[FFmpeg-user] mp4 generate moov atom at beginning of recording

[Paul B Mahol]

On 8/19/13, Robert Krueger <krueger at lesspain.de> wrote:
> On Mon, Aug 19, 2013 at 4:39 PM, Tom Evans <tevans.uk at googlemail.com>
> wrote:
>> On Sun, Aug 18, 2013 at 3:04 AM, simon mares <simon.mares at gmail.com>
>> wrote:
>>> Hello, is it possible to generate a pre-defined moov atom for fixed
>>> lenght
>>> of fe. 8 hours with use of
>>> http://ffmpeg.org/ffmpeg-all.html#MOV_002fMP4_002fISMV arguments? Video
>>> would never be seeked beyond the real duration, as I would not allow.
>>>
>>> Reason for doing this is that I'm experimenting with something and I
>>> would
>>> like to playback the file that I'm still recording, so it's kind of a
>>> live-streaming, but it's only used locally. As I'm only transcoding from
>>> .ts
>>> to .mp4 file no CPU is used, this is also my goal.
>>>
>>> Codec is h264, 720p, 25pfs. Video is generated with blackmagic
>>> pro-recorder.
>>>
>>
>> Just use "-movflags faststart".
> Are you sure this will result in a file he can play back while it is
> being written? If the docs are correct, I doubt it will.
>

Of course it will not play back while it is still recording.
That flag just move moov atom from end of file to start of file at end
of muxing.