[FFmpeg-devel] [PATCH] Enable dash output to work when the output isn't a local file

Ganesh Ajjanagadde gajjanag at mit.edu
Mon Jan 4 19:05:26 CET 2016

On Mon, Jan 4, 2016 at 9:12 AM, Derek Buitenhuis
<derek.buitenhuis at gmail.com> wrote:
> On 1/4/2016 4:46 PM, Ganesh Ajjanagadde wrote:
>> Yes, this is strange. url_move points to file_move, and the only
>> system functionality it relies on is rename, available in stdio.h. The
>> semantics vary from system to system, with some details specified in
>> POSIX, but rename itself is standard C:
>> http://en.cppreference.com/w/c/io/rename.
>> As the code is recent, dating to this year's gsoc, 824a82d1b8, it may
>> not be too surprising that this was not addressed yet.
> I know rename is not atomic on Windows, if that matters.

Nothing in the docs for url_move requires that the callback be atomic,
though it is indeed a very useful property here.

Personally, I think it should be ok to use rename here for now,
especially since even projects like Python had trouble with this
aspect: https://bugs.python.org/issue8828. Someone with greater
Windows expertise can then examine the validity of
where there seems to be a lack of clarity, and perhaps make a better
effort at an atomic rename operation for Windows.

> - Derek
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