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运行mkv-writer-test.cpp， 将flv文件转换为mkv文件，mkv有视频无音频。 #136

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asmgcc opened this issue Mar 30, 2021 · 6 comments
Open

运行mkv-writer-test.cpp， 将flv文件转换为mkv文件，mkv有视频无音频。 #136

asmgcc opened this issue Mar 30, 2021 · 6 comments

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@asmgcc
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asmgcc commented Mar 30, 2021

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@asmgcc
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asmgcc commented Mar 30, 2021

FLV内部为 h265+aac 数据格式

@ireader
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ireader commented Mar 30, 2021

未复现你的问题，上传下测试文件？

@asmgcc
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asmgcc commented Mar 30, 2021

2021_03_30_192327_00.zip
测试flv文件，请将后缀zip修改为rar再解压。

@ireader
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ireader commented Mar 31, 2021

定位的原因是flv文件只有视频sequence header，没有音频sequence header，导致mkv只写入了视频track，音频track丢弃了。

image

@ireader
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ireader commented Mar 31, 2021

mkv目前需要先addtrack，然后才能写音视频数据。

这块我看看怎么改一下。

@asmgcc
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asmgcc commented Mar 31, 2021

这个flv文件是利用media-server/libflv 库mux出来的， 是只有视频轨无音频轨吗，但是播放器播放可以听到声音。
还有一个问题反馈一下：利用libmkv 将一个h265文件和aac文件 mux成mkv，如果先添加video track后添加audio track，那么mux出来mkv文件播放只有视频无音频， 如果先添加audio track后添加video track，mkv播放只有音频无视频。

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@ireader @asmgcc