voidav_channel_layout_default(AVChannelLayout*ch_layout,intnb_channels); ch_layout:待初始化的通道布局; nb_channels:通道数量; 25 av_channel_layout_describe 作用:获取描述通道布局属性的字符串,该字符串与av_channel_layout_from_string的参数格式相同,可以用来重建相同的通道布局。 函数原型: intav_channel...
av_channel_layout_describe_bprint(&outlink->ch_layout,&bp); av_log(ctx,AV_LOG_VERBOSE,"%s\n",bp.str); return0; Expand Down 4 changes: 1 addition & 3 deletions4libavfilter/graphdump.c Original file line numberDiff line numberDiff line change ...
dst_ch_layout.nb_channels(2); dst_ch_layout.order(AV_CHANNEL_ORDER_NATIVE); dst_ch_layout.u_mask(AV_CH_LAYOUT_STEREO); intdst_rate=44100, dst_nb_channels =0, dst_sample_fmt = AV_SAMPLE_FMT_S16; longdst_nb_samples=0, max_dst_nb_samples =0; ...
[512]; int ret = av_channel_layout_describe(&enc->ch_layout, buf, sizeof(buf)); if (ret >= 0) av_bprintf(&bprint, "%s", buf); } if (enc->sample_fmt != AV_SAMPLE_FMT_NONE && (str = av_get_sample_fmt_name(enc->sample_fmt))) { av_bprintf(&bprint, ", %s", str...
FFmpeg来源简单分析:结构会员管理系统-AVClass,打算写两篇文章记录FFmpeg中和AVOption有关的源码。AVOption用于在FFmpeg中描写叙述结构体中的成员变量。它最基本的作用能够概括为两个字:“赋值”。一个AVOption结构体包括了变量名称,简短的帮助,取值等等信息。全部和AV
FFmpeg源码简单分析:av_register_all() FFmpeg源码简单分析:avcodec_register_all() FFmpeg源码简单分析:内存的分配和释放(av_malloc()、av_free()等) FFmpeg源码简单分析:常见结构体的初始化和销毁(AVFormatContext。AVFrame等) FFmpeg源码简单分析:avio_open2() ...
(ret = av_channel_layout_check(&s->in_ch_layout)) || s->in_ch_layout.nb_channels > SWR_CH_MAX) { if (ret) av_channel_layout_describe(&s->in_ch_layout, l1, sizeof(l1)); av_log(s, AV_LOG_WARNING, "Input channel layout \"%s\" is invalid or unsupported.\n", ret ? l1...
av_log_set_level(AV_LOG_INFO); //打开视频的上下文 //@1音视频上下文 //@2文件路径 //@3文件格式(不指定根据文件名判断) //@4获取配置项的字典 ret=avformat_open_input(&fmt_ctx,"./test.mp4",fmt,NULL); if(ret<0) { av_log(NULL,AV_LOG_ERROR,"Can't open file:%s\n",av_err2str(...
bits_per_raw_sample integer channel_layout integer (decoding/encoding,audio) Possible values: request_channel_layout integer (decoding,audio) Possible values: rc_max_vbv_use float (encoding,video) rc_min_vbv_use float (encoding,video) ticks_per_frame integer (decoding/encoding,audio,video) color...
ffmpeg -i INPUT -map_channel -1 -map_channel 0.0.1 OUTPUT The order of the "-map_channel" option specifies the order of the channels in the output stream. The output channel layout is guessed from the number of channels mapped (mono if one "-map_channel", stereo if two, etc.). ...