(), rm_write_audio(), rm_write_video(), roq_encode_frame(), rpl_read_packet(), sdr2_read_packet(), seek_frame_generic(), seg_write_packet(), show_packet(), siff_read_packet(), smush_read_packet(), storeframe(), sunrast_encode_frame(), sup_read_packet(), svc_encode_frame(), svq1_encode_frame(), targa_encode_frame(), theora_gptopts(), tmv_read_packet(), utvideo_encode_frame(), v308_encode_frame(), v408_encode_frame(), v410_encode_frame(), vaapi_encode_output(), vc1t_read_packet(), vc1test_write_packet(), vid_read_packet(), decklink_input_callback::VideoInputFrameArrived(), vp8_gptopts(), vp8_handle_packet(), vtenc_cm_to_avpacket(), webm_clusters_start_with_keyframe(), wrapped_avframe_encode(), write_timestamp(), X264_frame(), XAVS_frame(), xbm_encode_frame(), xface_encode_frame(), xmv_fetch_video_packet(), xvid_encode_frame(), xwd_encode_frame(), y41p_encode_frame(), yop_read_packet(), yuv4_encode_frame(), and zerocodec_decode_frame().

#define AV_PKT_FLAG_CORRUPT   0x0002
#define AV_PKT_FLAG_DISCARD   0x0004

Flag is used to discard packets which are required to maintain valid decoder state but are not required for output and should be dropped after decoding.

Definition at line 1711 of file avcodec.h.

Referenced by ff_init_buffer_info(), initializations(), mov_read_packet(), and show_packet().

#define AV_PKT_FLAG_TRUSTED   0x0008

The packet comes from a trusted source.

Otherwise-unsafe constructs such as arbitrary pointers to data outside the packet may be followed.

Definition at line 1718 of file avcodec.h.

Referenced by kmsgrab_read_packet(), and wrapped_avframe_decode().

Enumeration Type Documentation


An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE bytes worth of palette.

This side data signals that a new palette is present.


The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format that the extradata buffer was changed and the receiving side should act upon it appropriately.

The new extradata is embedded in the side data buffer and should be immediately used for processing the current frame or packet.


An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:

u32le param_flags
s32le channel_count
u64le channel_layout
s32le width
s32le height

An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of structures with info about macroblocks relevant to splitting the packet into smaller packets on macroblock edges (e.g.

as for RFC 2190). That is, it does not necessarily contain info about all macroblocks, as long as the distance between macroblocks in the info is smaller than the target payload size. Each MB info structure is 12 bytes, and is laid out as follows:

u32le bit offset from the start of the packet
u8 current quantizer at the start of the macroblock
u8 GOB number
u16le macroblock address within the GOB
u8 horizontal MV predictor
u8 vertical MV predictor
u8 horizontal MV predictor for block number 3
u8 vertical MV predictor for block number 3

This side data should be associated with an audio stream and contains ReplayGain information in form of the AVReplayGain struct.


This side data contains a 3x3 transformation matrix describing an affine transformation that needs to be applied to the decoded video frames for correct presentation.

See libavutil/display.h for a detailed description of the data.


This side data should be associated with a video stream and contains Stereoscopic 3D information in form of the AVStereo3D struct.


This side data should be associated with an audio stream and corresponds to enum AVAudioServiceType.


This side data contains quality related information from the encoder.

u32le quality factor of the compressed frame. Allowed range is between 1 (good) and FF_LAMBDA_MAX (bad).
u8 picture type
u16 reserved
u64le[error count] sum of squared differences between encoder in and output

This side data contains an integer value representing the stream index of a "fallback" track.

A fallback track indicates an alternate track to use when the current track can not be decoded for some reason. e.g. no decoder available for codec.


This side data corresponds to the AVCPBProperties struct.


Recommmends skipping the specified number of samples.

u32le number of samples to skip from start of this packet
u32le number of samples to skip from end of this packet
u8 reason for start skip
u8 reason for end skip (0=padding silence, 1=convergence)

An AV_PKT_DATA_JP_DUALMONO side data packet indicates that the packet may contain "dual mono" audio specific to Japanese DTV and if it is true, recommends only the selected channel to be used.

u8 selected channels (0=mail/left, 1=sub/right, 2=both)

A list of zero terminated key/value strings.

There is no end marker for the list, so it is required to rely on the side data size to stop.


