ffmpeg.c:2836: error: Null Dereference
  pointer `codec` last assigned on line 2829 could be null and is dereferenced at line 2836, column 8.

ffmpeg.c:2822:1: start of procedure find_codec_or_die()
2820. }
2821. 
2822. static enum CodecID find_codec_or_die(const char *name, int type, int encoder)
      ^
2823. {
2824.     const char *codec_string = encoder ? "encoder" : "decoder";

ffmpeg.c:2824:32: Condition is true
2822. static enum CodecID find_codec_or_die(const char *name, int type, int encoder)
2823. {
2824.     const char *codec_string = encoder ? "encoder" : "decoder";
                                     ^
2825.     AVCodec *codec;
2826. 

ffmpeg.c:2824:5: 
2822. static enum CodecID find_codec_or_die(const char *name, int type, int encoder)
2823. {
2824.     const char *codec_string = encoder ? "encoder" : "decoder";
          ^
2825.     AVCodec *codec;
2826. 

ffmpeg.c:2827:9: Taking false branch
2825.     AVCodec *codec;
2826. 
2827.     if(!name)
              ^
2828.         return CODEC_ID_NONE;
2829.     codec = encoder ?

ffmpeg.c:2829:13: Condition is true
2827.     if(!name)
2828.         return CODEC_ID_NONE;
2829.     codec = encoder ?
                  ^
2830.         avcodec_find_encoder_by_name(name) :
2831.         avcodec_find_decoder_by_name(name);

ffmpeg.c:2829:5: 
2827.     if(!name)
2828.         return CODEC_ID_NONE;
2829.     codec = encoder ?
          ^
2830.         avcodec_find_encoder_by_name(name) :
2831.         avcodec_find_decoder_by_name(name);

ffmpeg.c:2832:9: Taking true branch
2830.         avcodec_find_encoder_by_name(name) :
2831.         avcodec_find_decoder_by_name(name);
2832.     if(!codec) {
              ^
2833.         fprintf(stderr, "Unknown %s '%s'\n", codec_string, name);
2834.         av_exit(1);

ffmpeg.c:2833:9: 
2831.         avcodec_find_decoder_by_name(name);
2832.     if(!codec) {
2833.         fprintf(stderr, "Unknown %s '%s'\n", codec_string, name);
              ^
2834.         av_exit(1);
2835.     }

ffmpeg.c:2834:9: Skipping av_exit(): empty list of specs
2832.     if(!codec) {
2833.         fprintf(stderr, "Unknown %s '%s'\n", codec_string, name);
2834.         av_exit(1);
              ^
2835.     }
2836.     if(codec->type != type) {

ffmpeg.c:2836:8: 
2834.         av_exit(1);
2835.     }
2836.     if(codec->type != type) {
             ^
2837.         fprintf(stderr, "Invalid %s type '%s'\n", codec_string, name);
2838.         av_exit(1);

static enum CodecID find_codec_or_die(const char *name, int type, int encoder)
{
    const char *codec_string = encoder ? "encoder" : "decoder";
    AVCodec *codec;
    if(!name)
        return CODEC_ID_NONE;
    codec = encoder ?
        avcodec_find_encoder_by_name(name) :
        avcodec_find_decoder_by_name(name);
    if(!codec) {
        fprintf(stderr, "Unknown %s '%s'\n", codec_string, name);
        av_exit(1);
    }
    if(codec->type != type) {
        fprintf(stderr, "Invalid %s type '%s'\n", codec_string, name);
        av_exit(1);
    }
    return codec->id;
}
['static enum CodecID find_codec_or_die(const char *name, int type, int encoder)\n{\n    const char *codec_string = encoder ? "encoder" : "decoder";\n    AVCodec *codec;\n    if(!name)\n        return CODEC_ID_NONE;\n    codec = encoder ?\n        avcodec_find_encoder_by_name(name) :\n        avcodec_find_decoder_by_name(name);\n    if(!codec) {\n        fprintf(stderr, "Unknown %s \'%s\'\\n", codec_string, name);\n        av_exit(1);\n    }\n    if(codec->type != type) {\n        fprintf(stderr, "Invalid %s type \'%s\'\\n", codec_string, name);\n        av_exit(1);\n    }\n    return codec->id;\n}']