mp4box

现在很多flv和mkv视频都是采用的h264封装，移动设备往往并不支持这些格式的文件，但却对h264封装的mp4支持良好。因此，为了视频能在电脑和移动设备间共享，我通常会将其转换成h264封装的mp4文件。 由于视频转码非常耗时间和cpu，如果flv和mkv本来就是采用的h264封装，完全不需要转码，只需要把h264视频和音频文件分离出来，重新混流一次即可，十几秒内即可完成，非常快速，并且由于没有转码操作，也避免了转码过程的画面损失。 下面我就介绍几种将h264格式的flv和mkv无损转换为mp4的方法。 一、通过ffmpeg转换mkv文件 ffmpge（ 点击下载 ）可以非常快速的实现h264视频的分离和混流，并且是命令行的操作，也没有什么参数需要设置，非常适合批量转换： ffmpeg.exe -i input.mkv -y -vcodec copy -acodec copy output.mp4 要实现批量转换，可以直接用这个批处理文件： for %%i in ( *.mkv ) do ffmpeg.exe -i "%%i" -vcodec copy -acodec copy " %%~ni.mp4 " 二、通过FlvExtract + mp4box转换mkv文件 这个方法本身也支持转换flv文件，但是ffmpeg貌似对flv的支持不够好，很容易转换失败。对于flv文件

I am working one video transcoding in FFmpeg and MP4Box. Currently I am trying to combine/merge/concatenate specific MPEG-DASH video segments(m4s ex:int.mp4, seg_1.m4s, seg2,m4s,sge5.m4s) into one mp4 file. This the example of what I am trying to do. I have followed this thread (" Combine MPEG-DASH segments (ex, init.mp4 + segments.m4s) back to a full source.mp4? ") but there is a problem while combining the specific m4s segments, while doing that it frames feazed in after seg2 and in seg5 it played again. Reference: FFmpeg example 来源： https://stackoverflow.com/questions/55701262/combine

I have created fixed length segments for a long MP4 video using Mp4Box. Mp4Box creates a meta info file mv_init.mp4 and segments like mv_1.m4s , mv_2.m4s , … I stream the video using HTML5 Media Source Extensions and the streaming is working properly. The problem is that I am unable to utilize time seeking feature of my HTML5 player . When a user uses the seekbar to seek to another time point, I need to fetch the correct segment file ( mv_{number}.m4s ) for that currentTime . For example: video duration: 2 hours segment size: 10 seconds user seeks to time: 25 minutes 25 minutes = 25 × 60

I am looking to convert between HLS and MPEG Dash. I do not access to the original fully concatenated video file, only the individual HLS segments. In doing this transformation to MPEG Dash I need to supply an initialziation segment for the Dash manifest .mpd file. My questions are: What is the structure of a Dash video initialization segment? How can I generate/create one without the need for the original full file? Perhaps a solution would involve getting MP4Box to convert the '.ts' HLS segments to Dash '.m4s' segments which are self initializing, but I am unsure how to go about this this?