Subtitle event position.

u32le x1
u32le y1
u32le x2
u32le y2

Data found in BlockAdditional element of matroska container.

There is no end marker for the data, so it is required to rely on the side data size to recognize the end. 8 byte id (as found in BlockAddId) followed by data.


The optional first identifier line of a WebVTT cue.


The optional settings (rendering instructions) that immediately follow the timestamp specifier of a WebVTT cue.


A list of zero terminated key/value strings.

There is no end marker for the list, so it is required to rely on the side data size to stop. This side data includes updated metadata which appeared in the stream.


MPEGTS stream ID, this is required to pass the stream ID information from the demuxer to the corresponding muxer.


Mastering display metadata (based on SMPTE-2086:2014).

This metadata should be associated with a video stream and contains data in the form of the AVMasteringDisplayMetadata struct.


This side data should be associated with a video stream and corresponds to the AVSphericalMapping structure.


Content light level (based on CTA-861.3).

This metadata should be associated with a video stream and contains data in the form of the AVContentLightMetadata struct.


The number of side data elements (in fact a bit more than it).

This is not part of the public API/ABI in the sense that it may change when new side data types are added. This must stay the last enum value. If its value becomes huge, some code using it needs to be updated as it assumes it to be smaller than other limits.

Definition at line 1405 of file avcodec.h.


Definition at line 1720 of file avcodec.h.

Function Documentation

AVPacket* av_packet_alloc ( void  )

Allocate an AVPacket and set its fields to default values.

The resulting struct must be freed using av_packet_free().

An AVPacket filled with default values or NULL on failure.
this only allocates the AVPacket itself, not the data buffers. Those must be allocated through other means such as av_new_packet.
See Also
decode_audio.c, decode_video.c, encode_audio.c, and encode_video.c.

Definition at line 51 of file avpacket.c.

Referenced by apng_write_packet(), av_bsf_alloc(), av_packet_clone(), avcodec_open2(), decode_init(), extract_extradata_init(), ff_bsf_get_packet(), ff_reshuffle_raw_rgb(), gif_write_packet(), main(), and worker().

AVPacket* av_packet_clone ( const AVPacket src)

Create a new packet that references the same data as src.

This is a shortcut for av_packet_alloc()+av_packet_ref().

newly created AVPacket on success, NULL on error.
See Also

Definition at line 659 of file avpacket.c.

Referenced by main().

void av_packet_free ( AVPacket **  pkt)
void av_init_packet ( AVPacket pkt)

Initialize optional fields of a packet with default values.

Note, this does not touch the data and size members, which have to be initialized separately.

demuxing_decoding.c, muxing.c, transcode_aac.c, and transcoding.c.

Definition at line 33 of file avpacket.c.

Referenced by asf_read_stream_properties(), asf_read_timestamp(), av_get_packet(), av_interleaved_write_frame(), av_new_packet(), av_packet_move_ref(), av_packet_unref(), av_write_uncoded_frame_internal(), avcodec_encode_audio2(), avcodec_encode_video2(), avformat_find_stream_info(), avpriv_dv_produce_packet(), compute_crc_of_packets(), do_audio_out(), do_streamcopy(), do_subtitle_out(), do_video_out(), dv_extract_audio_info(), encode_frame(), encode_write_frame(), FDBPrepare(), ff_alloc_packet2(), ff_flac_parse_picture(), ff_id3v2_parse_apic(), ff_interleave_packet_per_dts(), ff_load_image(), ff_mov_add_hinted_packet(), ff_read_packet(), ff_rtp_finalize_packet(), ffmmal_decode(), fifo_basic_test(), fifo_overflow_drop_test(), fifo_write_header_err_tst(), fifo_write_packet(), filter(), filter_frame(), find_video_stream_info(), flac_read_timestamp(), flush_encoders(), hnm_read_header(), init_packet(), initializations(), lavfi_read_packet(), LLVMFuzzerTestOneInput(), main(), matroska_read_header(), mkv_write_header(), mov_write_subtitle_end_packet(), movie_push_frame(), mpegts_get_dts(), mpegts_write_packet_internal(), mpjpeg_read_packet(), mux_frames(), mxf_interleave_get_packet(), new_data_packet(), new_pes_packet(), packet_queue_put_nullpacket(), parse_packet(), process_input_packet(), qt_rtp_parse_packet(), read_frame_internal(), read_interval_packets(), reset_packet(), reset_packet_state(), rtp_mpegts_write_packet(), run_test(), signal_init_ts(), sp5x_decode_frame(), tdsc_decode_jpeg_tile(), video_decode(), video_decode_example(), decklink_input_callback::VideoInputFrameArrived(), vp8_lossy_decode_frame(), wc3_read_header(), worker(), write_audio_frame(), write_skip_frames(), write_video_frame(), and xvid_encode_init().

