Fix index_entries pos:

It was being set wrong for files with data_offset > 0

Patch by Michael Chinen, mchinen gmail

Originally committed as revision 25239 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/avcodec.h

@@ -3738,6 +3738,8 @@ typedef struct AVCodecParserContext {
     int flags;
 #define PARSER_FLAG_COMPLETE_FRAMES           0x0001
 #define PARSER_FLAG_ONCE                      0x0002
+/// Set if the parser has a valid file offset
+#define PARSER_FLAG_FETCHED_OFFSET            0x0004
 
     int64_t offset;      ///< byte offset from starting packet start
     int64_t cur_frame_end[AV_PARSER_PTS_NB];

libavcodec/parser.c

@@ -150,6 +150,12 @@ int av_parser_parse2(AVCodecParserContext *s,
     int index, i;
     uint8_t dummy_buf[FF_INPUT_BUFFER_PADDING_SIZE];
 
+    if(!(s->flags & PARSER_FLAG_FETCHED_OFFSET)) {
+        s->next_frame_offset =
+        s->cur_offset        = pos;
+        s->flags |= PARSER_FLAG_FETCHED_OFFSET;
+    }
+
     if (buf_size == 0) {
         /* padding is always necessary even if EOF, so we add it here */
         memset(dummy_buf, 0, sizeof(dummy_buf));

libavformat/utils.c

@@ -1159,10 +1159,6 @@ static int av_read_frame_internal(AVFormatContext *s, AVPacket *pkt)
                 }else if(st->need_parsing == AVSTREAM_PARSE_FULL_ONCE){
                     st->parser->flags |= PARSER_FLAG_ONCE;
                 }
-                if(st->parser && (s->iformat->flags & AVFMT_GENERIC_INDEX)){
-                    st->parser->next_frame_offset=
-                    st->parser->cur_offset= st->cur_pkt.pos;
-                }
             }
         }
     }