avconv.c:2875: error: Null Dereference
  pointer `codec` last assigned on line 2868 could be null and is dereferenced at line 2875, column 8.

avconv.c:2863:1: start of procedure find_codec_or_die()
2861. }
2862. 
2863. static AVCodec *find_codec_or_die(const char *name, enum AVMediaType type, int encoder)
      ^
2864. {
2865.     const char *codec_string = encoder ? "encoder" : "decoder";

avconv.c:2865:32: Condition is true
2863. static AVCodec *find_codec_or_die(const char *name, enum AVMediaType type, int encoder)
2864. {
2865.     const char *codec_string = encoder ? "encoder" : "decoder";
                                     ^
2866.     AVCodec *codec;
2867. 

avconv.c:2865:5: 
2863. static AVCodec *find_codec_or_die(const char *name, enum AVMediaType type, int encoder)
2864. {
2865.     const char *codec_string = encoder ? "encoder" : "decoder";
          ^
2866.     AVCodec *codec;
2867. 

avconv.c:2868:13: Condition is true
2866.     AVCodec *codec;
2867. 
2868.     codec = encoder ?
                  ^
2869.         avcodec_find_encoder_by_name(name) :
2870.         avcodec_find_decoder_by_name(name);

avconv.c:2868:5: 
2866.     AVCodec *codec;
2867. 
2868.     codec = encoder ?
          ^
2869.         avcodec_find_encoder_by_name(name) :
2870.         avcodec_find_decoder_by_name(name);

avconv.c:2871:9: Taking true branch
2869.         avcodec_find_encoder_by_name(name) :
2870.         avcodec_find_decoder_by_name(name);
2871.     if(!codec) {
              ^
2872.         av_log(NULL, AV_LOG_FATAL, "Unknown %s '%s'\n", codec_string, name);
2873.         exit_program(1);

avconv.c:2872:9: Skipping av_log(): empty list of specs
2870.         avcodec_find_decoder_by_name(name);
2871.     if(!codec) {
2872.         av_log(NULL, AV_LOG_FATAL, "Unknown %s '%s'\n", codec_string, name);
              ^
2873.         exit_program(1);
2874.     }

avconv.c:2873:9: Skipping exit_program(): empty list of specs
2871.     if(!codec) {
2872.         av_log(NULL, AV_LOG_FATAL, "Unknown %s '%s'\n", codec_string, name);
2873.         exit_program(1);
              ^
2874.     }
2875.     if(codec->type != type) {

avconv.c:2875:8: 
2873.         exit_program(1);
2874.     }
2875.     if(codec->type != type) {
             ^
2876.         av_log(NULL, AV_LOG_FATAL, "Invalid %s type '%s'\n", codec_string, name);
2877.         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}']