int av_new_packet ( AVPacket pkt,
int  size 

Allocate the payload of a packet and initialize its fields with default values.

sizewanted payload size
0 if OK, AVERROR_xxx otherwise

Definition at line 86 of file avpacket.c.

Referenced by aa_read_packet(), aac_parse_packet(), ac3_handle_packet(), amr_handle_packet(), amr_read_packet(), ape_read_packet(), asf_deinterleave(), asf_parse_packet(), asf_read_replicated_data(), asf_read_single_payload(), audio_read_packet(), avf_read_packet(), avisynth_read_packet_audio(), avisynth_read_packet_video(), avs_read_video_packet(), bmv_read_packet(), callback(), cdxl_read_packet(), cin_read_packet(), create_subcc_packet(), decode_frame(), dss_723_1_read_packet(), dss_sp_read_packet(), dump_extradata(), dxa_read_packet(), encode_frame(), fbdev_read_packet(), ff_alloc_packet2(), ff_h263_handle_packet(), ff_h264_handle_aggregated_packet(), ff_h264_handle_frag_packet(), ff_img_read_packet(), ff_raw_read_partial_packet(), ff_reshuffle_raw_rgb(), ff_rm_retrieve_cache(), ff_spdif_read_packet(), ff_subtitles_queue_insert(), ffm_read_packet(), fits_read_packet(), flic_read_packet(), fourxm_read_packet(), fsb_read_packet(), g723_1_read_packet(), gdigrab_read_packet(), genh_read_packet(), grab_read_packet(), h264_handle_packet(), hevc_handle_packet(), ilbc_read_packet(), imx_dump_header(), interleave_new_audio_packet(), latm_parse_packet(), lavfi_read_packet(), load_ipmovie_packet(), lxf_read_packet(), main(), matroska_parse_frame(), matroska_parse_rm_audio(), matroska_parse_webvtt(), matroska_read_header(), merge_superframe(), mjpeg2jpeg_filter(), mjpega_dump_header(), mmap_read_frame(), modplug_read_packet(), mov2textsub(), mp3_header_decompress(), mpa_robust_parse_packet(), mpc_read_packet(), mpeg_parse_packet(), mpegts_raw_read_packet(), ndi_set_audio_packet(), ndi_set_video_packet(), noise(), nuv_packet(), ogg_read_packet(), pulse_read_packet(), qdm2_restore_block(), qt_rtp_parse_packet(), read_frame(), read_packet(), read_packet_gme(), read_packet_openmpt(), recode_subtitle(), return_stored_frame(), rm_assemble_video_frame(), rm_read_audio_stream_info(), roq_read_packet(), rsd_read_packet(), rtp_parse_packet_internal(), s337m_read_packet(), sbg_read_packet(), sdr2_read_packet(), sds_read_packet(), seq_read_packet(), siff_read_packet(), smacker_read_packet(), store_packet(), str_read_packet(), supply_new_packets(), swf_read_packet(), text2movsub(), vaapi_encode_output(), vc2hq_handle_sequence_header(), vc2hq_mark_end_of_sequence(), videostream_cb(), vmd_read_packet(), vp9_raw_reorder_make_output(), vpk_read_packet(), vqf_read_packet(), wsaud_read_packet(), wv_read_packet(), xcbgrab_frame(), xiph_handle_packet(), and yop_read_packet().

void av_shrink_packet ( AVPacket pkt,
int  size 
int av_grow_packet ( AVPacket pkt,
int  grow_by 

Increase packet size, correctly zeroing padding.

grow_bynumber of bytes by which to increase the size of the packet

Definition at line 109 of file avpacket.c.

