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<p class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed">I get colored jpeg images of OpenCV::Mat type and I create from them video using avcodec. The video that I get is upside-down, black & white and each row of each frame is shifted
and I got diagonal line. What could be the reason for such output?<o:p></o:p></p>
<p class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed">Follow this link (https://picasaweb.google.com/lh/photo/ZNQeoPw8YFBa-iFpzuYi4dMTjNZETYmyPJy0liipFm0?feat=directlink) to watch the video I get using avcodec.<o:p></o:p></p>
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I'm using <span style="font-size:9.5pt;font-family:Consolas">acpicture_fill</span> to create avFrame from cv::Mat frame!<o:p></o:p></p>
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<o:p> </o:p></p>
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P.S.<o:p></o:p></p>
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Each cv::Mat cvFrame has width=810, height=610, step=2432<o:p></o:p></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
I noticed that <span style="font-size:9.5pt;font-family:Consolas">avFrame (that is filled by acpicture_fill) has linesize[0]=2430<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas">I tried manually setting</span> avFrame->linesizep0]=2432 and not 2430 but it still didn't helped.<o:p></o:p></p>
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<o:p> </o:p></p>
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<span style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas">======== CODE =========================================================<o:p></o:p></span></p>
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<span style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas">AVCodec *encoder = avcodec_find_encoder(AV_CODEC_ID_H264);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas">AVStream *outStream = avformat_new_stream(outContainer, encoder);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas">avcodec_get_context_defaults3(outStream->codec, encoder);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
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<span style="font-size:9.5pt;font-family:Consolas">outStream->codec->pix_fmt = AV_PIX_FMT_YUV420P;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas">outStream->codec->width = 810;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas">outStream->codec->height = 610;</span><o:p></o:p></p>
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<span style="font-size:9.5pt;font-family:Consolas;color:green">//...</span><o:p></o:p></p>
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<span style="font-size:9.5pt;font-family:Consolas;color:green"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas">SwsContext *swsCtx = sws_getContext(outStream->codec->width, outStream->codec->height, PIX_FMT_RGB24,<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> outStream->codec->width, outStream->codec->height, outStream->codec->pix_fmt, SWS_BICUBIC, NULL, NULL, NULL);<o:p></o:p></span></p>
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<o:p> </o:p></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas;color:blue">for</span><span style="font-size:9.5pt;font-family:Consolas"> (uint i=0; i < frameNums; i++)<o:p></o:p></span></p>
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<span style="font-size:9.5pt;font-family:Consolas">{<o:p></o:p></span></p>
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<span style="font-size:9.5pt;font-family:Consolas;color:green">// get frame at location I using OpenCV</span><span style="font-size:9.5pt;font-family:Consolas"><o:p></o:p></span></p>
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<span style="font-size:9.5pt;font-family:Consolas"> cv::Mat cvFrame;<o:p></o:p></span></p>
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<span style="font-size:9.5pt;font-family:Consolas"> myReader.getFrame(cvFrame, i);
<o:p></o:p></span></p>
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<span style="font-size:9.5pt;font-family:Consolas"> cv::Size frameSize = cvFrame.size();
<o:p></o:p></span></p>
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<span style="font-size:9.5pt;font-family:Consolas;color:green">//Each cv::Mat cvFrame has width=810, height=610, step=2432<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> <o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
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<span style="font-size:9.5pt;font-family:Consolas"> <span style="color:green">
// create AVPicture from cv::Mat frame</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> avpicture_fill((AVPicture*)avFrame, cvFrame.data, PIX_FMT_BGR24, outStream->codec->width, outStream->codec->height);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-indent:36.0pt;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas">avFrame->width = frameSize.width;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> avFrame->height = frameSize.height;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-indent:36.0pt;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas;color:green">// rescale to outStream format</span><span style="font-size:9.5pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> sws_scale(swsCtx, avFrame->data, avFrame->linesize, 0, outStream->codec->height, avFrameRescaledFrame->data, avFrameRescaledFrame ->linesize);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-indent:36.0pt;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas">encoderRescaledFrame->pts=i;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-indent:36.0pt;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas">avFrameRescaledFrame->width = frameSize.width;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> avFrameRescaledFrame->height = frameSize.height;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-indent:36.0pt;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-indent:36.0pt;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas">av_init_packet(&avEncodedPacket);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> avEncodedPacket.data = NULL;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> avEncodedPacket.size = 0;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> <span style="color:green">
// encode rescaled frame</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">
if</span>(avcodec_encode_video2(outStream->codec, &avEncodedPacket, avFrameRescaledFrame, &got_frame) < 0) exit(1);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">
if</span>(got_frame)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> {<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">
if</span> (avEncodedPacket.pts != AV_NOPTS_VALUE)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> avEncodedPacket.pts = av_rescale_q(avEncodedPacket.pts, outStream->codec->time_base, outStream->time_base);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">
if</span> (avEncodedPacket.dts != AV_NOPTS_VALUE)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> avEncodedPacket.dts = av_rescale_q(avEncodedPacket.dts, outStream->codec->time_base, outStream->time_base);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> <span style="color:green">
// outContainer is "mp4"</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> av_write_frame(outContainer, & avEncodedPacket);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> <o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> av_free_packet(&encodedPacket);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas">}<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed"><o:p> </o:p></p>
<p class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed"><span lang="HE" dir="RTL" style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
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