Am 04.09.2016 um 14:45 schrieb Carl Eugen Hoyos:
2016-09-04 14:38 GMT+02:00 Reindl Harald <h.rei...@thelounge.net>:

Am 04.09.2016 um 14:32 schrieb Carl Eugen Hoyos:

2016-09-04 14:00 GMT+02:00 Reindl Harald <h.rei...@thelounge.net>:

Am 04.09.2016 um 13:57 schrieb Peter White:

But the encoding time doubles--not worth it

with smart params it don't double

the first pass can be with a faster profile

and skip audio entirely

This can have bad effects with FFmpeg and x264:
If you are lucky, you get a crash, in the worst case,
encoding succeeds but you get worse quality than
one-pass (wrong frames get the low quantizers)

given that we use it for a long time now as default in our
ffmpeg-wrapper, files are typically smaller than with
single-pass and the quality is as expected the point is "can"

long time means over years for all sort of videos

It depends on the output format and I suspect it also
depends on sync implementation that can change
without real notice.

Allow me to repeat that the true problem is that you may
not notice issues: Encoding succeeds but the quantizers
are incorrectly dsitributed (starting from the second frame).
You only get the crash if you are lucky

if i don't 'notice issues' which means for me i don't see bad quality and it plays on every device then there is no 'issue'

you get a 'crash' if you differ with completly incompatible params between the two passes

Attachment: signature.asc
Description: OpenPGP digital signature

_______________________________________________
ffmpeg-user mailing list
ffmpeg-user@ffmpeg.org
http://ffmpeg.org/mailman/listinfo/ffmpeg-user

To unsubscribe, visit link above, or email
ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".

Reply via email to