[Bug 792664] souphttpsrc: Should send "Range" when offset is 0

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=792664

--- Comment #5 from Paul Kim <paul.hyunil at lge.com> ---
Seek function is not working with LGE TVs because when "Range" field is not
included in request header, "freevideo served by mod_h264_streaming" file
header is transferred from serverside. However, when "Range" filed is included,
"freevideo served by mod_h264_streaming" is not included in the mp4 file. Thus,
the decoder can`t decode normally. 
The relevent code of ffmpeg is found
https://github.com/FFmpeg/FFmpeg/blob/cbbb2067341d7c2d98f560f81c6fb103af33a490/libavformat/http.c 

 // Note: we send this on purpose even when s->off is 0 when we're probing,
 // since it allows us to detect more reliably if a (non-conforming)
 // server supports seeking by analysing the reply headers.
    if (!has_header(s->headers, "\r\nRange: ") && !post && (s->off > 0 ||
s->end_off || s->seekable == -1)) {
        len += av_strlcatf(headers + len, sizeof(headers) - len,
                           "Range: bytes=%"PRIu64"-", s->off);
        if (s->end_off)
            len += av_strlcatf(headers + len, sizeof(headers) - len,
                               "%"PRId64, s->end_off - 1);
        len += av_strlcpy(headers + len, "\r\n",
                          sizeof(headers) - len);
    }

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