高校网站建设的优势和不足,怎么做电商赚钱,网站服务内容怎么写,wordpress 本地 域名绑定1 ffmpeg命令行
一般对视频文件的裁剪 我们通过一行 ffmpeg命令行即可实现#xff0c;比如 ffmpeg -ss 0.5 - t 3 - i a.mp4 vcodec copy b.mp4 其中 -ss 放置较前 开启精准seek定位 对于mp4而言 seek将从moov中相关索引表查找 0.5s时刻附近最近的关键帧 #xff08;此描述…1 ffmpeg命令行
一般对视频文件的裁剪 我们通过一行 ffmpeg命令行即可实现比如 ffmpeg -ss 0.5 - t 3 - i a.mp4 vcodec copy b.mp4 其中 -ss 放置较前 开启精准seek定位 对于mp4而言 seek将从moov中相关索引表查找 0.5s时刻附近最近的关键帧 此描述可能不精确
ffmpeg根据此命令是如何裁剪呢
1.1 命令行入口
执行代码位置
fftools/ffmpeg.c
int main(int argc, char **argv)
{int i, ret;BenchmarkTimeStamps ti;init_dynload();register_exit(ffmpeg_cleanup);setvbuf(stderr,NULL,_IONBF,0); /* win32 runtime needs this */av_log_set_flags(AV_LOG_SKIP_REPEATED);parse_loglevel(argc, argv, options);if(argc1 !strcmp(argv[1], -d)){run_as_daemon1;av_log_set_callback(log_callback_null);argc--;argv;}#if CONFIG_AVDEVICEavdevice_register_all();
#endifavformat_network_init();show_banner(argc, argv, options);/* parse options and open all input/output files */ret ffmpeg_parse_options(argc, argv);if (ret 0)exit_program(1);if (nb_output_files 0 nb_input_files 0) {show_usage();av_log(NULL, AV_LOG_WARNING, Use -h to get full help or, even better, run man %s\n, program_name);exit_program(1);}/* file converter / grab */if (nb_output_files 0) {av_log(NULL, AV_LOG_FATAL, At least one output file must be specified\n);exit_program(1);}for (i 0; i nb_output_files; i) {if (strcmp(output_files[i]-ctx-oformat-name, rtp))want_sdp 0;}current_time ti get_benchmark_time_stamps();if (transcode() 0)exit_program(1);if (do_benchmark) {int64_t utime, stime, rtime;current_time get_benchmark_time_stamps();utime current_time.user_usec - ti.user_usec;stime current_time.sys_usec - ti.sys_usec;rtime current_time.real_usec - ti.real_usec;av_log(NULL, AV_LOG_INFO,bench: utime%0.3fs stime%0.3fs rtime%0.3fs\n,utime / 1000000.0, stime / 1000000.0, rtime / 1000000.0);}av_log(NULL, AV_LOG_DEBUG, %PRIu64 frames successfully decoded, %PRIu64 decoding errors\n,decode_error_stat[0], decode_error_stat[1]);if ((decode_error_stat[0] decode_error_stat[1]) * max_error_rate decode_error_stat[1])exit_program(69);exit_program(received_nb_signals ? 255 : main_return_code);return main_return_code;
}
1.2 执行流程
代码流程比较清晰 主要流程如下 1.3 输入上下文设置
ffmpeg将解析的参数存放到OptionParseContext中包含输入及输出参数设置然后进入输入上下文
根据之前解析的数据OptionPareseContext作为参数传入确定好seek点然后调用 avformat_seek_file
static int open_input_file(OptionsContext *o, const char *filename)
{InputFile *f;AVFormatContext *ic;AVInputFormat *file_iformat NULL;int err, i, ret;int64_t timestamp;AVDictionary *unused_opts NULL;AVDictionaryEntry *e NULL;char * video_codec_name NULL;char * audio_codec_name NULL;char *subtitle_codec_name NULL;char * data_codec_name NULL;int scan_all_pmts_set 0;if (o-stop_time ! INT64_MAX o-recording_time ! INT64_MAX) {o-stop_time INT64_MAX;av_log(NULL, AV_LOG_WARNING, -t and -to cannot be used together; using -t.\n);}if (o-stop_time ! INT64_MAX o-recording_time INT64_MAX) {int64_t start_time o-start_time AV_NOPTS_VALUE ? 0 : o-start_time;if (o-stop_time start_time) {av_log(NULL, AV_LOG_ERROR, -to value smaller than -ss; aborting.\n);exit_program(1);} else {o-recording_time o-stop_time - start_time;}}if (o-format) {if (!