[FFmpeg-devel] [PATCH] lavf: add ffprobe demuxer

[Josh de Kock]

On 29/09/2016 00:21, Stefano Sabatini wrote:
> On date Monday 2016-09-26 18:55:47 +0200, wm4 encoded:
>> On Sun, 25 Sep 2016 19:32:37 +0200
>> Stefano Sabatini <stefasab at gmail.com> wrote:
> [...]
>>>>> My use case: I need to build a data stream with scripting/manual
>>>>> editing. Since I don't want to have to rely on a binary format (which
>>>>> is not ideal for that use case) I needed a format simple enough to be
>>>>> written and analysed without special tools, but with a simple text
>>>>> editor.
>>>>
>>>> I still don't get it. Your description makes me think of something like
>>>> EDL, but that doesn't seem to have anything to do with it.
>>>
>>> EDL as "Edit Decision List"? No I don't think this is related at
>>> all.
>>>
>>> Suppose you want to inject a data stream, you have the data and you
>>> know where to insert it given its PTS. With this muxer you can
>>> handcraft a textual file in the ffprobe_default format and use ffmpeg
>>> to inject the new data stream.
>>
>
>> What's a "data stream"?
>
> A stream consisting of generic data, that is a stream with type
> AV_MEDIA_TYPE_DATA.
>
>> Inject into what?
>
> Interleave the stream with other media streams (audio, video,
> etc.). This can be done via remuxing (no need for transcoding).
>
>> And why?
>
> Data stream could be used to insert custom information for
> post-processing (e.g. they might contain advertising information).
>

Are you sure this cannot be done from outside of libav*? It really seems 
like something which wouldn't actually be very useful for anyone else. 
It's also just another hack in for a non-standardised, exclusive format. 
Lavf is really not a good fit for this and it should be done outside of 
libav*.

--
Josh