1、問題描述
使用ffmpeg庫寫程序，編譯時，經常報警告“xxx is deprecated”
查看源碼時，該接口或結構體字段被標記attribute_deprecated，表示它已經過時，不推薦使用。
如：
attribute_deprecated
void avcodec_register(AVCodec *codec);
attribute_deprecated
void avcodec_register_all(void);
2、以下列出截至 FFmpeg 4.2 Deprecate的接口
詳細內容請查看，FFmpeg源碼中doc/APIchanges文檔，該文檔記錄接口的變更：Add、Deprecate、Rename、Remove。
2018-04-03 - d6fc031caf - lavu 56.13.100 - pixdesc.h
Deprecate AV_PIX_FMT_FLAG_PSEUDOPAL
2018-04-01 - f1805d160d - lavfi 7.14.100 - avfilter.h
Deprecate use of avfilter_register(), avfilter_register_all(), avfilter_next().
2018-02-06 - 0694d87024 - lavf 58.9.100 - avformat.h
Deprecate use of av_register_input_format(), av_register_output_format(), av_register_all(), av_iformat_next(), av_oformat_next().
2018-02-06 - 36c85d6e77 - lavc 58.10.100 - avcodec.h
Deprecate use of avcodec_register(), avcodec_register_all(), av_codec_next(), av_register_codec_parser(), and av_parser_next().
2018-01-28 - ea3672b7d6 - lavf 58.7.100 - avformat.h
Deprecate AVFormatContext filename field which had limited length, use the new dynamically allocated url field instead.
2018-01-16 - 6512ff72f9 - lavf 58.4.100 - avformat.h
Deprecate AVStream.recommended_encoder_configuration. It was useful only for FFserver, which has been removed.
2018-01-05 - 798dcf2432 - lavfi 7.11.101 - avfilter.h
Deprecate avfilter_link_get_channels(). Use av_buffersink_get_channels().
2017-01-04 - c29038f304 - lavr 4.0.0 - avresample.h
Deprecate libavresample use libswresample.
2017-12-26 - a04c2c707d - lavc 58.9.100 - avcodec.h
Deprecate av_lockmgr_register().
2017-11-26 - 3536a3efb9 - lavc 58.5.100 - avcodec.h
Deprecate user visibility of the AVHWAccel structure and the functions av_register_hwaccel() and av_hwaccel_next().
2017-09-26 - b1cf151c4d - lavc 57.106.102 - avcodec.h
Deprecate AVCodecContext.refcounted_frames.
2017-03-21 - d682ae70b4 - lavf 57.66.105, lavc 57.83.101 - avformat.h, avcodec.h
Deprecate AVFMT_FLAG_KEEP_SIDE_DATA.
Deprecate av_packet_merge_side_data() and av_packet_split_side_data().
2017-03-18 - 3796fb2692 - lavfi 6.77.100 - avfilter.h
Deprecate AVFilterGraph.resample_lavr_opts
2017-01-17 - 2a4a8653b6 - lavc 57.74.100 - vaapi.h
Deprecate struct vaapi_context and the vaapi.h installed header.
Callers should set AVCodecContext.hw_frames_ctx instead.
2016-04-17 - af9cac1 / 33d1898 - lavc 57.35.100 / 57.15.0 - avcodec.h
Deprecate the old bitstream filtering API.
2016-04-11 - 6f69f7a / 9200514 - lavf 57.33.100 / 57.5.0 - avformat.h
Deprecate AVStream.codec.
2015-12-22 - 39a09e9 - lavfi 6.21.101 - avfilter.h
Deprecate avfilter_link_set_closed().
2015-10-29 - lavc 57.12.100 / 57.8.0 - avcodec.h
Deprecate av_free_packet() use av_packet_unref() instead
Deprecate av_dup_packet() use av_packet_ref() instead
2015-08-19 - 9f8e57ef - lavu 54.31.100 - pixfmt.h
Deprecate old VA-API related pixel formats: AV_PIX_FMT_VAAPI_MOCO, AV_PIX_FMT_VAAPI_IDCT, AV_PIX_FMT_VAAPI_VLD.
2015-02-14 - ba22295 - lavc 56.21.102
Deprecate VIMA decoder.
2014-10-13 - da21895 / 2df0c32e - lavc 56.5.100 / 56.3.0 - avcodec.h
Deprecate the use of AVCodecContext.delay for audio encoding.
