For example:

(As input I used
http://media.xiph.org/video/derf/y4m/park_joy_1080p50.y4m (named as
input.y4m))

ffmpeg -i input.y4m -vcodec libx264 out.mp4
ffmpeg version 2.6.2 Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  configuration: 
  libavutil      54. 20.100 / 54. 20.100
  libavcodec     56. 26.100 / 56. 26.100
  libavformat    56. 25.101 / 56. 25.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 11.102 /  5. 11.102
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
[yuv4mpegpipe @ 0x1fbe1c0] Stream #0: not enough frames to estimate rate; 
consider increasing probesize
Input #0, yuv4mpegpipe, from 'input.y4m':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1920x1080, SAR 
1:1 DAR 16:9, 50 fps, 50 tbr, 50 tbn, 50 tbc
Unknown encoder 'libx264'

However avconv instead of ffmpeg works.

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https://bugs.launchpad.net/bugs/1478337

Title:
  Unknown encoder 'libx264'

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