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doc/examples/decode_video: add input file format information for usage 

Signed-off-by: Steven Liu <lq@chinaffmpeg.org>
This commit is contained in:
Steven Liu 2019-08-21 19:34:49 +08:00
parent 7c2ff06b6e
commit 6d1009cb9d
1 changed files with 2 additions and 1 deletions
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doc/examples/decode_video.c
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@ -95,7 +95,8 @@ int main(int argc, char **argv)
AVPacket *pkt;
if (argc <= 2) {
fprintf(stderr, "Usage: %s <input file> <output file>\n", argv[0]);
fprintf(stderr, "Usage: %s <input file> <output file>\n"
"And check your input file is encoded by mpeg1video please.\n", argv[0]);
exit(0);
}
filename = argv[1];