2014-09-19 - 6edd6a4 - lavc 56.1.101 - dv_profile.h
deprecate avpriv_dv_frame_profile2(), which was made public by accident.
2014-08-08 - 3841f2a / d35b94f - lavc 55.73.102 / 55.57.4 - avcodec.h
Deprecate FF_IDCT_XVIDMMX define and xvidmmx idct option. Replaced by FF_IDCT_XVID and xvid respectively.
2014-08-08 - 5c3c671 - lavf 55.53.100 - avio.h
Deprecate url_feof().
2014-08-03 - 71d008e / 1ef9e83 - lavu 52.95.100 / 53.20.0 - frame.h
Deprecate AVCodecContext.dtg_active_format and use side-data instead.
2014-08-03 - 9400603 / 9f17685 - lavc 55.71.101 / 55.57.1 - avcodec.h
Deprecate unused FF_IDCT_IPP define and ipp avcodec option.
Deprecate unused FF_DEBUG_PTS define and pts avcodec option.
Deprecate unused FF_CODER_TYPE_DEFLATE define and deflate avcodec option.
Deprecate unused FF_DCT_INT define and int avcodec option.
Deprecate unused avcodec option scenechange_factor.
2014-05-19 - 999a99c / a312f71 - lavf 55.38.101 / 55.17.1 - avformat.h
Deprecate AVStream.pts and the AVFrac struct
2014-05-01 - e77b985 / a2941c8 - lavc 55.60.103 / 55.50.3 - avcodec.h
Deprecate CODEC_FLAG_MV0.
2014-05-01 - e40ae8c / 6484149 - lavc 55.60.102 / 55.50.2 - avcodec.h
Deprecate CODEC_FLAG_GMC.
2014-05-01 - 1851643 / b2c3171 - lavc 55.60.101 / 55.50.1 - avcodec.h
Deprecate CODEC_FLAG_NORMALIZE_AQP
2014-05-01 - cac07d0 / 5fcceda - avcodec.h
Deprecate CODEC_FLAG_INPUT_PRESERVED.
2014-04-30 - 617e866 - lavu 52.81.100 - pixdesc.h
Deprecate avcodec_get_pix_fmt_loss(), avcodec_find_best_pix_fmt_of_2()
2014-02-19 - f4c8d00 / 6bb8720 - lavu 52.64.101 / 53.3.1 - opt.h
Deprecate unused AV_OPT_FLAG_METADATA.
2014-01-20 - eef74b2 / 93c553c - lavc 55.48.102 / 55.32.1 - avcodec.h
Deprecate CODEC_FLAG_EMU_EDGE and avcodec_get_edge_width().
2013-11-14 - b71e4d8 / 8941971 - lavc 55.43.100 / 55.27.0 - avcodec.h
Deprecate AVCodecContext.error_rate.
2013-08-05 - 9547e3e / f824535 - lavc 55.22.100 / 55.13.0 - avcodec.h
Deprecate the bitstream-related members from struct AVVDPAUContext.
2013-08-05 - 3b805dc / 549294f - lavc 55.21.100 / 55.12.0 - avcodec.h
Deprecate the CODEC_CAP_HWACCEL_VDPAU codec capability. Use CODEC_CAP_HWACCEL
and select the AV_PIX_FMT_VDPAU format with get_format() instead.
2013-08-05 - 4ee0984 / a0ad5d0 - lavu 52.41.100 / 52.14.0 - pixfmt.h
Deprecate AV_PIX_FMT_VDPAU_*. Use AV_PIX_FMT_VDPAU instead.
2013-07-03 - 838bd73 - lavfi 3.78.100 - avfilter.h
Deprecate avfilter_graph_parse() in favor of the equivalent avfilter_graph_parse_ptr().
2013-04-11 - lavfi 3.53.100 / 3.8.0
Deprecate avfilterhraph.h use avfilter.h instead
Deprecate avfilter_open() and avfilter_graph_add_filter().
Deprecate avfilter_init_filter().
Deprecate av_filter_next().
Deprecate avfilter_uninit().
2013-03-16 - ecade98 / 42c7c61 - lavfi 3.47.100 / 3.6.0
Deprecate AVFilterGraph.filter_count.
