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<div class="moz-cite-prefix">El 31/07/18 a las 04:16, ganesh mundhe
escribió:<br>
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cite="mid:CAPcJ43bEYL3c+T4EMOUdT_9-q3afEq7cZ4xpF7OQEJU3jJxmAA@mail.gmail.com">
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<div dir="ltr">Hello all,<br>
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<p class="MsoNormal">I have been trying to decode
videos where I need to offset start position.</p>
<p class="MsoNormal">I have tried to use AV_seek_frame
but it works on raw video format (.y4m) but fails on
mpeg2 compressed formats.
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<p class="MsoNormal">Generally videos are in mp4 or
wmv and I need to write for those directly instead
of converting them into .y4m</p>
<p class="MsoNormal">Here how I’m using it </p>
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style="margin-left:2.75pt;border-collapse:collapse"
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<td style="width:613.75pt;border:solid
windowtext 1.0pt;padding:0in 5.4pt 0in
5.4pt;height:136.5pt" valign="top" width="703">
<p class="MsoNormal"><span
style="font-size:9.5pt;font-family:Consolas;color:blue">int</span><span
style="font-size:9.5pt;font-family:Consolas;color:black"> frmaeno = 100;</span></p>
<p class="MsoNormal"><span
style="font-size:9.5pt;font-family:Consolas;color:#2b91af">int64_t</span><span
style="font-size:9.5pt;font-family:Consolas;color:black"> point = (</span><span
style="font-size:9.5pt;font-family:Consolas;color:#2b91af">int64_t</span><span
style="font-size:9.5pt;font-family:Consolas;color:black">(frameno) *
pavStream->r_frame_rate.den *
pavStream->time_base.den) / (</span><span
style="font-size:9.5pt;font-family:Consolas;color:#2b91af">int64_t</span><span
style="font-size:9.5pt;font-family:Consolas;color:black">(pavStream->r_frame_rate.num)
*pavStream->time_base.num);</span></p>
<p class="MsoNormal"><span
style="font-size:9.5pt;font-family:Consolas;color:black"> </span></p>
<p class="MsoNormal"><span
style="font-size:9.5pt;font-family:Consolas;color:black">av_seek_frame(fmt_ctx,
VideoStreamIndex, point, 0);</span></p>
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Here point is always 0 as you are dividing integers. Also, as a
flag, you may want to use AVSEEK_FLAG_BACKWARD.<br>
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<pre class="moz-signature" cols="72">--
Gonzalo Garramuño</pre>
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