ffprobe: Allow unknown format private AVOptions

This useful, because by ffprobe's very nature, you use it to probe
a file and find out what it is. Requiring every format private option
to be known to the demuxer forces one to run ffprobe twice, if one
wants to use ffprobe in a generic way.

For example, say one wants to probe all user-uploaded files, while
also ignoring edit lists for any MP4s that are uploaded. Currently,
you'd have to run ffprobe twice: once to identify the format, and
once again to actually probe the metadata you want. After this
patch, you could set -ignore_editlist 1 on every call and only
probe once.
Signed-off-by: NDerek Buitenhuis <derek.buitenhuis@gmail.com>

fftools/ffprobe.c

@@ -2854,7 +2854,7 @@ static int open_input_file(InputFile *ifile, const char *filename,
 {
     int err, i;
     AVFormatContext *fmt_ctx = NULL;
-    AVDictionaryEntry *t;
+    AVDictionaryEntry *t = NULL;
     int scan_all_pmts_set = 0;
 
     fmt_ctx = avformat_alloc_context();
@@ -2879,10 +2879,8 @@ static int open_input_file(InputFile *ifile, const char *filename,
     ifile->fmt_ctx = fmt_ctx;
     if (scan_all_pmts_set)
         av_dict_set(&format_opts, "scan_all_pmts", NULL, AV_DICT_MATCH_CASE);
-    if ((t = av_dict_get(format_opts, "", NULL, AV_DICT_IGNORE_SUFFIX))) {
-        av_log(NULL, AV_LOG_ERROR, "Option %s not found.\n", t->key);
-        return AVERROR_OPTION_NOT_FOUND;
-    }
+    while ((t = av_dict_get(format_opts, "", t, AV_DICT_IGNORE_SUFFIX)))
+        av_log(NULL, AV_LOG_WARNING, "Option %s skipped - not known to demuxer.\n", t->key);
 
     if (find_stream_info) {
         AVDictionary **opts = setup_find_stream_info_opts(fmt_ctx, codec_opts);