2013-03-08 - Reference counted buffers - lavu 52.8.0, lavc 55.0.100 / 55.0.0, lavf 55.0.100 / 55.0.0,
lavd 54.4.100 / 54.0.0, lavfi 3.5.0
Deprecate AVCodecContext.get_buffer() / release_buffer() /
reget_buffer(), avcodec_default_get_buffer(),
avcodec_default_reget_buffer(), avcodec_default_release_buffer().
Remove avcodec_default_free_buffers(), which should not have ever
been called from outside of lavc.
Deprecate the following AVFrame fields:
* base -- is now stored in AVBufferRef
* reference, type, buffer_hints -- are unnecessary in the new API
* hwaccel_picture_private, owner, thread_opaque -- should not
have been accessed from outside of lavc
* qscale_table, qstride, qscale_type, mbskip_table, motion_val,
mb_type, dct_coeff, ref_index -- mpegvideo-specific tables,
which are not exported anymore.
a05a44e / 7e35037 - Deprecate av_buffersrc_buffer().
deprecate av_buffersink_read() and av_buffersink_read_samples().
Deprecate AVFilterBufferRef and all functions for working with it.
2012-12-29 - lavu 52.13.100 / 52.3.0 - avstring.h
deprecate avcodec_get_chroma_sub_sample.
2012-06-12 - c7b9eab / 9baeff9 - lavfi 2.79.100 / 2.23.0 - avfilter.h
Deprecate AVFilterContext.input/output_count.
2012-05-15 - lavfi 2.74.100 / 2.17.0 1cbf7fb / 720c6b7 -
Deprecate av_vsrc_buffer_add_frame()
2012-03-20 - 0ebd836 / 3c90cc2 - lavfo 54.2.0
Deprecate av_read_packet(), use av_read_frame() with
AVFMT_FLAG_NOPARSE | AVFMT_FLAG_NOFILLIN in AVFormatContext.flags
2012-02-08 - f2b20b7 / 52f82a1 - lavc 54.2.100 / 54.1.0
Deprecate avcodec_encode_video().
2012-01-15 - lavc 53.56.105 / 53.34.0
deprecate avcodec_encode_audio().
2011-12-18 - 7c29313 / 8400b12 - lavc 53.46.1 / 53.28.1
Deprecate AVFrame.age.
2011-12-12 - 8bc7fe4 / 5266045 - lavf 53.25.0 / 53.17.0
Deprecate av_close_input_file() and av_close_input_stream().
2011-12-02 - e4de716 / 0eea212 - lavc 53.40.0 / 53.25.0
Deprecate AVCODEC_MAX_AUDIO_FRAME_SIZE.
Deprecate avcodec_decode_audio3() in favor of avcodec_decode_audio4().
avcodec_decode_audio4() writes output samples to an AVFrame, which allows
audio decoders to use get_buffer().
2011-10-27 - 6faf0a2 / 512557b - lavc 53.24.0 / 53.15.0
Remove avcodec_parse_frame.
Deprecate AVCodecContext.parse_only and CODEC_CAP_PARSE_ONLY.
2011-10-19 - d049257 / 569129a - lavf 53.17.0 / 53.10.0
Deprecate av_new_stream().
2011-09-06 - c4415f6 - lavfi 2.38.0
deprecate av_vsink_buffer_get_video_buffer_ref()
2011-08-14 - 323b930 - lavu 51.12.0
deprecate av_fifo_peek().
2011-07-10 - 3602ad7 / a67c061 - lavf 53.6.0
deprecate av_find_stream_info().
2011-07-10 - 3602ad7 / 0b950fe - lavc 53.8.0
deprecate avcodec_open().
Deprecate avcodec_alloc_context() and avcodec_alloc_context2().
2011-06-16 - 2905e3f / 05e84c9, 2905e3f / 25de595 - lavf 53.4.0 / 53.2.0 - avformat.h
Deprecate av_open_input_stream, av_open_input_file, AVFormatParameters and av_write_header.
2011-06-16 - 2905e3f / 7e83e1c, 2905e3f / dc59ec5 - lavu 51.9.0 / 51.7.0 - opt.h
Deprecate av_find_opt().
2011-06-07 - d552f61 / a6703fa - lavu 51.8.0 - av_get_bytes_per_sample()
Deprecate av_get_bits_per_sample_fmt().