Referenced by alloc_and_copy(), append_packet_chunked(), encode_callback(), encode_frame(), ff_subtitles_queue_insert(), hevc_mp4toannexb_filter(), main(), and wv_read_packet().

int av_packet_from_data ( AVPacket pkt,
uint8_t data,
int  size 

Initialize a reference-counted packet from av_malloc()ed data.

pktpacket to be initialized. This function will set the data, size, buf and destruct fields, all others are left untouched.
dataData allocated by av_malloc() to be used as packet data. If this function returns successfully, the data is owned by the underlying AVBuffer. The caller may not access the data through other means.
sizesize of data in bytes, without the padding. I.e. the full buffer size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
0 on success, a negative AVERROR on error

Definition at line 152 of file avpacket.c.

Referenced by ff_rtp_finalize_packet(), main(), mpeg4_unpack_bframes_filter(), omx_encode_frame(), prepare_packet(), qt_rtp_parse_packet(), and rfc4175_finalize_packet().

attribute_deprecated int av_dup_packet ( AVPacket pkt)
This is a hack - the packet memory allocation stuff is broken. The packet is allocated if it was not really allocated.
Use av_packet_ref

Definition at line 253 of file avpacket.c.

Referenced by avcodec_encode_audio2(), avcodec_encode_video2(), avpacket_queue_put(), worker(), and write_packet().

int av_copy_packet ( AVPacket dst,
const AVPacket src 

Copy packet, including contents.

0 on success, negative AVERROR on fail

Definition at line 264 of file avpacket.c.

Referenced by aiff_write_packet(), apng_write_packet(), ff_subtitles_queue_read_packet(), flush_packet(), gif_write_packet(), mp3_write_packet(), read_thread(), webp_write_packet(), and write_packet().

int av_copy_packet_side_data ( AVPacket dst,
const AVPacket src 

Copy packet side data.

0 on success, negative AVERROR on fail

Definition at line 226 of file avpacket.c.

Referenced by copy_packet_data().

attribute_deprecated void av_free_packet ( AVPacket pkt)

Free a packet.

Use av_packet_unref
pktpacket to free

Definition at line 281 of file avpacket.c.

uint8_t* av_packet_new_side_data ( AVPacket pkt,
enum AVPacketSideDataType  type,
int  size 
int av_packet_add_side_data ( AVPacket pkt,
enum AVPacketSideDataType  type,
uint8_t data,
size_t  size 

Wrap an existing array as a packet side data.

typeside information type
datathe side data array. It must be allocated with the av_malloc() family of functions. The ownership of the data is transferred to pkt.
sizeside information size
a non-negative number on success, a negative AVERROR code on failure. On failure, the packet is unchanged and the data remains owned by the caller.

Definition at line 295 of file avpacket.c.

Referenced by av_packet_new_side_data(), extract_extradata_filter(), ff_mpv_encode_picture(), and setup_side_data_entry().

int av_packet_shrink_side_data ( AVPacket pkt,
enum AVPacketSideDataType  type,
int  size 

Shrink the already allocated side data buffer.

typeside information type
sizenew side information size
0 on success, < 0 on failure

Definition at line 569 of file avpacket.c.

Referenced by ff_mpv_encode_picture().

uint8_t* av_packet_get_side_data ( const AVPacket pkt,
enum AVPacketSideDataType  type,
int size 
attribute_deprecated int av_packet_merge_side_data ( AVPacket pkt)

Definition at line 398 of file avpacket.c.

Referenced by read_frame_internal(), and write_packet().

attribute_deprecated int av_packet_split_side_data ( AVPacket pkt)
const char* av_packet_side_data_name ( enum AVPacketSideDataType  type)

Definition at line 367 of file avpacket.c.

Referenced by print_pkt_side_data(), and setup_side_data_entry().

uint8_t* av_packet_pack_dictionary ( AVDictionary dict,
int size 

Pack a dictionary for use in side_data.

dictThe dictionary to pack.
sizepointer to store the size of the returned data
pointer to data if successful, NULL otherwise

Definition at line 509 of file avpacket.c.

Referenced by concat_read_packet(), and vorbis_update_metadata().

int av_packet_unpack_dictionary ( const uint8_t data,
int  size,
AVDictionary **  dict 

Unpack a dictionary from side_data.

datadata from side_data
sizesize of the data
dictthe metadata storage dictionary
0 on success, < 0 on failure

Definition at line 544 of file avpacket.c.

Referenced by add_metadata_from_side_data(), and show_packet().

void av_packet_free_side_data ( AVPacket pkt)

Convenience function to free all the side data stored.

