After update Kubuntu from 15 to 16.04 render in Kdenlive was broken.

This is properties of source videos (screencasts)

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Stream #0:0: Video: h264 (High) (H264 / 0x34363248), yuv420p(tv, bt709), 1280x800 [SAR 1:1 DAR 8:5], 517 kb/s, 24 fps, 24 tbr, 24 tbn, 48 tbc

(I recorded sources before update Kubuntu)

And this is render parameters:

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f=mp4 hq=1 acodec=aac ab=%audiobitrate+'k' ar=48000 pix_fmt=yuv420p vcodec=libx264 minrate=0 vb=%bitrate+'k' g=250 bf=3 b_strategy=1 subcmp=2 cmp=2 coder=1 flags=+loop flags2=dct8x8 qmax=51 subq=7 qmin=10 qcomp=0.6 qdiff=4 trellis=1 aspect=%dar pass=%passes fps=24

Before update Kubuntu rendered videos was:
- size same source (1280x800)
- 24 fps
- sound without empty places

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  Stream #0:1(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv), 1280x800 [SAR 1:1 DAR 8:5], 1455 kb/s, 24 fps, 24 tbr, 24 tbn, 48 tbc (default)


After update Kubuntu rendered videos steel:
- another size 720x576
- 25 fps (before was 24)
- sound with small emty plases, some like this: +++++ - ++++++++ - ++++++++ - +++++++++++

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Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709/unknown/bt709), 720x576 [SAR 32:25 DAR 8:5], 365 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)

I tryed add "width=1280 height=800 fps=24/1" to render parameters

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f=mp4 hq=1 acodec=aac ab=%audiobitrate+'k' ar=48000 pix_fmt=yuv420p vcodec=libx264 minrate=0 vb=%bitrate+'k' g=250 bf=3 b_strategy=1 subcmp=2 cmp=2 coder=1 flags=+loop flags2=dct8x8 qmax=51 subq=7 qmin=10 qcomp=0.6 qdiff=4 trellis=1 aspect=%dar pass=%passes width=1280 height=800 fps=24/1

But it solve just size (1280x800).
Sound left with empty places and fps left 25.

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Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709/unknown/bt709), 1280x800 [SAR 1:1 DAR 8:5], 724 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)

How can I fix sound and fps?

solved by update to 16.04.0 version