(file_iformat av_find_input_format(o-format))) {av_log(NULL, AV_LOG_FATAL, Unknown input format: %s\n, o-format);exit_program(1);}}if (!strcmp(filename, -))filename pipe:;stdin_interaction strncmp(filename, pipe:, 5) strcmp(filename, /dev/stdin);/* get default parameters from command line */ic avformat_alloc_context();if (!ic) {print_error(filename, AVERROR(ENOMEM));exit_program(1);}if (o-nb_audio_sample_rate) {av_dict_set_int(o-g-format_opts, sample_rate, o-audio_sample_rate[o-nb_audio_sample_rate - 1].u.i, 0);}if (o-nb_audio_channels) {/* because we set audio_channels based on both the ac and* channel_layout options, we need to check that the specified* demuxer actually has the channels option before setting it */if (file_iformat file_iformat-priv_class av_opt_find(file_iformat-priv_class, channels, NULL, 0,AV_OPT_SEARCH_FAKE_OBJ)) {av_dict_set_int(o-g-format_opts, channels, o-audio_channels[o-nb_audio_channels - 1].u.i, 0);}}if (o-nb_frame_rates) {/* set the format-level framerate option;* this is important for video grabbers, e.g. x11 */if (file_iformat file_iformat-priv_class av_opt_find(file_iformat-priv_class, framerate, NULL, 0,AV_OPT_SEARCH_FAKE_OBJ)) {av_dict_set(o-g-format_opts, framerate,o-frame_rates[o-nb_frame_rates - 1].u.str, 0);}}if (o-nb_frame_sizes) {av_dict_set(o-g-format_opts, video_size, o-frame_sizes[o-nb_frame_sizes - 1].u.str, 0);}if (o-nb_frame_pix_fmts)av_dict_set(o-g-format_opts, pixel_format, o-frame_pix_fmts[o-nb_frame_pix_fmts - 1].u.str, 0);MATCH_PER_TYPE_OPT(codec_names, str, video_codec_name, ic, v);MATCH_PER_TYPE_OPT(codec_names, str, audio_codec_name, ic, a);MATCH_PER_TYPE_OPT(codec_names, str, subtitle_codec_name, ic, s);MATCH_PER_TYPE_OPT(codec_names, str, data_codec_name, ic, d);if (video_codec_name)ic-video_codec find_codec_or_die(video_codec_name , AVMEDIA_TYPE_VIDEO , 0);if (audio_codec_name)ic-audio_codec find_codec_or_die(audio_codec_name , AVMEDIA_TYPE_AUDIO , 0);if (subtitle_codec_name)ic-subtitle_codec find_codec_or_die(subtitle_codec_name, AVMEDIA_TYPE_SUBTITLE, 0);if (data_codec_name)ic-data_codec find_codec_or_die(data_codec_name , AVMEDIA_TYPE_DATA , 0);ic-video_codec_id video_codec_name ? ic-video_codec-id : AV_CODEC_ID_NONE;ic-audio_codec_id audio_codec_name ? ic-audio_codec-id : AV_CODEC_ID_NONE;ic-subtitle_codec_id subtitle_codec_name ? ic-subtitle_codec-id : AV_CODEC_ID_NONE;ic-data_codec_id data_codec_name ? ic-data_codec-id : AV_CODEC_ID_NONE;ic-flags | AVFMT_FLAG_NONBLOCK;if (o-bitexact)ic-flags | AVFMT_FLAG_BITEXACT;ic-interrupt_callback int_cb;if (!av_dict_get(o-g-format_opts, scan_all_pmts, NULL, AV_DICT_MATCH_CASE)) {av_dict_set(o-g-format_opts, scan_all_pmts, 1, AV_DICT_DONT_OVERWRITE);scan_all_pmts_set 1;}/* open the input file with generic avformat function */err avformat_open_input(ic, filename, file_iformat, o-g-format_opts);if (err 0) {print_error(filename, err);if (err AVERROR_PROTOCOL_NOT_FOUND)av_log(NULL, AV_LOG_ERROR, Did you mean file:%s?\n, filename);exit_program(1);}if (scan_all_pmts_set)av_dict_set(o-g-format_opts, scan_all_pmts, NULL, AV_DICT_MATCH_CASE);remove_avoptions(o-g-format_opts, o-g-codec_opts);assert_avoptions(o-g-format_opts);/* apply forced codec ids */for (i 0; i ic-nb_streams; i)choose_decoder(o, ic, ic-streams[i]);if (find_stream_info) {AVDictionary **opts setup_find_stream_info_opts(ic, o-g-codec_opts);int orig_nb_streams ic-nb_streams;/* If not enough info to get the stream parameters, we decode thefirst frames to get it. (used in mpeg case for example) */ret avformat_find_stream_info(ic, opts);for (i 0; i orig_nb_streams; i)av_dict_free(opts[i]);av_freep(opts);if (ret 0) {av_log(NULL, AV_LOG_FATAL, %s: could not find codec parameters\n, filename);if (ic-nb_streams 0) {avformat_close_input(ic);exit_program(1);}}}if (o-start_time ! AV_NOPTS_VALUE o-start_time_eof ! AV_NOPTS_VALUE) {av_log(NULL, AV_LOG_WARNING, Cannot use -ss and -sseof both, using -ss for %s\n, filename);o-start_time_eof AV_NOPTS_VALUE;}if (o-start_time_eof ! AV_NOPTS_VALUE) {if (o-start_time_eof 0) {av_log(NULL, AV_LOG_ERROR, -sseof value must be negative; aborting\n);exit_program(1);}if (ic-duration 0) {o-start_time o-start_time_eof ic-duration;if (o-start_time 0) {av_log(NULL, AV_LOG_WARNING, -sseof value seeks to before start of file %s; ignored\n, filename);o-start_time AV_NOPTS_VALUE;}} elseav_log(NULL, AV_LOG_WARNING, Cannot use -sseof, duration of %s not known\n, filename);}timestamp (o-start_time AV_NOPTS_VALUE) ? 0 : o-start_time;/* add the stream start time */if (!o-seek_timestamp ic-start_time ! AV_NOPTS_VALUE)timestamp ic-start_time;/* if seeking requested, we execute it */if (o-start_time ! AV_NOPTS_VALUE) {int64_t seek_timestamp timestamp;if (!(ic-iformat-flags AVFMT_SEEK_TO_PTS)) {int dts_heuristic 0;for (i0; iic-nb_streams; i) {const AVCodecParameters *par ic-streams[i]-codecpar;if (par-video_delay) {dts_heuristic 1;break;}}if (dts_heuristic) {seek_timestamp - 3*AV_TIME_BASE / 23;}}ret avformat_seek_file(ic, -1, INT64_MIN, seek_timestamp, seek_timestamp, 0);if (ret 0) {av_log(NULL, AV_LOG_WARNING, %s: could not seek to position %0.3f\n,filename, (double)timestamp / AV_TIME_BASE);}}/* update the current parameters so that they match the one of the input stream */add_input_streams(o, ic);/* dump the file content */av_dump_format(ic, nb_input_files, filename, 0);GROW_ARRAY(input_files, nb_input_files);f av_mallocz(sizeof(*f));if (!f)exit_program(1);input_files[nb_input_files - 1] f;f-ctx ic;f-ist_index nb_input_streams - ic-nb_streams;f-start_time o-start_time;f-recording_time o-recording_time;f-input_ts_offset o-input_ts_offset;f-ts_offset o-input_ts_offset - (copy_ts ? (start_at_zero ic-start_time ! AV_NOPTS_VALUE ? ic-start_time : 0) : timestamp);f-nb_streams ic-nb_streams;f-rate_emu o-rate_emu;f-accurate_seek o-accurate_seek;f-loop o-loop;f-duration 0;f-time_base (AVRational){ 1, 1 };
#if HAVE_THREADSf-thread_queue_size o-thread_queue_size 0 ? o-thread_queue_size : 8;
#endif/* check if all codec options have been used */unused_opts strip_specifiers(o-g-codec_opts);for (i f-ist_index; i nb_input_streams; i) {e NULL;while ((e av_dict_get(input_streams[i]-decoder_opts, , e,AV_DICT_IGNORE_SUFFIX)))av_dict_set(unused_opts, e-key, NULL, 0);}e NULL;while ((e av_dict_get(unused_opts, , e, AV_DICT_IGNORE_SUFFIX))) {const AVClass *class avcodec_get_class();const AVOption *option av_opt_find(class, e-key, NULL, 0,AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ);const AVClass *fclass avformat_get_class();const AVOption *foption av_opt_find(fclass, e-key, NULL, 0,AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ);if (!option || foption)continue;if (!(option-flags AV_OPT_FLAG_DECODING_PARAM)) {av_log(NULL, AV_LOG_ERROR, Codec AVOption %s (%s) specified for input file #%d (%s) is not a decoding option.\n, e-key,option-help ? option-help : , nb_input_files - 1,filename);exit_program(1);}av_log(NULL, AV_LOG_WARNING, Codec AVOption %s (%s) specified for input file #%d (%s) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some decoder which was not actually used for any stream.\n, e-key,option-help ? option-help : , nb_input_files - 1, filename);}av_dict_free(unused_opts);for (i 0; i o-nb_dump_attachment; i) {int j;for (j 0; j ic-nb_streams; j) {AVStream *st ic-streams[j];if (check_stream_specifier(ic, st, o-dump_attachment[i].specifier) 1)dump_attachment(st, o-dump_attachment[i].u.str);}}input_stream_potentially_available 1;return 0;
