WMV Converter Fails FFMpeg - objective-c

Question

I just cann't seem to get the FFMpeg working with using the library. Everytime I try to convert asf file to wmv. I get the following issue on run time:
[wmv1 # 0x81ee000]error, slice code was 2
[wmv1 # 0x81ee000]header damaged
This my code:
static void audio_decode_example(const char *outfilename, const char *filename)
{
AVCodec *codec;
AVCodecContext *c= NULL;
int out_size, len, in_size;
FILE *f, *outfile;
uint8_t *outbuf;
uint8_t inbuf[AUDIO_INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
AVPacket avpkt;
av_init_packet(&avpkt);
printf("Audio decoding\n");
/* find the mpeg audio decoder */
codec = avcodec_find_decoder(CODEC_ID_WMV1);
if (!codec) {
fprintf(stderr, "codec not found\n");
return;
}
c= avcodec_alloc_context2(CODEC_TYPE_AUDIO);
/* open it */
if (avcodec_open(c, codec) < 0) {
fprintf(stderr, "could not open codec\n");
return;
}
outbuf = malloc(AVCODEC_MAX_AUDIO_FRAME_SIZE);
f = fopen(filename, "rb");
if (!f) {
fprintf(stderr, "could not open %s\n", filename);
return;
}
outfile = fopen(outfilename, "wb");
if (!outfile) {
av_free(c);
return;
}
/* decode until eof */
avpkt.data = inbuf;
len = avpkt.size = fread(inbuf, 1, INBUF_SIZE, f);
NSLog(#"%d", avpkt.size);
while (avpkt.size > 0) {
out_size = AVCODEC_MAX_AUDIO_FRAME_SIZE;
len = avcodec_decode_audio2(c, (short *)outbuf, &out_size, inbuf,len);// avpkt.size);
NSLog(#"%d", len);
if (len < 0) {
fprintf(stderr, "Error while decoding\n");
fclose(outfile);
return;
}
if (out_size > 0) {
/* if a frame has been decoded, output it */
fwrite(outbuf, 1, out_size, outfile);
}
avpkt.size -= len;
avpkt.data += len;
if (avpkt.size < AUDIO_REFILL_THRESH) {
/* Refill the input buffer, to avoid trying to decode
* incomplete frames. Instead of this, one could also use
* a parser, or use a proper container format through
* libavformat. */
memmove(inbuf, avpkt.data, avpkt.size);
avpkt.data = inbuf;
len = fread(avpkt.data + avpkt.size, 1,
INBUF_SIZE - avpkt.size, f);
if (len > 0)
avpkt.size += len;
}
}
fclose(outfile);
fclose(f);
free(outbuf);
avcodec_close(c);
av_free(c);
}
I have try the command line utilities and it successfully convert the file. Any help would be helpfully. thanks

Answer 1

Make the mistake of opening the wrong file