On 06/21/2018 11:59 PM, Carl Eugen Hoyos wrote:
2018-06-20 16:50 GMT+02:00, Ariel Frailich <ar...@websiteatelier.com>:
Input: mostly ProRes (10-20Gb), HD to 4K res, 90 mins average length.
Output: a set of .mp4 files at 5 different resolutions, up to 1080.
These are further processed (primarily bento4) to create multiple/
variable bitrate HLS and DASH streams, with encryption and DRM.
(The most important information would be the target codec.)
On our office machine (iMac, 3.2 GHz Intel Core i5, 8Gb, macOS
Sierra), encoding typically takes 6-7 hours per film. Ideally, we
would like to cut this down to 1-2 hours.
WHAT WE NEED TO KNOW
1. Hardware: what's a good hardware configuration for our needs?
That depends on the question if you want hardware or software
encoding (that nobody here can answer, only you).
CPUs, cores, RAM, RAM disk, graphics cards, etc.
The more cpu cores the faster software encoding is, you
will find information online about the performance of
graphic cards for hardware encoding.
just for completeness Carl - although I doubt it applies to these high
performance/quality requirements- ffmpeg can deliver hardware encoding
support if the system on chip has a hardware encoder, runs Linux and
there is a v4l2 m2m kernel driver for it (this would bypass the need for
a graphic card). An example of a board that would meet these usability
requirements https://developer.qualcomm.com/hardware/dragonboard-820c.
performance and quality will vary from SoC to Soc.
Also, which version of Linux is recommended (or which to avoid).
No limitations known.
(musl 32bit is unsupported which we are not allowed to
document but this will not hit you.)
2. ffmpeg setup: how should ffmpeg be compiled to best take
advantage of the particular hardware configuration?
$ ./configure --enable-gpl && make for hardware encoding,
$ ./configure --enable-gpl --enable-libx264 && make for
software encoding.
3. Video processing: how should ffmpeg be run to maximize
speed and efficiency, and to produce the most suitable files
for our needs?
I may misunderstand (and this is possibly not an FFmpeg-
related question) but for software encoding, remember that
threads do not scale well, single-threaded encoding (of
multiple files at the same time) is always most efficient.
Carl Eugen
PS: In case you don't know: Hardware encoding is potentially
faster than software encoding but provides worse quality for
a given bitrate or larger files for a given quality.
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