}1.4 avformat_seek_file
int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts,int64_t ts, int64_t max_ts, int flags)
{if (min_ts ts || max_ts ts)return -1;if (stream_index -1 || stream_index (int)s-nb_streams)return AVERROR(EINVAL);if (s-seek2any0)flags | AVSEEK_FLAG_ANY;flags ~AVSEEK_FLAG_BACKWARD;if (s-iformat-read_seek2) {int ret;ff_read_frame_flush(s);if (stream_index -1 s-nb_streams 1) {AVRational time_base s-streams[0]-time_base;ts av_rescale_q(ts, AV_TIME_BASE_Q, time_base);min_ts av_rescale_rnd(min_ts, time_base.den,time_base.num * (int64_t)AV_TIME_BASE,AV_ROUND_UP | AV_ROUND_PASS_MINMAX);max_ts av_rescale_rnd(max_ts, time_base.den,time_base.num * (int64_t)AV_TIME_BASE,AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);stream_index 0;}ret s-iformat-read_seek2(s, stream_index, min_ts,ts, max_ts, flags);if (ret 0)ret avformat_queue_attached_pictures(s);return ret;}if (s-iformat-read_timestamp) {// try to seek via read_timestamp()}// Fall back on old API if new is not implemented but old is.// Note the old API has somewhat different semantics.if (s-iformat-read_seek || 1) {int dir (ts - (uint64_t)min_ts (uint64_t)max_ts - ts ? AVSEEK_FLAG_BACKWARD : 0);int ret av_seek_frame(s, stream_index, ts, flags | dir);if (ret0 ts ! min_ts max_ts ! ts) {ret av_seek_frame(s, stream_index, dir ? max_ts : min_ts, flags | dir);if (ret 0)ret av_seek_frame(s, stream_index, ts, flags | (dir^AVSEEK_FLAG_BACKWARD));}return ret;}// try some generic seek like seek_frame_generic() but with new ts semanticsreturn -1; //unreachable
}
ffmpeg中大部分fromat都定义实现了read_seek ,一般情况下都会调用av_seek_frame因为输入文件是mp4格式 .format对应 mov ,
av_ssek_frame-seek_frame_internal- read_seek -mov_read_seek
AVInputFormat ff_mov_demuxer {.name mov,mp4,m4a,3gp,3g2,mj2,.long_name NULL_IF_CONFIG_SMALL(QuickTime / MOV),.priv_class mov_class,.priv_data_size sizeof(MOVContext),.extensions mov,mp4,m4a,3gp,3g2,mj2,.read_probe mov_probe,.read_header mov_read_header,.read_packet mov_read_packet,.read_close mov_read_close,.read_seek mov_read_seek,.flags AVFMT_NO_BYTE_SEEK | AVFMT_SEEK_TO_PTS,
};真正确定seek位置代码函数 ff_index_search_timestamp flags不同 查询规则有所不同
int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,int64_t wanted_timestamp, int flags)
{int a, b, m;int64_t timestamp;a -1;b nb_entries;// Optimize appending index entries at the end.if (b entries[b - 1].timestamp wanted_timestamp)a b - 1;while (b - a 1) {m (a b) 1;// Search for the next non-discarded packet.while ((entries[m].flags AVINDEX_DISCARD_FRAME) m b m nb_entries - 1) {m;if (m b entries[m].timestamp wanted_timestamp) {m b - 1;break;}}timestamp entries[m].timestamp;if (timestamp wanted_timestamp)b m;if (timestamp wanted_timestamp)a m;}m (flags AVSEEK_FLAG_BACKWARD) ? a : b;if (!(flags AVSEEK_FLAG_ANY))while (m 0 m nb_entries !(entries[m].flags AVINDEX_KEYFRAME))m (flags AVSEEK_FLAG_BACKWARD) ? -1 : 1;if (m nb_entries)return -1;return m;
} flags:
#define AVSEEK_FLAG_BACKGROUND 1 ///Seek Background 往后移
#define AVSEEK_FALG_BYTE ///seeking based on position in bytes 让时间戳 变成一个 byte, 按照文件的大小位置跳到那个位置
#define AVSEEK_FLAG_ANY ///seek to any frame, even non-keyframes // 移动到任意帧的位置不去找前面的关键帧
#define AVSEEK_FLAG_FRAME ///seeking based on frame number // 找关键帧一般与 AVSEEK_FLAG_BACKGROUND 一起使用 2 TS
