Why disable socket timeout temporarily in FormatContext::findStreamInfo?

[ccsnake]

This will block in some cases.

thx

[h4tr3d]

@ccsnake , thanks for report. Could you please attach code via code tags in textual format?

1. It starts to be copyable.
2. It still to be colorized
3. It is simple to copy-paste code text.

According to your question, avformat_find_stream_info() for most header-less formats like MPEG-TS received via network requires a lot of time.

If you can provide a problematic source, that blocks in some cases call of the findStreamInfo(), I will debug it and provide a better solution.

[ccsnake]

thx for your reply.

Code location:

avcpp/src/formatcontext.cpp

Line 907 in fe8847a

ScopedValue<int64_t> scopedTimeoutDisable(m_socketTimeout, -1, m_socketTimeout);

My programe may blocked when i opened a local IPC stream(rtsp) which has bad network. In my case I will open and close stream with fixed interval .

[h4tr3d]

I analyse code. av_find_stream_info() is a complex function that some times requires so much time for internal work. FormatContext::setTimeout() useful for simple cases and mainly targeted for use with FormatContext::readPacket(). For complex cases you should use FormatContext::setInterruptCallback(). In such way, you can setup some flag, that your callback check and return 1 if findStreamInfo is timed out.

In any case, socketTimeout() is not a good choose for this option name... Maybe frameReadTimeout() is better.