intff_h264_decode_extradata(constuint8_t *data,intsize, H264ParamSets *ps,int*is_avc,int*nal_length_size,interr_recognition,void*logctx) {intret;if(!data || size <=0)return-1;if(data[0] ==1) {inti, cnt, nalsize;constuint8_t *p =data;*is_avc =1;if(size <7) { av_log...
is_avc=true nal_length_size=4 id=0x1 r_frame_rate=30/1 avg_frame_rate=30/1 time_base=1/15360 start_pts=0 start_time=0.000000 duration_ts=388608 duration=25.300000 bit_rate=964695 max_bit_rate=N/A bits_per_raw_sample=8 nb_frames=759 nb_read_frames=N/A nb_read_packets=N/A ext...
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constchar*name:格式的名称constchar*mime_type: mime类型如 video/avc video/hevc audio/aac等 以及一系列函数指针int(*read_probe)(constAVProbeData*);int(*read_packet)(structAVFormatContext*,AVPacket*pkt);int(*read_close)(structAVFormatContext*);int(*read_seek)(structAVFormatContext*,intstream_index...
MP4文件使用H.264(或AVC)和H.265(或HEVC)等高效的视频编码技术,能够在较小的文件大小下提供高质量的视频,这对于保持点播内容的视觉效果同时减少存储和带宽成本是非常有利的。 支持多种数据流: MP4格式可以容纳多个数据流,如视频、音频和字幕轨道。该特性对于提供多语言选项和其他增强服务是很重要的。
Stream is a fancy name for a continuous flow of data.Suppose our video has two streams: an audio encoded with AAC CODEC and a video encoded with H264 (AVC) CODEC. From each stream we can extract pieces (slices) of data called packets that will be loaded into components named AVPacket....
int slice_count;//片的总和,关于slice相关,可以[音视频开发之旅(56) -H264/AVC基本结构](https://mp.weixin.qq.com/s?__biz=MzU5NjkxMjE5Mg==&mid=2247484355&idx=1&sn=538378561c16b640a4ea42bc1f354044&chksm=fe5a32ecc92dbbfa1d6a2e83f22aece727badb99966b6e621322ed8bf6b0cd8f0b2d1c262013&...
Encoder libx264 [libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10]: General capabilities: dr1 delay threads Threading capabilities: other Supported pixel formats: yuv420p yuvj420p yuv422p yuvj422p yuv444p yuvj444p nv12 nv16 nv21 yuv420p10le yuv422p10le yuv444p10le nv20le ...
"IsInterlaced":false,"IsAVC":null,"ChannelLayout":"stereo","BitRate":960000,"BitDepth":16,"RefFrames":null,"PacketLength":null,"Channels":2,"SampleRate":48000,"IsDefault":false,"IsForced":false,"Height":null,"Width":null,"AverageFrameRate":null,"RealFrameRate":null,"Profile":null,"...
重复一遍标题:264/265等如何提高压缩比,比如保持前景清晰度,牺牲背景清晰度 其实我这个问题问得不好,问题本身涉及基础理论知识 正文:我下载过一个视频,是264编码 AVC Main@3.2 ,480p分辨率,视频平均码率1500kb/s(相对x265而言,该码率不算低)但该480p的全屏播放的效果堪比1080p。画面保持了前景清晰度(我感觉其实是...