[FFmpeg-user] fMP4 generation speed

[Ronak]

> On Jun 22, 2018, at 4:31 PM, Ronak <ronak2121-at-yahoo.com at ffmpeg.org> wrote:
> 
> 
> 
>> On Jun 22, 2018, at 3:59 PM, David Favor <david at davidfavor.com> wrote:
>> 
>> I'd say you're looking at a very long transcode time,
>> as your video dump shows...
>> 
>>  Duration: 52:15:29.84, start: 0.000000, bitrate: 63 kb/s
>> 
>> So... a 52 hour video... well... better fire up the popcorn
>> maker + settle in for a very long night...
> 
> 
> This is not video, only AAC audio. And there shouldn't be any transcoding here. I'm using -codec copy. We're going from MP4 -> fMP4 here.

We have audio files that are more than 100 hours long, and we need them to be fragmented quickly. It totally seems like there's an I/O problem here because fragmentation is faster the longer we set our fragment size to.
I don't imagine the cost of creating more fMP4 boxes would tax the CPU and slow everything down.

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