[Libav-user] avcodec_open2 returns -22

Kevin J. Brooks kbrooks at r2c-ss.com
Wed Jun 17 23:30:33 CEST 2015

I am setting the AudioCodec to MP3,  I am using the pre-built libraries 
the code I have the causes the issue is from the code for the QtMEL 
library.  What I am posting here is the Audio Codec setup for the QtMel 
object.  I hope it helps.

BTW I am using H264 for the Video Codec.  If I record video only, it 
does work, it is only if I try to add sound that it fails.

CR2CAudioFormat format;




I really don't have a preference for the codec, I just need to know how 
to set it up properly. I am totally new at recording video and audio.

On 6/17/2015 1:08 AM, Taha Ansari wrote:
> On Wed, Jun 17, 2015 at 2:17 AM, Gonzalo Garramuno <ggarra13 at gmail.com 
> <mailto:ggarra13 at gmail.com>> wrote:
>     On 16/06/15 09:06, Kevin J. Brooks wrote:
>         Yes I am.  For more information, I am developing on Windoze 7.
>     avcodec_open2 can fail if you lack the library for the codec you
>     want to decode or encode.  For example, libx264.  The libraries in
>     ffmpeg.zeranoe.com <http://ffmpeg.zeranoe.com> contain all codecs,
>     but they are GPL only.  You should try them first and see if the
>     problem goes away.  If it does, you know you have to compile
>     ffmpeg with different flags.
> Since he mentions Windows 7, I assume he is using pre-built packages 
> from zeranoe site (as you mention). These builds contain proprietary 
> codec(s) like x264 (non GPL).
> @Kevin: maybe you have some bare minimum code with you that can 
> produce this error, which people can have a look?
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