[FFmpeg-trac] #6651(ffmpeg:new): cut file without specifying codecs
FFmpeg
trac at avcodec.org
Tue Sep 12 14:22:30 EEST 2017
#6651: cut file without specifying codecs
-------------------------------------+-------------------------------------
Reporter: | Type:
Xoristzatziki | enhancement
Status: new | Priority: normal
Component: ffmpeg | Version:
Keywords: | unspecified
Blocking: | Blocked By:
Analyzed by developer: 0 | Reproduced by developer: 0
-------------------------------------+-------------------------------------
Summary of the enchancement:
Copy with as much codec parameters as possible in order to do a fair exact
cut. In current versions user should read audio and video codecs with
ffprobe, make effort to assign as much information as possible to ffmpeg
encoders and run the command. Since ffmpeg already know which ones of them
are compatible, ffmpeg '''at least''' could suggest them somehow. Ex. by
printing a suggested command line to use.
The ideal is to use them without any user intervention.
We could use:
ffmpeg -ss startminisecond -to endmillisecond infile.ext -c copyAMIAP
outfile
or
ffmpeg -read_intervals startminisecond:endmillisecond infile.ext -c
copyAMIAP
(outfile without extension, same extension as infile will be used)
to transcode a part of file using exact start, stop milliseconds without
the need to rewrite all relevant parameters (ex. codecs, sizes, fps's etc)
Since copyAMIAP (copy As Much Info As Possible) is a special parameter we
can not make any further warnings.
Having this as copy parameter, ffmpeg could also copyAMIAP from interval-
start to next K keyframe, exact copy from that point to last K keyframe
(if such exists), and finally copyAMIAP from that point to interval-end.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/6651>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
More information about the FFmpeg-trac
mailing list