avconv.c:2822: error: Null Dereference
  pointer `codec` last assigned on line 2815 could be null and is dereferenced at line 2822, column 8.

avconv.c:2808:1: start of procedure find_codec_or_die()
2806. }
2807. 
2808. static enum CodecID find_codec_or_die(const char *name, enum AVMediaType type, int encoder)
      ^
2809. {
2810.     const char *codec_string = encoder ? "encoder" : "decoder";

avconv.c:2810:32: Condition is true
2808. static enum CodecID find_codec_or_die(const char *name, enum AVMediaType type, int encoder)
2809. {
2810.     const char *codec_string = encoder ? "encoder" : "decoder";
                                     ^
2811.     AVCodec *codec;
2812. 

avconv.c:2810:5: 
2808. static enum CodecID find_codec_or_die(const char *name, enum AVMediaType type, int encoder)
2809. {
2810.     const char *codec_string = encoder ? "encoder" : "decoder";
          ^
2811.     AVCodec *codec;
2812. 

avconv.c:2813:9: Taking false branch
2811.     AVCodec *codec;
2812. 
2813.     if(!name)
              ^
2814.         return CODEC_ID_NONE;
2815.     codec = encoder ?

avconv.c:2815:13: Condition is true
2813.     if(!name)
2814.         return CODEC_ID_NONE;
2815.     codec = encoder ?
                  ^
2816.         avcodec_find_encoder_by_name(name) :
2817.         avcodec_find_decoder_by_name(name);

avconv.c:2815:5: 
2813.     if(!name)
2814.         return CODEC_ID_NONE;
2815.     codec = encoder ?
          ^
2816.         avcodec_find_encoder_by_name(name) :
2817.         avcodec_find_decoder_by_name(name);

avconv.c:2818:9: Taking true branch
2816.         avcodec_find_encoder_by_name(name) :
2817.         avcodec_find_decoder_by_name(name);
2818.     if(!codec) {
              ^
2819.         av_log(NULL, AV_LOG_ERROR, "Unknown %s '%s'\n", codec_string, name);
2820.         exit_program(1);

avconv.c:2819:9: Skipping av_log(): empty list of specs
2817.         avcodec_find_decoder_by_name(name);
2818.     if(!codec) {
2819.         av_log(NULL, AV_LOG_ERROR, "Unknown %s '%s'\n", codec_string, name);
              ^
2820.         exit_program(1);
2821.     }

avconv.c:2820:9: Skipping exit_program(): empty list of specs
2818.     if(!codec) {
2819.         av_log(NULL, AV_LOG_ERROR, "Unknown %s '%s'\n", codec_string, name);
2820.         exit_program(1);
              ^
2821.     }
2822.     if(codec->type != type) {

avconv.c:2822:8: 
2820.         exit_program(1);
2821.     }
2822.     if(codec->type != type) {
             ^
2823.         av_log(NULL, AV_LOG_ERROR, "Invalid %s type '%s'\n", codec_string, name);
2824.         exit_program(1);

static enum CodecID find_codec_or_die(const char *name, enum AVMediaType 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) {
        av_log(NULL, AV_LOG_ERROR, "Unknown %s '%s'\n", codec_string, name);
        exit_program(1);
    }
    if(codec->type != type) {
        av_log(NULL, AV_LOG_ERROR, "Invalid %s type '%s'\n", codec_string, name);
        exit_program(1);
    }
    return codec->id;
}
['static enum CodecID 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    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        av_log(NULL, AV_LOG_ERROR, "Unknown %s \'%s\'\\n", codec_string, name);\n        exit_program(1);\n    }\n    if(codec->type != type) {\n        av_log(NULL, AV_LOG_ERROR, "Invalid %s type \'%s\'\\n", codec_string, name);\n        exit_program(1);\n    }\n    return codec->id;\n}']