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<div class="moz-cite-prefix">On 4/10/2017 4:37 PM, YIRAN LI wrote:<br>
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<div class="gmail_quote">2017-04-10 7:16 GMT+10:00 bowljoman <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:bowljoman@gmail.com" target="_blank">bowljoman@gmail.com</a>></span>:<br>
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<div>sorry if this client top posts, but to answer, you
can do 1 of 2 things. assume it is different and
insert it before returning to the unprocessed clip. or
you can check if they are different by doing a
comparison.</div>
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<div class="gmail_default" style="font-family:georgia,serif">Thanks
for your suggestion. Let's say if original H.264 video
stream has AVCC bitstream, no matter you encode 1st part
with Annex-b or AVCC, as long as it's different from
orginal format, I won't be able to do codec copy using
readpacket/writepacket, right?</div>
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<div class="gmail_default" style="font-family:georgia,serif">Thanks</div>
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<div style="font-size:85%;color:#575757" dir="auto">Sent
from my T-Mobile 4G LTE Device</div>
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<div>-------- Original message --------</div>
<div>From: YIRAN LI <<a moz-do-not-send="true"
href="mailto:mrfun.china@gmail.com"
target="_blank">mrfun.china@gmail.com</a>> </div>
<div>Date: 4/7/17 3:15 PM (GMT-08:00) </div>
<div>To: "This list is about using libavcodec,
libavformat, libavutil, libavdevice and
libavfilter." <<a moz-do-not-send="true"
href="mailto:libav-user@ffmpeg.org"
target="_blank">libav-user@ffmpeg.org</a>>,
FFmpeg user questions <<a
moz-do-not-send="true"
href="mailto:ffmpeg-user@ffmpeg.org"
target="_blank">ffmpeg-user@ffmpeg.org</a>> </div>
<div>Subject: [Libav-user] re-encoding and transcode
(codec copy) on same file. </div>
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<div style="font-family:georgia,serif">Hi guys,</div>
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<div style="font-family:georgia,serif">I'm
investigating if it's possible to do editing and
transcode on same file.</div>
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<div style="font-family:georgia,serif">I mean use
-vcodec copy, we can readout packets and write
them directly into output file without
re-encoding. But if it's possible, for example if
I have a 2 mins video, re-encode 1st min because
there're some effects applied to that region but
copy 2nd part?</div>
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<div style="font-family:georgia,serif">My concern
is, for example we know H.264 has extradata, if I
re-encode first part but keep 2nd part, how if new
extradata is different from old extradta?</div>
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<div style="font-family:georgia,serif">Anyone have
suggestion on this? and any other possible
problems doing this?</div>
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<div style="font-family:georgia,serif">Thanks</div>
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<p>It doesnt matter what the inputs are. just convert them to one or
the other type. the final stream can be assembled with all avc or
avcc packets. choose one or the other.<br>
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