compiling with fixed options ?

[netlink1987]

Hi all,

I would like to compile ffmpeg with fixed arguments, ie: ffmpeg -i rtsp://localhost/live -vcodec copy -acodec copy -f flv rtmp://remotehost/live

I can't for security reasons call it from an external script, this must be included in the ffmpeg binary. Prblem is that the source codes are very big , so do u know a simple way to do that ?

Tx

[Selur]

so do u know a simple way to do that ?

overwrite "argc" and "argv" with the values you want at the beginning of the main in fftools/ffmpeg.c seems simple

[netlink1987]

hi,

thanks for reply,

I will do this.

[netlink1987]

i 've tried this, but the programm does not start with these fixed arguments (i do not have enough knowledges in C):

int main(int argc, char **argv)
{

argv=malloc(10 * sizeof(char *));
argv[1] =(char *) malloc( strlen("-i " ) + 1 );
strcpy(argv[1],"-i " );
argv[2] =(char *) malloc( strlen("rtsp://192.168.1.38/live " ) + 1 );
strcpy(argv[2],"rtsp://192.168.1.38/axis-media/media.amp " );
argv[3] =(char *) malloc( strlen("-vcodec " ) + 1 );
strcpy(argv[3],"-vcodec " );
argv[4] =(char *) malloc( strlen("copy " ) + 1 );
strcpy(argv[4],"copy " );
argv[5] =(char *) malloc( strlen("-acodec " ) + 1 );
strcpy(argv[5],"-acodec " );
argv[6] =(char *) malloc( strlen("copy " ) + 1 );
strcpy(argv[6],"copy " );
argv[7] =(char *) malloc( strlen("-f " ) + 1 );
strcpy(argv[7],"-f " );
argv[8] =(char *) malloc( strlen("flv " ) + 1 );
strcpy(argv[8],"flv " );
argv[9] =(char *) malloc( strlen("rtmp://192.168.1.114/live " ) + 1 );
strcpy(argv[9],"rtmp://192.168.1.114/hls/axis " );
printf("argument %s\n", argv[1]);
printf("argument %s\n", argv[2]);
printf("argument %s\n", argv[3]);
printf("argument %s\n", argv[4]);
printf("argument %s\n", argv[5]);
printf("argument %s\n", argv[6]);
printf("argument %s\n", argv[7]);
printf("argument %s\n", argv[8]);
printf("argument %s\n", argv[9]);

argv[10]=NULL;
/*for (i=0; i < 9; i++)*/
free(argv);
return 0;
}

[sophisticles]

argv[2] =(char *) malloc( strlen("rtsp://192.168.1.38/live " ) + 1 );

argv[9] =(char *) malloc( strlen("rtmp://192.168.1.114/live " ) + 1 );

^^^This is never going to work, malloc is used to allocate memory, and in this case is being used with strlen which gets the length of a string argument, that argument can either be a variable or a constant. Your modification is a variable but you haven't defined the variable anywhere, in other words you are attempting to treat an undefined variable as a constant.

I won't even begin to dissect everything else wrong with your approach.

As for Selur's "overwrite "argc" and "argv" with the values you want at the beginning of the main in fftools/ffmpeg.c seems simple", I would take anything he tells you about programming with some salt, and possibly some pepper also; if you have ever used that buggy mess of a program he created, Hybrid, you would know that he is not the bastion of competent programming.

[Selur]

@netlink1987: haven't written C code for ages, but I guess it should be something more like:

char* name = argv[0]; // grab first argument from original argv
// overwrite existing 
*argv[] = {
  name, // 0
  '-i', // 1
  'rtsp://192.168.1.38/axis-media/media.am', //2
  '-vcodec', // 3
  'copy', // 4
  '-acodec', //5
  'copy', // 6
  '-f', // 7
  'flv', //8
  'rtmp://192.168.1.114/hls/axis', // 9
};
argc = 10; // argument count

the main function in ffmpeg,c starts with:

int main(int argc, char **argv)
{
    int i, ret;
    BenchmarkTimeStamps ti;

    init_dynload();

inserting the above code between 'BenchmarkTimeStamps ti;' and 'init_dynload();' should overwrite arc and argv.

@sophiscticles: my condolences, being you must suck

[Selur]

Here's a correction to C / C++11 syntax (not sure which ffmpeg uses atm.)

argc = 10; // argument count
argv = new char *[argc];
argv[0] = name;
argv[1] = "-i";
argv[2] = "rtsp://192.168.1.38/axis-media/media.am";
argv[3] = "-vcodec";
argv[4] = "copy";
argv[5] = "-acodec";
argv[6] = "copy";
argv[7] = "-f";
argv[8] = "flv";
argv[9] = "rtmp://192.168.1.114/hls/axis";

in case ffmpeg does use c++11, you will have to use something like:

char* name = argv[0]; // grab first argument from original argv
  // overwrite existing
  argc = 10; // argument count
  argv = new char *[argc];
  argv[0] = name;
  char tmp1[] = "-i";
  strcpy_s(tmp1, argv[1]);
  char tmp2[] = "rtsp://192.168.1.38/axis-media/media.am";
  strcpy_s(tmp2, argv[2]);
  char tmp3[] = "-vcodec";
  strcpy_s(tmp3, argv[3]);
  char tmp4[] = "copy";
  strcpy_s(tmp4, argv[4]);
  char tmp5[] = "-acodec";
  strcpy_s(tmp5, argv[5]);
  char tmp6[] = "copy";
  strcpy_s(tmp6, argv[6]);
  char tmp7[] = "-f";
  strcpy_s(tmp7, argv[7]);
  char tmp8[] = "flv";
  strcpy_s(tmp8, argv[8]);
  char tmp9[] = "rtmp://192.168.1.114/hls/axis";
  strcpy_s(tmp9, argv[9]);

Cu Selur