Error handling

[mloehnig]

Hello, I just started to use this package and I stumbled across some interesting behavior, I noticed that whenever a syscall.EAGAIN is received no error is returned and potentially a nil value is also returned. Example 1 Example 2

Typically in Go you would propagate an error like this to allow the application layer to be able to change behavior.

Is there a particular reason for not propagating the error?

[3d0c]

Here is a comment from decode.h of libavcodec

/**
 * Called by decoders to get the next packet for decoding.
 *
 * @param pkt An empty packet to be filled with data.
 * @return 0 if a new reference has been successfully written to pkt
 *         AVERROR(EAGAIN) if no data is currently available
 *         AVERROR_EOF if and end of stream has been reached, so no more data
 *                     will be available
 */

This is why.

[mloehnig]

Yes I understand the comment. The issue I am having is these two errors are being masked/not returned or propagated. If the error EAGAIN, error i am receiving, is received my application code should retry again but since I never received the error I have no way of making a smart application level decision. I would happily make a PR to allow for these values to be propagated if you agree they should be.

[3d0c]

Feel free to contribute, would be great to have another one Decode function, let's name it Decode2 for backward compatibility