[Libav-user] Can't Open MJPEG Encoder

[Tom Distler]

Hello,

avcodec_open() is returning -1 when I try to open the MJPEG encoder.
However, avcodec_open() succeeds when creating the MPEG-4 encoder with the
same context settings.

Here's the code that *fails* with MJPEG and *succeeds* with MPEG-4:

Thx!

-----

    AVCodec* _codec;
    AVCodecContext* _codecContext;

-----

        avcodec_register_all();
        avcodec_get_context_defaults2( _codecContext, CODEC_TYPE_VIDEO );

        _codecContext->codec_id = CODEC_ID_MJPEG;  //MPEG4
        _codecContext->codec_type = CODEC_TYPE_VIDEO;

        _codecContext->time_base.num = 1;
        _codecContext->time_base.den = 30;

        _codecContext->pix_fmt = PIX_FMT_YUV420P;

        _codecContext->bit_rate = 1024 * 1024;
        _codecContext->width = 704;
        _codecContext->height = 480;

        _codec = avcodec_find_encoder(CODEC_ID_MJPEG);  // MPEG4

        int res = avcodec_open( _codecContext, _codec );
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