2011-05-28 - e71f260 - lavu 51.3.0 - pixdesc.h
deprecate avcodec_get_pix_fmt_name()
2011-05-22 - 5ecdfd0 - lavf 53.2.0 - avformat.h
eprecate avformat_alloc_output_context().
2011-05-10 - 59eb12f / 188dea1 - lavc 53.6.0 - avcodec.h
Deprecate AVLPCType and the following fields in AVCodecContext:
lpc_coeff_precision, prediction_order_method,
min_partition_order, max_partition_order, lpc_type, lpc_passes.
Corresponding FLAC encoder options should be used instead.
2011-04-26 - d7e5aeb / bebe72f - lavu 51.1.0 - avutil.h
deprecate FF_*_TYPE defines and av_get_pict_type_char() defined in libavcodec/avcodec.h.
2011-04-12 - lavf 52.107.0 - avio.h
Avio cleanup, part II - deprecate the entire URLContext API:
c55780d / 175389c add avio_check as a replacement for url_exist
9891004 / ff1ec0c add avio_pause and avio_seek_time as replacements
for _av_url_read_fseek/fpause
d4d0932 / cdc6a87 deprecate av_protocol_next(), avio_enum_protocols
should be used instead.
c88caa5 / 80c6e23 rename url_set_interrupt_cb->avio_set_interrupt_cb.
c88caa5 / f87b1b3 rename open flags: URL_* -> AVIO_*
d4d0932 / 5593f03 deprecate URLProtocol.
d4d0932 / c486dad deprecate URLContext.
d4d0932 / 026e175 deprecate the typedef for URLInterruptCB
c88caa5 / 8e76a19 deprecate av_register_protocol2.
11d7841 / b840484 deprecate URL_PROTOCOL_FLAG_NESTED_SCHEME
11d7841 / 1305d93 deprecate av_url_read_seek
11d7841 / fa104e1 deprecate av_url_read_pause
434f248 / 727c7aa deprecate url_get_filename().
434f248 / 5958df3 deprecate url_max_packet_size().
434f248 / 1869ea0 deprecate url_get_file_handle().
434f248 / 32a97d4 deprecate url_filesize().
434f248 / e52a914 deprecate url_close().
434f248 / 58a48c6 deprecate url_seek().
434f248 / 925e908 deprecate url_write().
434f248 / dce3756 deprecate url_read_complete().
434f248 / bc371ac deprecate url_read().
434f248 / 0589da0 deprecate url_open().
434f248 / 62eaaea deprecate url_connect.
434f248 / 5652bb9 deprecate url_alloc.
434f248 / 333e894 deprecate url_open_protocol
434f248 / e230705 deprecate url_poll and URLPollEntry
2011-04-08 - lavf 52.106.0 - avformat.h
Minor avformat.h cleanup:
d4d0932 / a9bf9d8 deprecate av_guess_image2_codec
d4d0932 / c3675df rename avf_sdp_create->av_sdp_create
2011-04-03 - lavf 52.105.0 - avio.h
Large-scale renaming/deprecating of AVIOContext-related functions:
2cae980 / 724f6a0 deprecate url_fdopen
2cae980 / 403ee83 deprecate url_open_dyn_packet_buf
2cae980 / 6dc7d80 rename url_close_dyn_buf -> avio_close_dyn_buf
2cae980 / b92c545 rename url_open_dyn_buf -> avio_open_dyn_buf
1caa412 / b64030f deprecate get_checksum()
1caa412 / 4c4427a deprecate init_checksum()
2fd41c9 / 4ec153b deprecate udp_set_remote_url/get_local_port
4fa0e24 / 933e90a deprecate av_url_read_fseek/fpause
4fa0e24 / 8d9769a deprecate url_fileno
0fecf26 / b7f2fdd rename put_flush_packet -> avio_flush
0fecf26 / 35f1023 deprecate url_close_buf
0fecf26 / 83fddae deprecate url_open_buf
0fecf26 / d9d86e0 rename url_fprintf -> avio_printf
0fecf26 / 59f65d9 deprecate url_setbufsize
6947b0c / 3e68b3b deprecate url_ferror
e8bb2e2 deprecate url_fget_max_packet_size
76aa876 rename url_fsize -> avio_size
e519753 deprecate url_fgetc
655e45e deprecate url_fgets
a2704c9 rename url_ftell -> avio_tell
e16ead0 deprecate get_strz() in favor of avio_get_str
0300db8,2af07d3 rename url_fskip -> avio_skip
6b4aa5d rename url_fseek -> avio_seek
61840b4 deprecate put_tag
22a3212 rename url_fopen/fclose -> avio_open/close.
