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<p class="MsoNormal"><span style="color:#1F497D">All those presets I tried but didn’t help.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> libav-user-bounces@ffmpeg.org [mailto:libav-user-bounces@ffmpeg.org]
<b>On Behalf Of </b>Ashwin Chandra - SISA<br>
<b>Sent:</b> Friday, February 08, 2013 8:39 AM<br>
<b>To:</b> This list is about using libavcodec, libavformat, libavutil, libavdevice and libavfilter.<br>
<b>Subject:</b> Re: [Libav-user] Problem with using libavcodec with AV_CODEC_ID_H264<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">But the decoding_encoding example works for me without any changes. The problem is if you just want to encode two frames and flush them all out. With 25 there doesn’t seem to be any issues.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a href="mailto:libav-user-bounces@ffmpeg.org">libav-user-bounces@ffmpeg.org</a> [<a href="mailto:libav-user-bounces@ffmpeg.org">mailto:libav-user-bounces@ffmpeg.org</a>]
<b>On Behalf Of </b>Harald Jordan<br>
<b>Sent:</b> Friday, February 08, 2013 12:53 AM<br>
<b>To:</b> 'This list is about using libavcodec, libavformat, libavutil, libavdevice and libavfilter.'<br>
<b>Subject:</b> Re: [Libav-user] Problem with using libavcodec with AV_CODEC_ID_H264<o:p></o:p></span></p>
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</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-AU" style="color:#1F497D">If you did not make any changes to the open_video and add_video functions of the decoding_encoding example, it cannot work. For H264 you need to manually define a set a of H264 private settings before
opening the codec.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="color:#1F497D"><a href="http://stackoverflow.com/questions/3553003/encoding-h-264-with-libavcodec-x264">http://stackoverflow.com/questions/3553003/encoding-h-264-with-libavcodec-x264</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="color:#1F497D">Harry<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="DE" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Von:</span></b><span lang="DE" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a href="mailto:libav-user-bounces@ffmpeg.org">libav-user-bounces@ffmpeg.org</a> [<a href="mailto:libav-user-bounces@ffmpeg.org">mailto:libav-user-bounces@ffmpeg.org</a>]
<b>Im Auftrag von </b>Ashwin Chandra - SISA<br>
<b>Gesendet:</b> Freitag, 08. Februar 2013 00:29<br>
<b>An:</b> This list is about using libavcodec, libavformat, libavutil, libavdevice and libavfilter.<br>
<b>Betreff:</b> Re: [Libav-user] Problem with using libavcodec with AV_CODEC_ID_H264<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span lang="EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">To be clearer, I modified the decoding_encoding.c example in ffmpeg to cause the problem.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I basically changed the video_encode_example() to encode 1 second worth of video and then flush the delayed frame. The code below is exactly the same except 25 frames was replaced with 1 frame.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Now if I take this code block and duplicate it again, so that it basically runs twice, the second
</span><span style="font-size:9.5pt;font-family:Consolas">avcodec_encode_video2() will hang.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:green">/* encode 1 second of video */</span><span style="font-size:9.5pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">
<span style="color:blue">for</span>(i=0;i<1;i++) {<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> av_init_packet(&pkt);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> pkt.data = NULL;
<span style="color:green">// packet data will be allocated by the encoder</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> pkt.size = 0;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> fflush(stdout);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">
<span style="color:green">/* prepare a dummy image */</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">
<span style="color:green">/* Y */</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">
<span style="color:blue">for</span>(y=0;y<c->height;y++) {<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">
<span style="color:blue">for</span>(x=0;x<c->width;x++) {<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> frame->data[0][y * frame->linesize[0] + x] = x + y + i * 3;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">
<span style="color:green">/* Cb and Cr */</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">
<span style="color:blue">for</span>(y=0;y<c->height/2;y++) {<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">
<span style="color:blue">for</span>(x=0;x<c->width/2;x++) {<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> frame->data[1][y * frame->linesize[1] + x] = 128 + y + i * 2;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> frame->data[2][y * frame->linesize[2] + x] = 64 + x + i * 5;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> frame->pts = i;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">
<span style="color:green">/* encode the image */</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> ret = avcodec_encode_video2(c, &pkt, frame, &got_output);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">
<span style="color:blue">if</span> (ret < 0) {<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> fprintf(stderr,
<span style="color:#A31515">"Error encoding frame\n"</span>);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> exit(1);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">if</span> (got_output) {<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> printf(<span style="color:#A31515">"Write frame %3d (size=%5d)\n"</span>, i, pkt.size);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> fwrite(pkt.data, 1, pkt.size, f);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> av_free_packet(&pkt);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">
<span style="color:green">/* get the delayed frames */</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">
<span style="color:blue">for</span> (got_output = 1; got_output; i++) {<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> fflush(stdout);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> ret = avcodec_encode_video2(c, &pkt, NULL, &got_output);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">
<span style="color:blue">if</span> (ret < 0) {<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> fprintf(stderr,
<span style="color:#A31515">"Error encoding frame\n"</span>);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> exit(1);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">
<span style="color:blue">if</span> (got_output) {<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> printf(<span style="color:#A31515">"Write frame %3d (size=%5d)\n"</span>, i, pkt.size);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> fwrite(pkt.data, 1, pkt.size, f);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> av_free_packet(&pkt);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> }<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a href="mailto:libav-user-bounces@ffmpeg.org">libav-user-bounces@ffmpeg.org</a> [<a href="mailto:libav-user-bounces@ffmpeg.org">mailto:libav-user-bounces@ffmpeg.org</a>]
<b>On Behalf Of </b>Ashwin Chandra - SISA<br>
<b>Sent:</b> Thursday, February 07, 2013 3:08 PM<br>
<b>To:</b> <a href="mailto:libav-user@ffmpeg.org">libav-user@ffmpeg.org</a><br>
<b>Subject:</b> [Libav-user] Problem with using libavcodec with AV_CODEC_ID_H264<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none">I have some code that takes a running stream of uncompressed video data and encodes it using
<span style="font-size:9.5pt;font-family:Consolas">AV_CODEC_ID_H264.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">The sequence I follow is<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2;text-autospace:none">
<![if !supportLists]><span style="font-size:9.5pt;font-family:Consolas"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:9.5pt;font-family:Consolas">Call avcodec_encode_video2 on the AVFrame which contains my uncompressed frame.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2;text-autospace:none">
<![if !supportLists]><span style="font-size:9.5pt;font-family:Consolas"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:9.5pt;font-family:Consolas">Call avcodec_encode_video2 again passing NULL in the AVFrame parameter.<o:p></o:p></span></p>
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<![if !supportLists]><span style="font-size:9.5pt;font-family:Consolas"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:9.5pt;font-family:Consolas">Repeat 2. Until a frame arrives from the encoder.<o:p></o:p></span></p>
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<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">This seems to work fine if the codec is MPEG2, but with H264, it hangs inside avcodec_encode_video2 at step 2) on the second frame. I don’t have debug symbols
and can’t figure out why. Does there need to be a minimum set of uncompressed data in the encoder before trying to flush out an encoded frame for H264? If so, how do I know when it is safe to flush a frame?<o:p></o:p></span></p>
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