[FFmpeg-user] Error message 'Could not open codec' when running FFMPEG-codec.

[David Kempers]

On 18 March 2012 12:55, Anders Branderud <anders.branderud at gmail.com> wrote:

> Hello!
>
> I am running the following code:
>
> https://docs.google.com/document/d/1DbNpoy0MHNjS3ZV-6plaVdbmvW6g08riqtIz6fBO3ZE/edit
>
> Some excerpts:
> video_encode_example("/home/anders/grb_1.mpg", CODEC_ID_MPEG4);
>
> static void video_encode_example(const char *filename, int codec_id)
> {
>  {
>   //For full code see document attached above.
>     /* open it */
>    if (avcodec_open2(c, codec, NULL) < 0) {
>        fprintf(stderr, "could not open codec\n");
>        exit(1);
>    }
>
> }
>
> The message 'could not open codec' is printed out.
> video_encode_example("/home/anders/grb_1.mpg", CODEC_ID_MPEG2VIDEO);
> generates the same error message.
>
> How do I resolve this?
> Thanks in advance!
>
>
There's probably a wrong parameter with AVCodecContext.

Off the top of my head I can't remember if CODEC_ID_MPEG2VIDEO and
CODEC_ID_MPEG4 support b frames but I would try to set max_b_frames to 0.

Are all the other parameters the same as the example?