add create folder question

fftools/ffmpeg_opt.c

@@ -21,6 +21,10 @@
 
 #include <stdint.h>
 
+//mkdir
+#include <sys/stat.h>
+#include <sys/types.h>
+
 #include "ffmpeg.h"
 #include "cmdutils.h"
 
@@ -2133,6 +2137,39 @@ static int init_complex_filters(void)
     return 0;
 }
 
+
+//creates a Folder and if not existing all parent dirs returns 0 on success and -1 on errror
+//this function always tries to create the parent of the named file
+static int createFolder(char* file) {
+//get parent folder
+    //search for last /
+    char* lastslash;
+    for(char* fnameit = file; *fnameit; ++fnameit) {
+        if((*fnameit) == '/') {
+            lastslash = fnameit;
+        }
+    }
+
+    //copy path to new buffer
+    int lenparent = lastslash-file;
+    char* parent = malloc((lenparent +1) * sizeof(char));
+    memcpy(parent, file, lenparent);
+    parent[lenparent] = '\0';
+
+    //printf("Try to create folder: %s\n", parent);
+
+    //try to create
+    if(mkdir(parent, 0755)) {
+        //error
+        //try to create parent
+        if(createFolder(parent) == 0) {
+            return mkdir(parent, 0755); //try again
+        }
+        return -1; //error
+    }
+    return 0; //success
+}
+
 static int open_output_file(OptionsContext *o, const char *filename)
 {
     AVFormatContext *oc;
@@ -2586,8 +2623,29 @@ loop_end:
         if ((err = avio_open2(&oc->pb, filename, AVIO_FLAG_WRITE,
                               &oc->interrupt_callback,
                               &of->opts)) < 0) {
-            print_error(filename, err);
-            exit_program(1);
+                
+            if(err == -ENOENT) {
+                //file does not exists
+               av_log(NULL, AV_LOG_WARNING, "%s: does not exists - create parent folder and try again [N/y]?", filename);
+                char c = getchar();
+                printf("\n");
+                if(c == 'y' || c == 'Y') {
+                    if(createFolder(filename) == -1) {
+                        av_log(NULL, AV_LOG_ERROR, "Could not create Directories\n");
+                        exit_program(1);
+                    }
+                    //try to init stream again
+                    if ((err = avio_open2(&oc->pb, filename, AVIO_FLAG_WRITE,
+                              &oc->interrupt_callback,
+                              &of->opts)) < 0) {
+                        print_error(filename, err);
+                        exit_program(1);
+                    }
+                } else {
+                    print_error(filename, err);
+                    exit_program(1);
+                }
+            }
         }
     } else if (strcmp(oc->oformat->name, "image2")==0 && !av_filename_number_test(filename))
         assert_file_overwrite(filename);