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• Getting incorrect output resolution ffmpeg

  29 octobre 2011, par Adam

  I am capturing an RTSP stream from a security camera, and transcoding it for (live streaming) to iphone, using OSX as the encoding platform.
  I have it working correctly, and Im tuning it.
  However, it seems that it is not outputting the requested resolution. This is my script

  /Applications/SecurityCamera/openRTSP -v -c -t rtsp://10.0.1.118/ch1-s1 | \
  
      /Applications/SecurityCamera/ffmpeg \
  
      -r 10 -i - \
  
      -y -an -ab 64000 -f mpegts -vcodec copy -s 960x640 \
  
      -flags +loop -cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 \
  
      -subq 5 -trellis 1 -refs 1 -coder 0 -me_range 16  -keyint_min 25 -sc_threshold 40 \
  
      -i_qfactor 0.71 -bt 400k -maxrate 524288 -bufsize 524288 \
  
      -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -level 30 \
  
      -aspect 960:640 -r 10 -g 10 -async 2 -\
  
      | /Applications/SecurityCamera/mediastreamsegmenter -b http://hydracam.dyndns.org:8080/ -f /Library/WebServer/Documents/ -i stream.m3u8 -t 10 -s 4 -D

  This is the status report :

  Input #0, h264, from 'pipe:':
  
  
  
    Duration: N/A, bitrate: N/A
  
    Stream #0.0: Video: h264, yuv420p, 1600x1200, 10 fps, 10 tbr, 1200k tbn, 20 tbc
  
    [mpegts @ 0x10100c200] muxrate VBR, pcr every 1 pkts, sdt every 200, pat/pmt every 40 pkts
  
    Output #0, mpegts, to 'pipe:':
  
    Metadata:
  
      encoder         : Lavf52.93.0
  
      Stream #0.0: Video: libx264, yuv420p, 1600x1200 [PAR 1:1 DAR 4:3], q=2-31, 90k tbn, 10 tbc
  
  Stream mapping:
  
    Stream #0.0 -> #0.0

  You can see that its working, but it is outputting 1600x1200 for some reason.

  If I change the -vcodec copy to -vcodec libx264 then I get the correct status report (stating 960x640, correct), but the streaming halts after 54 frames (see output below)

  Seems stream 0 codec frame rate differs from container frame rate: 20.00 (20/1) -> 10.00 (20/2)
  
  Input #0, h264, from 'pipe:':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0.0: Video: h264, yuv420p, 1600x1200, 10 fps, 10 tbr, 1200k tbn, 20 tbc
  
  [buffer @ 0x100d02420] w:1600 h:1200 pixfmt:yuv420p
  
  [scale @ 0x100d026f0] w:1600 h:1200 fmt:yuv420p -> w:960 h:640 fmt:yuv420p flags:0x4
  
  [libx264 @ 0x10100d400] using SAR=1/1
  
  [libx264 @ 0x10100d400] frame MB size (60x40) > level limit (1620)
  
  [libx264 @ 0x10100d400] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64 SlowCTZ SlowAtom
  
  [libx264 @ 0x10100d400] profile Constrained Baseline, level 3.0
  
  [mpegts @ 0x10100c200] muxrate VBR, pcr every 1 pkts, sdt every 200, pat/pmt every 40 pkts
  
  Output #0, mpegts, to 'pipe:':
  
    Metadata:
  
      encoder         : Lavf52.93.0
  
      Stream #0.0: Video: libx264, yuv420p, 960x640 [PAR 1:1 DAR 3:2], q=10-51, 200 kb/s, 90k tbn, 10 tbc
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  read pmap fffps=  3 q=37.0 size=      37kB time=0.10 bitrate=3008.0kbits/s    bits/s    
  
  video pid set at 100
  
  found sequence start
  
    next segment value 1026000
  
  written bytes 376 skipped 0
  
  frame=   54 fps=  2 q=-1.0 Lsize=     160kB time=5.40 bitrate= 242.0kbits/s    
  
  video:141kB audio:0kB global headers:0kB muxing overhead 12.872737%
  
  frame I:6     Avg QP:34.68  size: 23524
  
  [libx264 @ 0x10100d400] frame P:48    Avg QP:41.53  size:    75
  
  [libx264 @ 0x10100d400] mb I  I16..4: 63.9%  0.0% 36.1%
  
  [libx264 @ 0x10100d400] mb P  I16..4:  0.1%  0.0%  0.0%  P16..4:  0.8%  0.1%  0.0%  0.0%  0.0%    skip:99.0%
  
  [libx264 @ 0x10100d400] final ratefactor: 38.54
  
  [libx264 @ 0x10100d400] coded y,uvDC,uvAC intra: 57.7% 22.3% 2.0% inter: 0.0% 0.1% 0.0%
  
  [libx264 @ 0x10100d400] i16 v,h,dc,p: 23% 35% 27% 15%
  
  [libx264 @ 0x10100d400] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 32% 16%  4%  3%  3%  7%  4%  8%
  
  [libx264 @ 0x10100d400] i8c dc,h,v,p: 83% 11%  5%  0%
  
  [libx264 @ 0x10100d400] kb/s:214.43

• Multi bitrate live HLS with FFmpeg on Windows

  16 mai 2014, par Nioreh

  I am trying to encode a live stream into Apple HLS for iPhone on windows. I was looking at different options and wowza can do it, but doesn’t support CDN distribution of HLS as far as I can see. Plus it costs a lot of money.

  What I did find was this site : http://www.espend.de/artikel/iphone-ipad-ipod-http-streaming-segmenter-and-m3u8-windows.html

  I can now set up a single bitrate stream easily, but my goal is an adapive multi-bitrate live stream. Is it possible ? For VOD content it can easily be accomplished with creating the different qualities then linking to them in a new m3u8, but how would this be done in live ?

  I can of course set up three quality live streams and link to them in an m3u8, but how will I get them GOP-aligned in this case ?

  My initial thought was to have one ffmpeg instance create all qualities and re-stream those outputs to new ffmpeg-instances that just remux and pipe to the segmenter. But I would need some way of streaming locally between instances. Can that be done ?

  If anyone has a nice solution to this, or can link to other software capable of live HLS on windows, I would appreciate any input.

  Have a great day !
  Regards
  Carl

• FFmpeg decoding H264

  25 septembre 2011, par Steve McFarlin

  I am decoding a H264 stream using FFmpeg on the iPhone. I know the H264 stream is valid and the SPS/PPS are correct as VLC, Quicktime, Flash all decode the stream properly. The issue I am having on the iPhone is best shown by this picture.

  

  It is as if the motion vectors are being drawn. This picture was snapped while there was a lot of motion in the image. If the scene is static then there are dots in the corners. This always occurs with predictive frames. The blocky colors are also an issue.

  I have tried various build settings for FFmpeg such as turning off optimizations, asm, neon, and many other combinations. Nothing seems to alter the behavior of the decoder. I have also tried the Works with HTML, Love and Peace releases, and also the latest GIT sources. Is there maybe a setting I am missing, or maybe I have inadvertently enabled some debug setting in the decoder.

  Edit

  I am using sws_scale to convert the image to RGBA. I have tried various different pixel formats with the same results.

  sws_scale(convertCtx, (const uint8_t**)srcFrame->data, srcFrame->linesize, 0, codecCtx->height, dstFrame->data, dstFrame->linesize);

  I am using PIX_FMT_YUV420P as the source format when setting up my codec context.