Public bug reported:

If I try to convert a video using h264 codec, I get the error

Unknown encoder 'lib264'

For example:

ffmpeg -i input -vcodec libx264 output.mp4

However doing the same with avconv works:

avconv -i input -vcodec libx264 output.mp4

aptitude search libavcodec gives:

p   libavcodec-dev                  - Development files for libavcodec          
p   libavcodec-dev:i386             - Development files for libavcodec          
i   libavcodec-extra                - Libav codec library (additional codecs met
i   libavcodec-extra-56             - Libav codec library (additional codecs)   
p   libavcodec-extra-56:i386        - Libav codec library (additional codecs)   
p   libavcodec-ffmpeg-dev           - FFmpeg library with de/encoders for audio/
p   libavcodec-ffmpeg-dev:i386      - FFmpeg library with de/encoders for audio/
i A libavcodec-ffmpeg56             - FFmpeg library with de/encoders for audio/
p   libavcodec-ffmpeg56:i386        - FFmpeg library with de/encoders for audio/
c   libavcodec53                    - Libav codec library                       
c   libavcodec54                    - Libav codec library                       
c   libavcodec56                    - Libav codec library                       
p   libavcodec56:i386               - Libav codec library

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: ffmpeg 7:2.5.7-0ubuntu0.15.04.1
ProcVersionSignature: Ubuntu 3.19.0-23.24-generic 3.19.8-ckt2
Uname: Linux 3.19.0-23-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: amd64
CurrentDesktop: GNOME
Date: Sun Jul 26 13:56:40 2015
InstallationDate: Installed on 2013-11-22 (611 days ago)
InstallationMedia: Lubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
SourcePackage: ffmpeg
UpgradeStatus: Upgraded to vivid on 2015-06-29 (27 days ago)

** Affects: ffmpeg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug vivid

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

Title:
  Unknown encoder 'libx264'

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