Fixes: signed integer overflow: 24709512 * 88 cannot be represented in type 
'int'
Fixes: 
50993/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-6737973728641024

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavformat/rpl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/rpl.c b/libavformat/rpl.c
index d025589bfc3..3ef6fda3862 100644
--- a/libavformat/rpl.c
+++ b/libavformat/rpl.c
@@ -279,7 +279,7 @@ static int rpl_read_header(AVFormatContext *s)
     error |= read_line(pb, line, sizeof(line));  // size of "helpful" sprite
     if (vst) {
         error |= read_line(pb, line, sizeof(line));  // offset to key frame 
list
-        vst->duration = number_of_chunks * rpl->frames_per_chunk;
+        vst->duration = number_of_chunks * (int64_t)rpl->frames_per_chunk;
     }
 
     // Read the index
-- 
2.17.1

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