[x264enc] - Can not initialize x264 encoder.

[IamTrying]

How can i fix this error? While using `x264 pass=18 quantizer=51` i always
get this following stats file and can not initialize x264 error. 

Tried also: multipass-cache-file=/tmp/x264.log no luck.

----
0:00:00.140352545 11283      0x15c3360 ERROR                x264enc
:0::<x264enc0> ratecontrol_init: can't open stats file

ERROR: from element /GstPipeline:pipeline0/GstX264Enc:x264enc0: Can not
initialize x264 encoder.
Additional debug info:
gstx264enc.c(1269): gst_x264_enc_init_encoder ():
/GstPipeline:pipeline0/GstX264Enc:x264enc0
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
/GstPipeline:pipeline0/GstFFMpegCsp:ffmpegcsp0.GstPad:src: caps = NULL
/GstPipeline:pipeline0/GstFFMpegCsp:ffmpegcsp0.GstPad:sink: caps = NULL
/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:src: caps = NULL
/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:sink: caps = NULL
/GstPipeline:pipeline0/GstVideoScale:videoscale0.GstPad:src: caps = NULL
/GstPipeline:pipeline0/GstVideoScale:videoscale0.GstPad:sink: caps = NULL
/GstPipeline:pipeline0/GstDecodeBin2:decodebin20.GstDecodePad:src0: caps =
NULL
/GstPipeline:pipeline0/GstDecodeBin2:decodebin20/ffdec_ac3:ffdec_ac30.GstPad:sink:
caps = NULL
/GstPipeline:pipeline0/GstDecodeBin2:decodebin20/GstCapsFilter:capsfilter1.GstPad:src:
caps = NULL
/GstPipeline:pipeline0/GstDecodeBin2:decodebin20/GstCapsFilter:capsfilter1.GstPad:sink:
caps = NULL
/GstPipeline:pipeline0/GstDecodeBin2:decodebin20/GstAc3Parse:ac3parse0.GstPad:src:
caps = NULL
/GstPipeline:pipeline0/GstDecodeBin2:decodebin20/GstAc3Parse:ac3parse0.GstPad:sink:
caps = NULL
/GstPipeline:pipeline0/GstDecodeBin2:decodebin20/ffdec_msmpeg4v2:ffdec_msmpeg4v20.GstPad:src:
caps = NULL
/GstPipeline:pipeline0/GstDecodeBin2:decodebin20/ffdec_msmpeg4v2:ffdec_msmpeg4v20.GstPad:sink:
caps = NULL
/GstPipeline:pipeline0/GstDecodeBin2:decodebin20/GstMultiQueue:multiqueue0.GstPad:sink1:
caps = NULL
/GstPipeline:pipeline0/GstDecodeBin2:decodebin20/GstMultiQueue:multiqueue0.GstPad:src1:
caps = NULL
/GstPipeline:pipeline0/GstDecodeBin2:decodebin20/GstMultiQueue:multiqueue0.GstPad:sink0:
caps = NULL
/GstPipeline:pipeline0/GstDecodeBin2:decodebin20/GstMultiQueue:multiqueue0.GstPad:src0:
caps = NULL
/GstPipeline:pipeline0/GstDecodeBin2:decodebin20/GstAviDemux:avidemux0.GstPad:audio_00:
caps = NULL
/GstPipeline:pipeline0/GstDecodeBin2:decodebin20/GstAviDemux:avidemux0.GstPad:video_00:
caps = NULL
/GstPipeline:pipeline0/GstDecodeBin2:decodebin20/GstAviDemux:avidemux0.GstPad:sink:
caps = NULL
/GstPipeline:pipeline0/GstDecodeBin2:decodebin20/GstTypeFindElement:typefind.GstPad:src:
caps = NULL
Freeing pipeline ...


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