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• youtube-dl sometime hangs with "[ffmpeg] Correcting container"

  20 mai 2018, par user292344

  Ubuntu 16.04

  /usr/local/bin/youtube-dl --version
  
  2018.05.09

  I have a bash script that attemts to download a youtube video. The output is below. The problem is that sometimes it works perfectly (completes quickly).
  But most of the time it hangs on "Correcting container....". Does anyone know why ?

  + /usr/local/bin/youtube-dl --verbose -x 'https://www.youtube.com/watch?v=8HVWitAW-Qg'
  
  
  
  [debug] System config: []
  
  
  
  [debug] User config: []
  
  
  
  [debug] Custom config: []
  
  
  
  [debug] Command-line args: [u'--verbose', u'-x', u'https://www.youtube.com/watch?v=8HVWitAW-Qg']
  
  
  
  [debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
  
  
  
  [debug] youtube-dl version 2018.05.09
  
  
  
  [debug] Python version 2.7.12 (CPython) - Linux-4.4.0-124-generic-x86_64-with-Ubuntu-16.04-xenial
  
  
  
  [debug] exe versions: avconv 2.8.14-0ubuntu0.16.04.1, avprobe 2.8.14-0ubuntu0.16.04.1, ffmpeg 2.8.14-0ubuntu0.16.04.1, ffprobe 2.8.14-0ubuntu0.16.04.1, rtmpdump 2.4
  
  
  
  [debug] Proxy map: {}
  
  
  
  [youtube] 8HVWitAW-Qg: Downloading webpage
  
  
  
  [youtube] 8HVWitAW-Qg: Downloading video info webpage
  
  
  
  [youtube] 8HVWitAW-Qg: Extracting video information
  
  
  
  [debug] Invoking downloader on u'https://r5---sn-5uaeznkl.googlevideo.com/videoplayback?expire=1526159728&source=youtube&key=yt6&mime=audio%2Fmp4&sparams=clen%2Cdur%2Cei%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cusequic%2Cexpire&keepalive=yes&lmt=1518142590597815&dur=231.131&mv=m&mt=1526137933&ms=au%2Conr&signature=18BB34F3716B412AC5757872DD2AF402B6EE20D2.43D2E68B5A5ED2E2D3076DF9264B9BB723484821&ip=71.81.217.251&c=WEB&initcwndbps=1583750&mn=sn-5uaeznkl%2Csn-p5qs7n7l&clen=3671757&gir=yes&id=o-AOxj8Rg2IuZek8KwvgPy-N7_FSGzxQ0Zl2HX1T4gepLf&ipbits=0&fvip=5&ei=EAX3WqbOH8fg4QSlkrGoAg&pl=20&mm=31%2C26&itag=140&usequic=no&requiressl=yes&ratebypass=yes'
  
  
  
  [download] Destination: Top 10 cute kitten videos compilation-8HVWitAW-Qg.m4a
  
  
  
  [download] 100% of 3.50MiB in 00:00
  
  
  
  [ffmpeg] Correcting container in "Top 10 cute kitten videos compilation-8HVWitAW-Qg.m4a"
  
  
  
  [debug] ffmpeg command line: avconv -y -i 'file:Top 10 cute kitten videos compilation-8HVWitAW-Qg.m4a' -c copy -f mp4 'file:Top 10 cute kitten videos compilation-8HVWitAW-Qg.temp.m4a'
  
  
  
  ^C
  
  ERROR: Interrupted by user

• FFMPEG corrupted frame when streaming in UDP (MPEGTS)

  17 décembre 2020, par user37616

  I am working on a screen streaming program, till now, I can capture and encode my screen into a video perfectly. 
However, whenever I try to stream it over LAN, and play using Mplayer, it is able to run in simple desktop (text document, etc...) but when I try to play video the frame stated to corrupted until I quit the video (this video cause the most corrupted frame https://www.youtube.com/watch?v=1La4QzGeaaQ&t=230s)

  



  I am not really sure why when streaming, I got corrupted frame with the youtube video but when save it to a file (change URL from udp ://192.168.1.xxx:YYYY to file name C :\Test.ts) there were no corrupted frame at all.
 My Mplayer log :

  



