ffmpeg.c:2810: error: Null Dereference
  pointer `codec` last assigned on line 2803 could be null and is dereferenced at line 2810, column 8.

ffmpeg.c:2796:1: start of procedure find_codec_or_die()
2794. }
2795. 
2796. static enum CodecID find_codec_or_die(const char *name, int type, int encoder)
      ^
2797. {
2798.     const char *codec_string = encoder ? "encoder" : "decoder";

ffmpeg.c:2798:32: Condition is true
2796. static enum CodecID find_codec_or_die(const char *name, int type, int encoder)
2797. {
2798.     const char *codec_string = encoder ? "encoder" : "decoder";
                                     ^
2799.     AVCodec *codec;
2800. 

ffmpeg.c:2798:5: 
2796. static enum CodecID find_codec_or_die(const char *name, int type, int encoder)
2797. {
2798.     const char *codec_string = encoder ? "encoder" : "decoder";
          ^
2799.     AVCodec *codec;
2800. 

ffmpeg.c:2801:9: Taking false branch
2799.     AVCodec *codec;
2800. 
2801.     if(!name)
              ^
2802.         return CODEC_ID_NONE;
2803.     codec = encoder ?

ffmpeg.c:2803:13: Condition is true
2801.     if(!name)
2802.         return CODEC_ID_NONE;
2803.     codec = encoder ?
                  ^
2804.         avcodec_find_encoder_by_name(name) :
2805.         avcodec_find_decoder_by_name(name);

ffmpeg.c:2803:5: 
2801.     if(!name)
2802.         return CODEC_ID_NONE;
2803.     codec = encoder ?
          ^
2804.         avcodec_find_encoder_by_name(name) :
2805.         avcodec_find_decoder_by_name(name);

ffmpeg.c:2806:9: Taking true branch
2804.         avcodec_find_encoder_by_name(name) :
2805.         avcodec_find_decoder_by_name(name);
2806.     if(!codec) {
              ^
2807.         fprintf(stderr, "Unknown %s '%s'\n", codec_string, name);
2808.         av_exit(1);

ffmpeg.c:2807:9: 
2805.         avcodec_find_decoder_by_name(name);
2806.     if(!codec) {
2807.         fprintf(stderr, "Unknown %s '%s'\n", codec_string, name);
              ^
2808.         av_exit(1);
2809.     }

ffmpeg.c:2808:9: Skipping av_exit(): empty list of specs
2806.     if(!codec) {
2807.         fprintf(stderr, "Unknown %s '%s'\n", codec_string, name);
2808.         av_exit(1);
              ^
2809.     }
2810.     if(codec->type != type) {

ffmpeg.c:2810:8: 
2808.         av_exit(1);
2809.     }
2810.     if(codec->type != type) {
             ^
2811.         fprintf(stderr, "Invalid %s type '%s'\n", codec_string, name);
2812.         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}']