A test version of my mp4 command line tagger is available at:

Source:  http://users.rcn.com/rpritz/tgsrc809.zip
Windows exe: http://users.rcn.com/rpritz/tg809.zip

This is still in development. Use at your own risk.  Any comments welcome.

#include <stdio.h>

#include <mp4.h>

int main(int argc, char *argv[])
{
  char *album;
  MP4FileHandle f;

  if (argc < 3) {
    fprintf(stderr, "Usage: %s <song> <album>\n", argv[0]);
    return -1;
  }
    
  f = MP4Modify(argv[1], 0, 1);

  if (argc < 3) {
    fprintf(stderr, "Unable to open MP4 file %s\n", argv[1]);
    return -1;
  }

#if 1
  if (MP4GetMetadataAlbum(f, &album)) {
    printf("album: %s\n", album);
    free(album);
  }
#endif
  
  if (!MP4SetMetadataAlbum(f, argv[2]))
    printf("failed to set album\n", album);

#if 1
  if (MP4GetMetadataAlbum(f, &album)) {
    printf("album: %s\n", album);
    free(album);
  }
#endif

#if 1
  MP4Close(f);
#endif

  return 0;
}

Because you opened the file with read-only acess

s/f = MP4Read(song, 0);/f = MP4Modify(song, 0, 0);/

f = MP4Modify(argv[1], 0, 1);

if (argc < 3) {
  fprintf(stderr, "Unable to open MP4 file %s\n", argv[1]);
  return -1;
}

any chance of a gui/frontend...?

(  i know..)

Is there any documentation for ths, other than the source code? 

There's very complete documentation in the mpeg4ip package:

/mpeg4ip/docs/mp4v2/

Menno

Quote

There's very complete documentation in the mpeg4ip package:

/mpeg4ip/docs/mp4v2/

Menno

I see documentation for Read and Modify, but none for the Metadata functions. 

Please either point me to the docs I'm not finding or post an example of modifying metadata.

I noticed your name at the top of two of the meta source files. They're very nicely written, btw. 

>>I noticed recently that with latest versions of the mp4v2 library it is not possible to read from a MP4 files when opened with MP4Modify(). So reading should only be done when the file is opened with MP4Read().>>

That's why we should have docs for the get/set metadata functions beyond the source code  :-)

Also, I can't get Setmeta to work. Specifically, after running setmeta, the mp4 becomes unreadable with an invalid atom size error.  Please post a minimal program with a working example.

Please post source code showing how to use setmeta.

#include <stdio.h>

#include <mp4.h>


int main(int argc, char *argv[])
{
  if (argc == 2) {
    MP4FileHandle f = MP4Read(argv[1], 0);
    char *album;

    if (!f) {
      fprintf(stderr, "Unable to open MP4 file %s\n", argv[1]);
      return -1;
    }

    if (MP4GetMetadataAlbum(f, &album)) {
      printf("album: %s\n", album);
      free(album);
    }

    if(!MP4Close(f))
      printf("failed to close MP4 file\n");

  } else if (argc == 3) {
    MP4FileHandle f = MP4Modify(argv[1], 0, 0);

    if (!f) {
      fprintf(stderr, "Unable to open MP4 file %s\n", argv[1]);
      return -1;
    }
    
    MP4MetadataDelete(f);
    
    if (!MP4SetMetadataAlbum(f, argv[2]))
      printf("failed to set album\n");
    
    if(!MP4Close(f))
      printf("failed to close MP4 file\n");

  } else {
    fprintf(stderr, "Usage: %s <song> [album]\n", argv[0]);
    return -1;
  }

  MP4Optimize(argv[1], NULL, 0);
  
  return 0;
}

Newer version of source is source
Windows exe at exe

Have you tried the new EphPod beta?   http://www.builderadius.com/ephpod/ephpod272.zip

It didn't crash or exhibit any odd behavior.  Similar result with using Générique on all other parmeters.  I'm not sure why you're having a problem.  Please provide more information.

Why don't you add another parameter for the total tracks in the album? Right now your code sets this to be the same as the track number.