#9670: RTP with custom IO hangs on av_read_frame
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Reporter: kevmo314 | Type: defect
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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If I construct an avio alloc context for RTP packets with
avio_alloc_context(buf, 1500, 0, NULL, read_func, NULL, NULL)
ie, not setting write_flag, that read_packet in rtsp.c will hang,
specifically these two lines:
https://github.com/FFmpeg/FFmpeg/blob/master/libavformat/rtsp.c#L2183-L2184
The custom IO attempts to write a receiver report and infinite-loops when
calling avio_write().
I think to fix this, this line:
if (len > 0 && (*rtsp_st)->transport_priv && rt->transport ==
RTSP_TRANSPORT_RTP)
should also check the write_flag:
if (len > 0 && (*rtsp_st)->transport_priv && rt->transport ==
RTSP_TRANSPORT_RTP && s->pb->write_flag)
because currently it seems to assume that RTCP packets can be written,
which is not necessarily true with custom IO.
I can provide a more detailed reproduction script if necessary, but given
the relatively simple fix I'm hoping the above information is sufficient.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/9670>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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