0ac8e2b deprecate put_nbyte
77eb550 rename put_byte -> avio_w8
put_[b/l]e<type> -> avio_w[b/l]<type>
put_buffer -> avio_write
b7effd4 rename get_byte -> avio_r8,
get_[b/l]e<type> -> avio_r[b/l]<type>
get_buffer -> avio_read
b3db9ce deprecate get_partial_buffer
8d9ac96 rename av_alloc_put_byte -> avio_alloc_context
2011-03-02 - 863c471 - lavf 52.103.0 - av_pkt_dump2, av_pkt_dump_log2
Deprecate av_pkt_dump and av_pkt_dump_log.
2011-02-09 - c0b102c - lavc 52.112.0 - avcodec_thread_init()
Deprecate avcodec_thread_init()/avcodec_thread_free() use; instead set thread_count before calling avcodec_open.
2011-02-02 - lavf 52.95.0
Deprecate corresponding semi-public {put,get}_str*.
2011-01-07 - 81c623f - lavc 52.107.0 - deprecate reordered_opaque
Deprecate reordered_opaque in favor of pkt_pts/dts.
2010-12-04 - bb4afa1 - lavu 50.34.0 - av_get_pix_fmt_string()
Deprecate avcodec_pix_fmt_string() in favor of pixdesc.h/av_get_pix_fmt_string().
2010-11-21 - 176a615 - lavcore 0.14.0 - audioconvert.h
deprecate the corresponding functions in libavcodec:
avcodec_get_channel_name()
avcodec_get_channel_layout()
avcodec_get_channel_layout_string()
avcodec_channel_layout_num_channels()
and the CH_* macros defined in libavcodec/avcodec.h.
2010-11-08 - d2af720 - lavu 50.33.0 - eval.h
Deprecate functions:
av_parse_and_eval_expr(),
av_parse_expr(),
av_eval_expr(),
av_free_expr(),
in favor of the functions:
av_expr_parse_and_eval(),
av_expr_parse(),
av_expr_eval(),
av_expr_free().
2010-11-02 - 6f84cd1 - lavcore 0.12.0 - av_get_bits_per_sample_fmt()
deprecate av_get_bits_per_sample_format().
2010-11-02 - d63e456 - lavcore 0.11.0 - samplefmt.h
deprecate the corresponding libavcodec/audioconvert.h functions:
avcodec_get_sample_fmt_name(),
avcodec_get_sample_fmt(),
avcodec_sample_fmt_string().
2010-11-02 - 262d1c5 - lavcore 0.10.0 - samplefmt.h
deprecate enum SampleFormat.
2010-10-15 - 03700d3 - lavf 52.83.0 - metadata API
Deprecate the public conversion API.
2010-09-24 - f66eb58 - lavc 52.90.0 - av_opt_show2()
Deprecate av_opt_show() in favor or av_opt_show2().
2010-09-04 - 7160bb7 - lavu 50.25.0 - AV_CPU_FLAG_*
Deprecate the FF_MM_* flags defined in libavcodec/avcodec.h in favor of the AV_CPU_FLAG_* flags defined in libavutil/cpu.h.
2010-08-06 - bf176f5 - lavcore 0.3.0 - av_check_image_size()
Deprecate avcodec_check_dimensions() in favor of the function av_check_image_size() defined in libavcore/imgutils.h.
2010-07-27 - 126b638 - lavcore 0.1.0 - parseutils.h
Deprecate av_parse_video_frame_size() and av_parse_video_frame_rate()
defined in libavcodec in favor of the newly added functions
av_parse_video_size() and av_parse_video_rate() declared in
libavcore/parseutils.h.
2010-07-11 - 23940f1 - lavc 52.83.0
Add AVCodecContext.lpc_type and AVCodecContext.lpc_passes fields.
Add AVLPCType enum.
Deprecate AVCodecContext.use_lpc.
2009-04-11 - 80d403f - lavc 52.25.0 -
deprecate av_destruct_packet_nofree() use NULL instead.