All the other fields stay untouched.


Definition at line 270 of file avpacket.c.

Referenced by av_free_packet(), av_packet_copy_props(), av_packet_ref(), av_packet_unref(), and avcodec_decode_subtitle2().

int av_packet_ref ( AVPacket dst,
const AVPacket src 

Setup a new reference to the data described by a given packet.

If src is reference-counted, setup dst as a new reference to the buffer in src. Otherwise allocate a new buffer in dst and copy the data from src into it.

All the other fields are copied from src.

See Also
dstDestination packet
srcSource packet
0 on success, a negative AVERROR on error.

Definition at line 626 of file avpacket.c.

Referenced by add_to_pktbuf(), av_packet_clone(), avcodec_send_packet(), extract_extradata(), ff_interleave_add_packet(), ff_read_packet(), ffat_decode(), fifo_write_packet(), mediacodec_decode_frame(), mkv_write_packet(), qsv_decode_frame(), submit_packet(), svc_decode_frame(), tee_write_packet(), vp9_superframe_split_filter(), and write_packet().

void av_packet_unref ( AVPacket pkt)

Wipe the packet.

Unreference the buffer referenced by the packet and reset the remaining packet fields to their default values.

pktThe packet to be unreferenced.
demuxing_decoding.c, encode_audio.c, encode_video.c, filtering_audio.c, filtering_video.c, hw_decode.c, qsvdec.c, remuxing.c, transcode_aac.c, and transcoding.c.

Definition at line 617 of file avpacket.c.

Referenced by adp_read_packet(), adts_aac_read_packet(), adx_read_packet(), aiff_write_trailer(), amr_read_packet(), ape_read_packet(), append_packet_chunked(), asf_deinterleave(), asf_parse_packet(), asf_read_close(), asf_read_header(), asf_read_picture(), asf_read_pts(), asf_read_timestamp(), asf_reset_header(), asfrtp_parse_packet(), audio_read_packet(), av_bitstream_filter_filter(), av_copy_packet_side_data(), av_interleaved_write_frame(), av_packet_alloc(), av_packet_free(), av_packet_merge_side_data(), av_read_frame(), av_write_trailer(), avcodec_decode_subtitle2(), avcodec_encode_audio2(), avcodec_encode_video2(), avcodec_flush_buffers(), avcodec_receive_packet(), avcodec_send_packet(), avformat_find_stream_info(), avi_read_close(), avi_read_packet(), avisynth_read_packet_audio(), avisynth_read_packet_video(), avpacket_queue_flush(), avs_read_video_packet(), binkaudio_receive_frame(), bsf_list_filter(), bsfs_poll(), cdxl_read_packet(), cin_read_packet(), compute_crc_of_packets(), concat_read_packet(), copy_packet_data(), crystalhd_decode_packet(), crystalhd_receive_frame(), cuvid_output_frame(), decode_audio_frame(), decode_frame(), decode_simple_internal(), decoder_decode_frame(), decoder_destroy(), dfa_read_packet(), do_encode(), drop_dups(), dshow_read_close(), dss_723_1_read_packet(), dss_sp_read_packet(), dump_extradata(), dxa_read_packet(), ea_read_packet(), encode(), encode_audio_frame(), encode_frame(), encode_picture_ls(), estimate_timings_from_pts(), extract_extradata(), extract_packet_props(), failing_write_packet(), ff_decode_get_packet(), ff_frame_thread_free(), ff_img_read_packet(), ff_interleave_add_packet(), ff_interleave_packet_per_dts(), ff_load_image(), ff_qsv_enc_close(), ff_raw_read_partial_packet(), ff_read_packet(), ff_rm_free_rmstream(), ff_spdif_read_packet(), ff_subtitles_queue_clean(), ff_v4l2_buffer_buf_to_avpkt(), ffat_close_decoder(), ffat_decode(), ffat_decode_callback(), ffat_decode_flush(), ffm_read_packet(), ffmpeg_cleanup(), fifo_basic_test(), fifo_overflow_drop_test(), fifo_thread_recover(), fifo_thread_write_packet(), fifo_write_header_err_tst(), fifo_write_packet(), filter_packet(), find_video_stream_info(), fits_read_packet(), flac_read_timestamp(), flic_read_packet(), flush(), flush_encoders(), flush_packet(), flv_read_packet(), fourxm_read_packet(), free_message(), free_packet_buffer(), free_pkt_fifo(), free_playlist_list(), free_stream(), g723_1_read_packet(), gdv_read_packet(), gsm_read_packet(), h264_mp4toannexb_filter(), hevc_mp4toannexb_filter(), hls_read_packet(), hls_read_seek(), hnm_read_close(), http_prepare_data(), idcin_read_packet(), ilbc_read_packet(), imx_dump_header(), interleave_packet(), lavfi_read_packet(), libopus_encode(), load_ipmovie_packet(), lxf_read_packet(), main(), matroska_clear_queue(), matroska_parse_frame(), mediacodec_decode_close(), mediacodec_decode_flush(), mediacodec_decode_frame(), mjpeg2jpeg_filter(), mjpega_dump_header(), mkv_write_packet(), mkv_write_trailer(), mmap_read_frame(), modplug_read_packet(), mov2textsub(), mov_write_eac3_tag(), mov_write_subtitle_end_packet(), movie_push_frame(), mp3_queue_flush(), mp3lame_encode_frame(), mpa_robust_parse_packet(), mpc_read_packet(), mpc_read_seek(), mpeg4_unpack_bframes_filter(), mpegts_get_dts(), mpegts_raw_read_packet(), mpegts_read_packet(), mpjpeg_read_packet(), mxf_interleave_get_packet(), nc_read_packet(), noise(), nsv_read_close(), nuv_packet(), ogg_read_packet(), packet_queue_flush(), packet_queue_put(), parse_packet(), process_input(), qsv_clear_buffers(), qsv_decode_frame(), qt_rtp_parse_packet(), read_frame_internal(), read_interval_packets(), read_packet(), read_thread(), recode_subtitle(), redspark_read_packet(), reset_packet(), reset_packet_state(), rl2_read_packet(), rm_assemble_video_frame(), rm_read_packet(), roq_read_packet(), rpl_read_packet(), run_test(), s337m_read_packet(), sap_fetch_packet(), sdr2_read_packet(), seek_frame_generic(), seek_subtitle(), siff_read_packet(), storeframe(), str_read_close(), str_read_packet(), submit_packet(), svc_decode_close(), svc_decode_frame(), swf_read_packet(), text2movsub(), thp_read_packet(), tta_encode_frame(), vfw_read_close(), video_decode(), video_decode_example(), vivo_read_packet(), vmd_read_packet(), vp9_superframe_filter(), vpk_read_packet(), vqf_read_packet(), vtenc_frame(), wc3_read_close(), write_packet(), write_trailer(), wv_read_packet(), xiph_handle_packet(), xvid_encode_frame(), xvid_encode_init(), yop_read_close(), yop_read_packet(), yop_read_seek(), and yuv4_read_packet().

