Error while filtering: Generic error in an external library [out#0/mp4 @ 0xb400007342d09780] Nothing was written into output file, because at least one of its streams received no packets. No problem if you specify the video codec for example "-c:v libx264" ...
ffmpeg首先读取输入源,然后通过Demuxer将音视频包进行解封装,这个动作通过调用libavformat中的接口即可实现; 接下来通过Decoder进行解码,将音视频通过Decoder解包称为YUV或者PCM这样的数据,Decoder通过libavcodec中的接口即可实现; 然后通过Encoder将对应的数据进行编码,编码可以通过libavcodec中的接口来实现; 接下来将编码后的...
.E...=Encoding supported // 支持编码..V...=Video codec // 视频编码..A...=Audio codec // 音频编码..S...=Subtitle codec // 字幕编解码器(没用过不清楚)...I..=Intra frame-only codec// 仅帧内编解码器(没用过不清楚)...L.=Lossy compression // 有损压缩...S=Lossless compression ...
WhenCook Typeis set to theService, this parameter is used to specify the name of the service. For more information on using services, see thePDG Service Managerdocumentation. Tool Presets Sets of pre-defined FFmpeg operations (presets) that automatically configure the node’s parameters and the ...
-target type specify target file type ("vcd", "svcd", "dvd", "dv" or "dv50"with optional prefixes "pal-", "ntsc-" or "film-")设置目标文件格式 -apad audio pad -frames number set the number of frames to output 设置帧数 -filter filter_graph set stream filtergraph 设置流...
Now, we can use any of those to perform our transcoding. Use the-coption to specify a codec, with a:aor:vfor audio and video codecs respectively. These are called “streams” in FFmpeg – normally there is one video and one audio stream, but you could of course use more. Let’s ...
如果是单纯使用libavcodec,这部分信息需要调用者进行初始化;如果是使用整个FFMPEG库,这部分信息在调用 avformat_open_input和avformat_find_stream_info的过程中根据文件的头信息及媒体流内的头部信息完成初始 化。其中几个主要域的释义如下: extradata/extradata_size:这个buffer中存放了解码器可能会用到的额外信息,在...
* If a source file does not specify a duration, but does specify * a bitrate, this value will be estimated from bitrate and file size. */ int64_t duration; #if LIBAVFORMAT_VERSION_INT < (53<<16) char language[4]; /** ISO 639-2/B 3-letter language code (empty string if ...
-target type specify target file type ("vcd", "svcd", "dvd", "dv" or "dv50" with optional prefixes "pal-", "ntsc-" or "film-") 指定目标文件的类型 -apad audio pad 音频补齐 -frames number set the number of frames to output 设置输出多少帧 ...
codec_whitelist:设置可以解析的 codec 的白名单; format_whitelist:设置可以解析的 format 的白名单; 2、ffmpeg 的编转码 FFmpeg 的编解码部分主要是通过 libavcodec 这个库来完成的功能,通过 libavcodec 库进行 encode 与 decode 操作,多媒体的编码格式种类很多,但是还是有好多基本的操作参数是共同可以设置的,下面来...