>
> Hello all,
>
> I am getting some errors when I try to open a video by passing a URL to
> av_open_input_file. These errors only persist for the first few seconds of
> the video and result in grey, blocky images. After about 3 seconds,
> everything returns to normal. There are no problems with my code if I
> download the video file first. There are also no problems if I call
> ffmpeg.exe with the URL. Unfortunately, I can't use ffmpeg.exe for my
> application. I've debugged my code, and it appears that the 'nal size'
> error occurs when the nal size + buffer pointer > buffer size. The buffer
> size is actually set by the packet size in AVPacket, but I'm not sure
> how/what I should change. Here's the code I'm using to open the file/get
> stream info:
>
> ---------------------
>
> char* in_filename = "
> http://www.youtube.com/get_video.php?video_id=00ySSAGa-S8&t=vjVQa1PpcFO_tEFiC_0X6awFENC1TOVsFXislW2bNrY%3D&fmt=18
> ";
>
> // Open video file for input
> if(av_open_input_file(&pFormatCtx, in_filename, NULL, 0, 0) != 0)
> return -1; // Couldn't open file
>
> // Retrieve stream information
> if(av_find_stream_info(pFormatCtx) < 0)
> return -1; // Couldn't find stream information
>
> ----------------------
>
> And here's the error information:
>
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '
> http://www.youtube.com/get_video.php?video_id=00ySSAGa-S8&t=vjVQa1PpcFMPZ6YrHvawaiLxF1-DkbrSrRz4dnMHx64%3D&fmt=18
> ':
> Duration: 00:03:33.15, start: 0.000000, bitrate: N/A
> Stream #0.0(und): Audio: aac, 44100 Hz, stereo, s16
> Stream #0.1(und): Video: h264, yuv420p, 480x360, 14.49 tb(r)
> Output #0, mp4, to 'C:\mydir\videonew.mp4':
> Stream #0.0: Video: mpeg4, yuv420p, 480x360, q=2-31, 2500 kb/s, 14.49
> tb(c)
> [h264 @ 0xa60070]AVC: nal size 21498
> [h264 @ 0xa60070]no frame!
> [h264 @ 0xa60070]AVC: nal size 49759
> [h264 @ 0xa60070]no frame!
> [h264 @ 0xa60070]AVC: nal size 20817
> [h264 @ 0xa60070]no frame!
> [h264 @ 0xa60070]AVC: nal size 17117
> [h264 @ 0xa60070]no frame!
> [h264 @ 0xa60070]AVC: nal size 54002
> [h264 @ 0xa60070]no frame!
> [h264 @ 0xa60070]AVC: nal size 44717
> [h264 @ 0xa60070]no frame!
> [h264 @ 0xa60070]AVC: nal size 47467
> [h264 @ 0xa60070]no frame!
> [h264 @ 0xa60070]AVC: nal size 40526
> [h264 @ 0xa60070]no frame!
> [h264 @ 0xa60070]AVC: nal size 55135
> [h264 @ 0xa60070]no frame!
> [h264 @ 0xa60070]AVC: nal size 57224
> [h264 @ 0xa60070]no frame!
> [h264 @ 0xa60070]AVC: nal size 22776
> [h264 @ 0xa60070]no frame!
> [h264 @ 0xa60070]AVC: nal size 56603
> [h264 @ 0xa60070]no frame!
> [h264 @ 0xa60070]AVC: nal size 35731
> [h264 @ 0xa60070]no frame!
> [h264 @ 0xa60070]AVC: nal size 34832
> [h264 @ 0xa60070]no frame!
> [h264 @ 0xa60070]AVC: nal size 21967
> [h264 @ 0xa60070]no frame!
> [h264 @ 0xa60070]number of reference frames exceeds max (probably corrupt
> input), discarding one
> [h264 @ 0xa60070]number of reference frames exceeds max (probably corrupt
> input), discarding one
> [h264 @ 0xa60070]number of reference frames exceeds max (probably corrupt
> input), discarding one
> [h264 @ 0xa60070]number of reference frames exceeds max (probably corrupt
> input), discarding one
> [h264 @ 0xa60070]number of reference frames exceeds max (probably corrupt
> input), discarding one
> [h264 @ 0xa60070]number of reference frames exceeds max (probably corrupt
> input), discarding one
> [h264 @ 0xa60070]number of reference frames exceeds max (probably corrupt
> input), discarding one
> [h264 @ 0xa60070]number of reference frames exceeds max (probably corrupt
> input), discarding one
> [h264 @ 0xa60070]number of reference frames exceeds max (probably corrupt
> input), discarding one
> [h264 @ 0xa60070]number of reference frames exceeds max (probably corrupt
> input), discarding one
> [h264 @ 0xa60070]number of reference frames exceeds max (probably corrupt
> input), discarding one
> [h264 @ 0xa60070]number of reference frames exceeds max (probably corrupt
> input), discarding one
> [h264 @ 0xa60070]number of reference frames exceeds max (probably corrupt
> input), discarding one
>
> Thanks for any help/direction you can provide.
>
> -Mike
>
>
>
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