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<div class="moz-cite-prefix">On 5/27/14 11:28 AM, wm4 wrote:<br>
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<blockquote cite="mid:20140527172814.70692965@debian" type="cite">
<pre wrap="">On Tue, 27 May 2014 17:10:55 +0530
sithruk sana <a class="moz-txt-link-rfc2396E" href="mailto:get2jils@gmail.com"><get2jils@gmail.com></a> wrote:
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<blockquote type="cite">
<pre wrap="">thanks for the reply.
I am doing the same by queueing the packet as described in dranger
tutorial <a class="moz-txt-link-freetext" href="http://dranger.com/ffmpeg/ffmpegtutorial_all.html">http://dranger.com/ffmpeg/ffmpegtutorial_all.html</a>
</pre>
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<pre wrap="">
This tutorial is prehistoric, and following it will cause you more pain
than not. Many things in it are just wrong or uses deprecated APIs. I
recommend pretending that this tutorial doesn't exist.
Normally, libavcodec decodes one frame for one packet. But you need
to deal with "codec delay": at first you won't get any decoded frames,
even if you put in some packets. Only later (when enough frames are
queued internally), you will get 1 decoded frame for 1 packet. (You also
need to feed it null-packets at the end of the video to get the last
frames.)</pre>
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If I have a buffer of encoded units, which I know contains a
complete frame of encoded input, are you saying that I may have to
pass multiple sets of these before I receive the decoded results of
the first buffer?<br>
<br>
Or are you saying that I can submit chunks of a frame's worth of
encoded input, and (understandably) won't get a complete frame back
until I pass in enough data for 1 frame?<br>
<br>
Does the term "packet" in your reply correspond to something
specific, as in, one "packet" of h264 encoded data corresponds to
one NALU, or do you mean, one "packet" refers to enough encoded
data, no matter the encoder, to make one frame?<br>
<br>
<blockquote cite="mid:20140527172814.70692965@debian" type="cite">
<pre wrap="">
There are others reasons why it wouldn't output a frame. If the video
frame is "damaged", you may need to set CODEC_FLAG2_SHOW_ALL or
CODEC_FLAG_OUTPUT_CORRUPT (forgot which one) to make lavc output them.
Also, it's possible to drop frames by setting skip_frame, but you
probably don't use this.
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this is useful, thank you<br>
<br>
Joshua Kordani<br>
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