[FFmpeg-devel] [PATCH v2] movenc: Add an option for hiding fragments at the end

[Gyan Doshi]

On 2024-06-14 02:18 am, Martin Storsjö wrote:
> On Thu, 13 Jun 2024, Gyan Doshi wrote:
>
>> On 2024-06-13 06:20 pm, Martin Storsjö wrote:
>>> On Wed, 5 Jun 2024, Martin Storsjö wrote:
>>>
>>>> This allows ending up with a normal, non-fragmented file when
>>>> the file is finished, while keeping the file readable if writing
>>>> is aborted abruptly at any point. (Normally when writing a
>>>> mov/mp4 file, the unfinished file is completely useless unless it
>>>> is finished properly.)
>>>>
>>>> This results in a file where the mdat atom contains (and hides)
>>>> all the moof atoms that were part of the fragmented file structure
>>>> initially.
>>>> ---
>>>> v2: Made the flag implicitly set FF_MOV_FLAG_FRAGMENT (as it makes
>>>> no sense without it).
>>>>
>>>> Updated the description of the flag to "Write a fragmented file that
>>>> is converted to non-fragmented at the end".
>>>>
>>>> Kept the flag named "hide_fragments", but I'm also pondering if we
>>>> maybe should go for a name like "hybrid_fragmented" or so, as a
>>>> better description of _what_ it produces, as opposed to _how_ it
>>>> does things. (One could also consider "hybrid_mp4", but even if mp4
>>>> is the main thing, the same also goes for mov and a bunch of other
>>>> related formats.)
>>>
>>> I'd otherwise want to push this, but I'm not entirely satisfied with 
>>> the option name quite yet. I'm pondering if we should call it 
>>> "hybrid_fragmented" - any opinions, Dennis or Timo?
>>
>> How about `resilient_mode` or `recoverable`?
>> I agree that the how is secondary.
>
> Those are good suggestions as well - but I think I prefer 
> "hybrid_fragmented" still.
>
> In theory, I guess one could implement resilient writing in a number 
> of different ways, whereas the hybrid fragmented/non-fragmented only 
> is one.
>
> So with a couple other voices agreeing with the name 
> "hybrid_fragmented", I'll post a new patch with the option in that 
> form - hopefully you don't object to it.

The term hybrid is not applicable here. The fragmented state is 
transient during writing and contingent in the finished artifact 
depending on how the writing process concluded.
Hybrid implies both modes available e.g.. a hybrid vehicle can use both 
types of energy sources. The artifact here will be one _or_ the other.

Regards,
Gyan