[FFmpeg-trac] #3020(undetermined:new): FFMPEG performance need optimize when transcoding to mjpeg

FFmpeg trac at avcodec.org
Wed Oct 2 13:31:02 CEST 2013


#3020: FFMPEG performance need optimize when transcoding to mjpeg
-------------------------------------+-------------------------------------
             Reporter:  kaifu.tang   |                    Owner:
                 Type:  enhancement  |                   Status:  new
             Priority:  normal       |                Component:
              Version:  2.0.1        |  undetermined
             Keywords:  mjpeg        |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------
Changes (by cehoyos):

 * keywords:  transcoder, mjpeg, avfilter, performance => mjpeg
 * component:  avfilter => undetermined


Comment:

 Please test (and report) all issues with current git head.

 Could you elaborate a little on the problem you have? Iiuc, you are
 reporting that the msmpeg4 encoder is faster than the mjpeg encoder but I
 am not sure that this is a useful explanation / that they can be compared
 like this.
 An enhancement request for a faster mjpeg encoder is probably valid but I
 wonder if this is everything this issue is about...

 Note that you cannot avoid the scaling step (the scaler is also
 responsible for colour-space conversion), your h264 input sample has a
 different colour space than mjpeg (while msmpeg4 has the same as your h264
 sample). So if this is your problem, I don't think there is anything that
 can be fixed about it.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/3020#comment:4>
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