对于ts切割格式采用同样的方式分析 mpegts.c , 并未定义 read_seek
AVInputFormat ff_mpegts_demuxer {.name mpegts,.long_name NULL_IF_CONFIG_SMALL(MPEG-TS (MPEG-2 Transport Stream)),.priv_data_size sizeof(MpegTSContext),.read_probe mpegts_probe,.read_header mpegts_read_header,.read_packet mpegts_read_packet,.read_close mpegts_read_close,.read_timestamp mpegts_get_dts,.flags AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,.priv_class mpegts_class,
};
从而进入 ff_seek_frame_binary 方法由于是实时流没有index_entry 调用ff_gen_search 生成seek pos gen_seek
int ff_seek_frame_binary(AVFormatContext *s, int stream_index,int64_t target_ts, int flags)
{const AVInputFormat *avif s-iformat;int64_t av_uninit(pos_min), av_uninit(pos_max), pos, pos_limit;int64_t ts_min, ts_max, ts;int index;int64_t ret;AVStream *st;if (stream_index 0)return -1;av_log(s, AV_LOG_TRACE, read_seek: %d %s\n, stream_index, av_ts2str(target_ts));ts_max ts_min AV_NOPTS_VALUE;pos_limit -1; // GCC falsely says it may be uninitialized.st s-streams[stream_index];if (st-index_entries) {AVIndexEntry *e;/* FIXME: Whole function must be checked for non-keyframe entries in* index case, especially read_timestamp(). */index av_index_search_timestamp(st, target_ts,flags | AVSEEK_FLAG_BACKWARD);index FFMAX(index, 0);e st-index_entries[index];if (e-timestamp target_ts || e-pos e-min_distance) {pos_min e-pos;ts_min e-timestamp;av_log(s, AV_LOG_TRACE, using cached pos_min0x%PRIx64 dts_min%s\n,pos_min, av_ts2str(ts_min));} else {av_assert1(index 0);}index av_index_search_timestamp(st, target_ts,flags ~AVSEEK_FLAG_BACKWARD);av_assert0(index st-nb_index_entries);if (index 0) {e st-index_entries[index];av_assert1(e-timestamp target_ts);pos_max e-pos;ts_max e-timestamp;pos_limit pos_max - e-min_distance;av_log(s, AV_LOG_TRACE, using cached pos_max0x%PRIx64 pos_limit0x%PRIx64 dts_max%s\n, pos_max, pos_limit, av_ts2str(ts_max));}}pos ff_gen_search(s, stream_index, target_ts, pos_min, pos_max, pos_limit,ts_min, ts_max, flags, ts, avif-read_timestamp);if (pos 0)return -1;/* do the seek */if ((ret avio_seek(s-pb, pos, SEEK_SET)) 0)return ret;ff_read_frame_flush(s);ff_update_cur_dts(s, st, ts);return 0;
}
注意avid-read_timestamap mpegts 将通过mpegts_get_dts 通过时间戳查询pos
AVInputFormat ff_mpegts_demuxer {.name mpegts,.long_name NULL_IF_CONFIG_SMALL(MPEG-TS (MPEG-2 Transport Stream)),.priv_data_size sizeof(MpegTSContext),.read_probe mpegts_probe,.read_header mpegts_read_header,.read_packet mpegts_read_packet,.read_close mpegts_read_close,.read_timestamp mpegts_get_dts,.flags AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,.priv_class mpegts_class,
};
static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,int64_t *ppos, int64_t pos_limit)
{MpegTSContext *ts s-priv_data;int64_t pos;int pos47 ts-pos47_full % ts-raw_packet_size;pos ((*ppos ts-raw_packet_size - 1 - pos47) / ts-raw_packet_size) * ts-raw_packet_size pos47;ff_read_frame_flush(s);if (avio_seek(s-pb, pos, SEEK_SET) 0)return AV_NOPTS_VALUE;while(pos pos_limit) {int ret;AVPacket pkt;av_init_packet(pkt);ret av_read_frame(s, pkt);if (ret 0)return AV_NOPTS_VALUE;if (pkt.dts ! AV_NOPTS_VALUE pkt.pos 0) {ff_reduce_index(s, pkt.stream_index);av_add_index_entry(s-streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);if (pkt.stream_index stream_index pkt.pos *ppos) {int64_t dts pkt.dts;*ppos pkt.pos;av_packet_unref(pkt);return dts;}}pos pkt.pos;av_packet_unref(pkt);}return AV_NOPTS_VALUE;
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