Jun Zhao 8d80b13cbe
doc/examples/remux: fix NULL pointer dereference in cleanup ...
The cleanup path uses `ofmt->flags` to check AVFMT_NOFILE, but
`ofmt` is only assigned after avformat_alloc_output_context2
succeeds. If a failure occurs between output context allocation
and the `ofmt` assignment (e.g. stream_mapping allocation fails),
ofmt_ctx is non-NULL while ofmt is still NULL, causing a crash.
Use ofmt_ctx->oformat->flags instead, which is always valid when
ofmt_ctx is non-NULL.
Signed-off-by: Jun Zhao <barryjzhao@tencent.com >
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8d80b13cbe