<div dir="ltr">I'm trying to handle video errors in advance to avoid encoding broken files, to do it I want to decode the whole file and report if there are errors (ffmpeg 3.4.x).<div><br></div><div>I use the "new" ffmpeg APIs, so my loop is basically <br clear="all"><div><br></div><div>while av_read_frame(input) > 0 {</div><div> if (index == video) { </div><div> avcodec_send_packet() -> check error</div><div> avcodec_receive_frame() -> check error</div><div> }</div><div>}</div><div><br></div><div>the problem is that also if there are errors, for instance in one of my samples:</div><div><br></div><div><div>[h264 @ 0x7fe8a1804400] error while decoding MB 100 67, bytestream -5</div><div>[h264 @ 0x7fe8a1804400] concealing 69 DC, 69 AC, 69 MV errors in P frame</div></div><div><br></div><div>.. in another one...</div><div><br></div><div><div>[h264 @ 0x7fe8a1803800] error while decoding MB 110 67, bytestream -12</div><div>[h264 @ 0x7fe8a1803800] concealing 59 DC, 59 AC, 59 MV errors in P frame</div></div><div><br></div><div>... no API returns me the error (except some EGAIN in the first receive_frame() that must be ignored)<br></div><div><br></div><div>I've tried also to set videocontext.error_concealement = 0 without differences, I see in the video context also an undocumented err_recognition that I do not know how to use, the headers just say:</div><div><br></div><div><div>/**</div><div> * Error recognition; may misdetect some more or less valid parts as errors.</div><div> * - encoding: unused</div><div> * - decoding: Set by user.</div><div> */</div><div> int err_recognition;</div></div><div><br></div><div>I tried to set it to 0xfffffffff and I got my first error in avcodec_send_packet, but I don't know if I made the right thing! :)</div><div><br></div><div>I remember older version of the API had error_resilience in the context that could be used to stop decoding if something went wrong, I can also find traces of it in the internet, but not in ffmpeg headers:</div><div><br></div><div><span style="color:rgb(20,20,20);font-family:"Lucida Grande","Trebuchet MS",Verdana,Helvetica,Arial,sans-serif;background-color:rgb(244,244,244);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">FF_ER_CAREFUL</span><br style="color:rgb(20,20,20);font-family:"Lucida Grande","Trebuchet MS",Verdana,Helvetica,Arial,sans-serif;background-color:rgb(244,244,244);text-decoration-style:initial;text-decoration-color:initial"><span style="color:rgb(20,20,20);font-family:"Lucida Grande","Trebuchet MS",Verdana,Helvetica,Arial,sans-serif;background-color:rgb(244,244,244);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">FF_ER_COMPLIANT<span> </span></span><br style="color:rgb(20,20,20);font-family:"Lucida Grande","Trebuchet MS",Verdana,Helvetica,Arial,sans-serif;background-color:rgb(244,244,244);text-decoration-style:initial;text-decoration-color:initial"><span style="color:rgb(20,20,20);font-family:"Lucida Grande","Trebuchet MS",Verdana,Helvetica,Arial,sans-serif;background-color:rgb(244,244,244);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">FF_ER_AGGRESSIVE<span> </span></span><br style="color:rgb(20,20,20);font-family:"Lucida Grande","Trebuchet MS",Verdana,Helvetica,Arial,sans-serif;background-color:rgb(244,244,244);text-decoration-style:initial;text-decoration-color:initial"><span style="color:rgb(20,20,20);font-family:"Lucida Grande","Trebuchet MS",Verdana,Helvetica,Arial,sans-serif;background-color:rgb(244,244,244);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">FF_ER_VERY_AGGRESSIVE<span> </span></span><br></div><div><br></div><div>... any hints on err_recognition (if it's the right thing to set and the correct values to use)?</div><div><br></div>-- <div><b>Bye,</b><div class="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><font size="2"><b>Gabry</b><br></font><br></div></div></div></div>
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