[FFmpeg-user] Naming chapters in Matroska video

[John Finlay]

On 2/18/2021 5:48 PM, Jim DeLaHunt wrote:
> On 2021-02-18 15:05, Paul B Mahol wrote:
>
>> Everything  is explained in documentation. My time is very limited.
>
> No, not everything about FFmpeg's handling of metadata is explained in 
> FFmpeg's documentation. For example, the -map_metdata section[1] does 
> not link to the -map_chapters[2] section nor to the Metadata[3] 
> section of the documentation.  None of those three places explain 
> FFmpeg's data model for metadata: that is, what metadata is, what its 
> contents can be, how it relates to the media content. The 
> -map_chapters section talks about "chapters" without defining what 
> that term means.  I could list many more things which are not 
> explained in the documentation.
>
> Your are of course entitled to limit the time you spend answering 
> questions here. You do regularly answer questions here, and that is a 
> generous gift. Thank you. But you are not entitled to pretend that the 
> documentation explains fully, when it does not.
>
> [1] http://ffmpeg.org/ffmpeg-all.html#Advanced-options, search for 
> "-map_metadata"
> [2] http://ffmpeg.org/ffmpeg-all.html#Advanced-options, search for 
> "-map_chapters"
> [3] http://ffmpeg.org/ffmpeg-all.html#Metadata-1
>
> Best regards,
>     —Jim DeLaHunt
>
>

If the documentation for Metadata is correct then there is a bug in 
ffmpeg because the example commands to extract, edit and reinsert the 
edited metadata do not work for chapter metadata.

John