ffmpeg.c:2821: error: Null Dereference
  pointer `codec` last assigned on line 2814 could be null and is dereferenced at line 2821, column 8.

ffmpeg.c:2807:1: start of procedure find_codec_or_die()
2805. }
2806. 
2807. static enum CodecID find_codec_or_die(const char *name, int type, int encoder)
      ^
2808. {
2809.     const char *codec_string = encoder ? "encoder" : "decoder";

ffmpeg.c:2809:32: Condition is false
2807. static enum CodecID find_codec_or_die(const char *name, int type, int encoder)
2808. {
2809.     const char *codec_string = encoder ? "encoder" : "decoder";
                                     ^
2810.     AVCodec *codec;
2811. 

ffmpeg.c:2809:5: 
2807. static enum CodecID find_codec_or_die(const char *name, int type, int encoder)
2808. {
2809.     const char *codec_string = encoder ? "encoder" : "decoder";
          ^
2810.     AVCodec *codec;
2811. 

ffmpeg.c:2812:9: Taking false branch
2810.     AVCodec *codec;
2811. 
2812.     if(!name)
              ^
2813.         return CODEC_ID_NONE;
2814.     codec = encoder ?

ffmpeg.c:2814:13: Condition is false
2812.     if(!name)
2813.         return CODEC_ID_NONE;
2814.     codec = encoder ?
                  ^
2815.         avcodec_find_encoder_by_name(name) :
2816.         avcodec_find_decoder_by_name(name);

ffmpeg.c:2814:5: 
2812.     if(!name)
2813.         return CODEC_ID_NONE;
2814.     codec = encoder ?
          ^
2815.         avcodec_find_encoder_by_name(name) :
2816.         avcodec_find_decoder_by_name(name);

ffmpeg.c:2817:9: Taking true branch
2815.         avcodec_find_encoder_by_name(name) :
2816.         avcodec_find_decoder_by_name(name);
2817.     if(!codec) {
              ^
2818.         fprintf(stderr, "Unknown %s '%s'\n", codec_string, name);
2819.         av_exit(1);

ffmpeg.c:2818:9: 
2816.         avcodec_find_decoder_by_name(name);
2817.     if(!codec) {
2818.         fprintf(stderr, "Unknown %s '%s'\n", codec_string, name);
              ^
2819.         av_exit(1);
2820.     }

ffmpeg.c:2819:9: Skipping av_exit(): empty list of specs
2817.     if(!codec) {
2818.         fprintf(stderr, "Unknown %s '%s'\n", codec_string, name);
2819.         av_exit(1);
              ^
2820.     }
2821.     if(codec->type != type) {

ffmpeg.c:2821:8: 
2819.         av_exit(1);
2820.     }
2821.     if(codec->type != type) {
             ^
2822.         fprintf(stderr, "Invalid %s type '%s'\n", codec_string, name);
2823.         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}']