[Libav-user] avcodec_open2 returns -22

Kevin J. Brooks kbrooks at r2c-ss.com
Thu Jun 18 00:53:54 CEST 2015

I changed the Audio codec to WMAV2, and left the rest of the AudioCodec 
settings the same Now the program crashes at this line in the QtMel code:

int outSize = avcodec_encode_audio(m_audioStream->codec, 
m_audioOutputBuffer, m_audioOutputBufferSize, (short *)samples.data());

In debug the error staates "Stopped in thread 2 by:Exception at 
0x66364c62, cod:0xc0000005: write access violation at:0x1, flags=0x0 
(first chance).

I suspect I don't have the audio settings set write, but I am not sure 
how to set them for WMAV2.

On 6/17/2015 4:30 PM, Kevin J. Brooks wrote:
> 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;
>      format.setChannelCount(2);
>      format.setSampleRate(44100);
>      format.setFormat(CR2CAudioFormat::SignedInt16);
> 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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