ffmpeg.c:2823: error: Null Dereference
  pointer `codec` last assigned on line 2816 could be null and is dereferenced at line 2823, column 8.

ffmpeg.c:2809:1: start of procedure find_codec_or_die()
2807. }
2808. 
2809. static enum CodecID find_codec_or_die(const char *name, int type, int encoder)
      ^
2810. {
2811.     const char *codec_string = encoder ? "encoder" : "decoder";

ffmpeg.c:2811:32: Condition is true
2809. static enum CodecID find_codec_or_die(const char *name, int type, int encoder)
2810. {
2811.     const char *codec_string = encoder ? "encoder" : "decoder";
                                     ^
2812.     AVCodec *codec;
2813. 

ffmpeg.c:2811:5: 
2809. static enum CodecID find_codec_or_die(const char *name, int type, int encoder)
2810. {
2811.     const char *codec_string = encoder ? "encoder" : "decoder";
          ^
2812.     AVCodec *codec;
2813. 

ffmpeg.c:2814:9: Taking false branch
2812.     AVCodec *codec;
2813. 
2814.     if(!name)
              ^
2815.         return CODEC_ID_NONE;
2816.     codec = encoder ?

ffmpeg.c:2816:13: Condition is true
2814.     if(!name)
2815.         return CODEC_ID_NONE;
2816.     codec = encoder ?
                  ^
2817.         avcodec_find_encoder_by_name(name) :
2818.         avcodec_find_decoder_by_name(name);

ffmpeg.c:2816:5: 
2814.     if(!name)
2815.         return CODEC_ID_NONE;
2816.     codec = encoder ?
          ^
2817.         avcodec_find_encoder_by_name(name) :
2818.         avcodec_find_decoder_by_name(name);

ffmpeg.c:2819:9: Taking true branch
2817.         avcodec_find_encoder_by_name(name) :
2818.         avcodec_find_decoder_by_name(name);
2819.     if(!codec) {
              ^
2820.         fprintf(stderr, "Unknown %s '%s'\n", codec_string, name);
2821.         av_exit(1);

ffmpeg.c:2820:9: 
2818.         avcodec_find_decoder_by_name(name);
2819.     if(!codec) {
2820.         fprintf(stderr, "Unknown %s '%s'\n", codec_string, name);
              ^
2821.         av_exit(1);
2822.     }

ffmpeg.c:2821:9: Skipping av_exit(): empty list of specs
2819.     if(!codec) {
2820.         fprintf(stderr, "Unknown %s '%s'\n", codec_string, name);
2821.         av_exit(1);
              ^
2822.     }
2823.     if(codec->type != type) {

ffmpeg.c:2823:8: 
2821.         av_exit(1);
2822.     }
2823.     if(codec->type != type) {
             ^
2824.         fprintf(stderr, "Invalid %s type '%s'\n", codec_string, name);
2825.         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}']