  `V:   0.0 1563/1563 51% 43%  0.0% 0 0
[h264 @ 0000000001d04940]Invalid NAL unit 0, skipping.
[h264 @ 0000000001d04940]error while decoding MB 23 51, bytestream -64
[h264 @ 0000000001d04940]concealing 2066 DC, 2066 AC, 2066 MV errors in I frame
V:   0.0 1564/1564 51% 43%  0.0% 0 0
[h264 @ 0000000001d04940]concealing 7598 DC, 7598 AC, 7598 MV errors in P frame
V:   0.0 1652/1652 50% 43%  0.0% 0 0
[h264 @ 0000000001d04940]Invalid NAL unit 0, skipping.
[h264 @ 0000000001d04940]error while decoding MB 26 49, bytestream -55
[h264 @ 0000000001d04940]concealing 2303 DC, 2303 AC, 2303 MV errors in I frame
V:   0.0 1653/1653 50% 43%  0.0% 0 0
[h264 @ 0000000001d04940]concealing 7727 DC, 7727 AC, 7727 MV errors in P frame
V:   0.0 1741/1741 49% 43%  0.0% 0 0
[h264 @ 0000000001d04940]Invalid NAL unit 0, skipping.
[h264 @ 0000000001d04940]error while decoding MB 65 62, bytestream -57
[h264 @ 0000000001d04940]concealing 704 DC, 704 AC, 704 MV errors in I frame
V:   0.0 1742/1742 49% 43%  0.0% 0 0`


  



  Stream initialize code

  



  static void Stream_ini(const char *Url, AVFormatContext *&ofmt_ctx, AVCodec *codec, AVCodecContext *c, AVStream *&out_stream)
{
    int ret;


    avformat_alloc_output_context2(&ofmt_ctx, NULL, "mpegts", Url);
    out_stream = avformat_new_stream(ofmt_ctx, codec)
    out_stream->codec = c;
    av_dump_format(ofmt_ctx, 0, Url, 1);


    if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
        out_stream->codec->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
    if (!(ofmt_ctx->flags & AVFMT_NOFILE))
    {
        ret = avio_open(&ofmt_ctx->pb, Url, AVIO_FLAG_WRITE);
        if (ret < 0)
        {
            printf("Could not open output URL '%s'", Url);
            return;
        }
    }


    ret = avformat_write_header(ofmt_ctx, NULL);

    if (ret < 0)
    {
        printf("Error occurred when opening output URL\n");
        return;
    }


}


  



  this code will get the captured screen and send it to encoder :

  



  ScreenCap.load_screen_data(inFrame,timmer)  // this will capture screen and return the time and AVFrame for encoding
sws_scale(ctx, inFrame->data, inFrame->linesize, 0,c->height, frame->data, frame->linesize);

frame->pts = (timmer - first_frame_time) / fps;
EncodeToPkT(c, frame, pkt, ofmt_ctx,out_stream);

av_frame_free(&inFrame);


  



  the AVFrame will then be send to encoder using avcodec_send_frame() to get Packet data and av_interleaved_write_frame() to stream it over LAN.

  



  All error check are removed for simplicity

  



  Also, this is my AVCodecContex setting for the encoder :

  



  c->bit_rate = 15000000;
c->width = 1920;
c->height = 1080;
c->time_base = AVRational{ 1, 90 };
c->framerate = AVRational{ 90, 1 };
c->gop_size = 90;
c->max_b_frames = 0;
c->pix_fmt = AV_PIX_FMT_RGB0;


  



  I also notice it only happen when I increase encoder bitrate (15 MBIT) but when lower it down to (10 MBIT) it happen less. And when lower it down to 2 MBIT the corrupted frame not happen anymore however the quality is really bad.
  
I test the streaming in LAN using : PC -> cable ->laptop, PC->wireless->laptop, PC->Virtual PC, PC only (enter PC IP address in both program and Mplayer), all got the same result.

  



  I also test my DXGICap.load_screen_data function by make it output raw image and there were no corrupted image at all

  



  Does anybody have an idea why.

  



  Thank Nam.

  


• FFMPEG Crop with side by side merge

  24 juin 2019, par Alan

  I am trying to create a shell/ffmpeg script that can show multiple files after they have been processed using different filters in a side by side / tiled way. An example of desired output would be : https://www.youtube.com/watch?v=DoPuhMRYem4.

  In order to create the desired output I need to crop off the right half of video1 and the left half of video2 and then join them back with [video1+video2] side by side. I have played around with a bunch of different ways of joining them, this does OK :

  ffmpeg -i input1.mp4 -i input2.mp4 -filter_complex "
  
  nullsrc=size=800x400 [background];
  
  [0:v] setpts=PTS-STARTPTS, scale=400x400 [left];
  
  [1:v] setpts=PTS-STARTPTS, scale=400x400 [right];
  
  [background][left]       overlay=shortest=1       [background+left];
  
  [background+left][right] overlay=shortest=1:x=400 [left+right]
  
  " -map '[left+right]' joined.mp4

  How can I modify this to detect the video width (they won’t always be the same width), divide the width in half and crop either the left or right sides off ?