how can i use libx264 in avconv?

**VdubVidiot** · June 18th, 2012

Can anyone please help me to learn how I can make my video output with libx264?
I am using ubuntu 12.4 LTE 64bit and I am a noob.

Thanks in advance.

avconv -i /home/brandon/Downloads/Sintel_1080.mkv -i /home/brandon/Downloads/sintel_trailer-audio.flac -c:v libx264 -pix_fmt yuv422p -g 0 -c:a pcm_s24le -t 44 108042230i.mov
avconv version 0.8.1-4:0.8.1-0ubuntu1, Copyright (c) 2000-2011 the Libav developers
built on Mar 22 2012 05:09:06 with gcc 4.6.3
[matroska,webm @ 0x137c7a0] Estimating duration from bitrate, this may be inaccurate
Input #0, matroska,webm, from '/home/brandon/Downloads/Sintel_1080.mkv':
Metadata:
ENCODER : Lavf53.21.0
Duration: 00:00:41.76, start: 0.000000, bitrate: N/A
Stream #0.0: Video: mpeg4 (Simple Profile), yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 30 fps, 30 tbr, 1k tbn, 30 tbc (default)
[flac @ 0x1397580] max_analyze_duration reached
Input #1, flac, from '/home/brandon/Downloads/sintel_trailer-audio.flac':
Duration: 00:00:52.00, bitrate: 721 kb/s
Stream #1.0: Audio: flac, 48000 Hz, 2 channels, s16
Unknown encoder 'libx264'

**VdubVidiot** · June 18th, 2012

the problem seems to have fixed itself after the following software removals and reinstallations:

**OnOffPT** · August 15th, 2012

For me it worked fine installing libavcodec-extra-53.
apt-get install libavcodec-extra-53

Run the following command before and after installing the libavcodec-extra-53 package:
avconv -codecs | grep "264"

You should see a new line with libx264 as below
avconv version 0.8.3-4:0.8.3-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the Libav developers
built on Jun 12 2012 16:52:09 with gcc 4.6.3
D V D h264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
D V D h264_vdpau H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (VDPAU acceleration)
EV libx264 libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10