void av_packet_move_ref ( AVPacket dst,
AVPacket src 
int av_packet_copy_props ( AVPacket dst,
const AVPacket src 

Copy only "properties" fields from src to dst.

Properties for the purpose of this function are all the fields beside those related to the packet data (buf, data, size)

dstDestination packet
srcSource packet
0 on success AVERROR on failure.

Definition at line 585 of file avpacket.c.

Referenced by av_packet_ref(), dump_extradata(), extract_packet_props(), ff_reshuffle_raw_rgb(), h264_mp4toannexb_filter(), hevc_mp4toannexb_filter(), imx_dump_header(), mjpeg2jpeg_filter(), mjpega_dump_header(), mov2textsub(), mp3_header_decompress(), mpeg4_unpack_bframes_filter(), noise(), text2movsub(), and vp9_superframe_filter().

void av_packet_rescale_ts ( AVPacket pkt,
AVRational  tb_src,
AVRational  tb_dst 

Convert valid timing fields (timestamps / durations) in a packet from one timebase to another.

Timestamps with unknown values (AV_NOPTS_VALUE) will be ignored.

pktpacket on which the conversion will be performed
tb_srcsource timebase, in which the timing fields in pkt are expressed
tb_dstdestination timebase, to which the timing fields will be converted
muxing.c, and transcoding.c.

Definition at line 680 of file avpacket.c.

Referenced by do_audio_out(), do_video_out(), encode_write_frame(), fifo_thread_write_packet(), flush_encoders(), main(), tee_write_packet(), write_frame(), and write_packet().