avconv.c:2807: error: Null Dereference
  pointer `codec` last assigned on line 2800 could be null and is dereferenced at line 2807, column 8.

avconv.c:2795:1: start of procedure find_codec_or_die()
2793. }
2794. 
2795. static AVCodec *find_codec_or_die(const char *name, enum AVMediaType type, int encoder)
      ^
2796. {
2797.     const char *codec_string = encoder ? "encoder" : "decoder";

avconv.c:2797:32: Condition is true
2795. static AVCodec *find_codec_or_die(const char *name, enum AVMediaType type, int encoder)
2796. {
2797.     const char *codec_string = encoder ? "encoder" : "decoder";
                                     ^
2798.     AVCodec *codec;
2799. 

avconv.c:2797:5: 
2795. static AVCodec *find_codec_or_die(const char *name, enum AVMediaType type, int encoder)
2796. {
2797.     const char *codec_string = encoder ? "encoder" : "decoder";
          ^
2798.     AVCodec *codec;
2799. 

avconv.c:2800:13: Condition is true
2798.     AVCodec *codec;
2799. 
2800.     codec = encoder ?
                  ^
2801.         avcodec_find_encoder_by_name(name) :
2802.         avcodec_find_decoder_by_name(name);

avconv.c:2800:5: 
2798.     AVCodec *codec;
2799. 
2800.     codec = encoder ?
          ^
2801.         avcodec_find_encoder_by_name(name) :
2802.         avcodec_find_decoder_by_name(name);

avconv.c:2803:9: Taking true branch
2801.         avcodec_find_encoder_by_name(name) :
2802.         avcodec_find_decoder_by_name(name);
2803.     if(!codec) {
              ^
2804.         av_log(NULL, AV_LOG_FATAL, "Unknown %s '%s'\n", codec_string, name);
2805.         exit_program(1);

avconv.c:2804:9: Skipping av_log(): empty list of specs
2802.         avcodec_find_decoder_by_name(name);
2803.     if(!codec) {
2804.         av_log(NULL, AV_LOG_FATAL, "Unknown %s '%s'\n", codec_string, name);
              ^
2805.         exit_program(1);
2806.     }

avconv.c:2805:9: Skipping exit_program(): empty list of specs
2803.     if(!codec) {
2804.         av_log(NULL, AV_LOG_FATAL, "Unknown %s '%s'\n", codec_string, name);
2805.         exit_program(1);
              ^
2806.     }
2807.     if(codec->type != type) {

avconv.c:2807:8: 
2805.         exit_program(1);
2806.     }
2807.     if(codec->type != type) {
             ^
2808.         av_log(NULL, AV_LOG_FATAL, "Invalid %s type '%s'\n", codec_string, name);
2809.         exit_program(1);

static AVCodec *find_codec_or_die(const char *name, enum AVMediaType type, int encoder)
{
    const char *codec_string = encoder ? "encoder" : "decoder";
    AVCodec *codec;
    codec = encoder ?
        avcodec_find_encoder_by_name(name) :
        avcodec_find_decoder_by_name(name);
    if(!codec) {
        av_log(NULL, AV_LOG_FATAL, "Unknown %s '%s'\n", codec_string, name);
        exit_program(1);
    }
    if(codec->type != type) {
        av_log(NULL, AV_LOG_FATAL, "Invalid %s type '%s'\n", codec_string, name);
        exit_program(1);
    }
    return codec;
}
['static AVCodec *find_codec_or_die(const char *name, enum AVMediaType type, int encoder)\n{\n    const char *codec_string = encoder ? "encoder" : "decoder";\n    AVCodec *codec;\n    codec = encoder ?\n        avcodec_find_encoder_by_name(name) :\n        avcodec_find_decoder_by_name(name);\n    if(!codec) {\n        av_log(NULL, AV_LOG_FATAL, "Unknown %s \'%s\'\\n", codec_string, name);\n        exit_program(1);\n    }\n    if(codec->type != type) {\n        av_log(NULL, AV_LOG_FATAL, "Invalid %s type \'%s\'\\n", codec_string, name);\n        exit_program(1);\n    }\n    return codec;\n}']