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• C - FFmpeg streaming from a C program ?

  16 août 2017, par golmschenk

  I’m looking to replicate an FFmpeg command-line command in my C code. Specifically I would like to be able to run :

  ffmpeg -re -i video.mp4 -f mpegts udp://localhost:7777

  One thing I’ve noticed when looking at people’s code who have used the libraries of FFmpeg in their own code is that they often have a few hundred lines of code for a single command similar to an FFmpeg command-line command. I’m guessing this is just because they are doing something very specific, because if I can run that short command on my command line and get what I want it should probably only take about ten lines of code to do the same thing in my C code. This should only take about that much work right ? Why would it take much more ?

  I’m having a bit of difficulty finding explanations on how to use the streaming capabilities of the FFmpeg libraries that aren’t overly complex because they’re for a very specific purpose. Can anyone explain how I might go about writing the code for the above command ? Or at the very least point me to some documentation explaining how to write such a script/program ? Thank you much !

  EDIT : I do hope to run this from an iPhone app eventually so I won’t just be able to straight up call FFmpeg from my program. I’ll need to use the libraries used by FFmpeg.

• Can not play local rtsp URL using FFmpeg in iOS

  12 juin 2015, par Priyanka

  I am using FFmpeg for stream rtsp URL in iOS.
  I am trying to stream a local url but my app is failed to open url
  avformat_open_input method always return -5

  I have played the same url rtsp://172.16.1.226:5544/1 on VLC media player on my iPhone and macbook it works on both.

  After few research i have found there is some problem with rtsp_transport

  I was using av_dict_set(&serverOpt, "rtsp_transport", "tcp", 0); for the server configuration while opening url and the result is can not open feed.

  When I changed it to av_dict_set(&serverOpt, "rtsp_transport", "udp", 1);
  I am able to open url successfully but I continuously getting error rtsp 1 missing packet and so on.

  Can anybody help what should be the right configuration while opening a local rtsp url using ffmpeg.
  Should i need to update av_dict_set(&serverOpt, "rtsp_transport", "udp", 1)

  Thanks in advance

• FFMPEG unwanted rotation

  5 mars 2015, par Ben

  When I add a watermark image with a landscape orientation to a video that has a portrait orientation the video automatically rotates to landscape. How do I prevent this ? Also, the audio file isn’t being merged into the output. How can I include the audio.mp3 to be the sole audio track ?

  ffmpeg -i 1425500438.MOV -i hashtag.png -itsoffset 00:00:07 -i audio.mp3  -filter_complex "[0:v]curves=preset=vintage[a];[a][1:v]overlay=10:10[out]"  -vcodec libx264 -pix_fmt yuv420p -ss 0:0:07 -t 14 -map "[out]" -y processed.mov

  EDIT****

  ffmpeg version 2.1.4 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Mar 19 2014 12:48:02 with Apple LLVM version 5.1 (clang-503.0.38) (based on LLVM 3.4svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.1.4 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid --enable-libfreetype --enable-libvorbis --enable-libvpx --enable-librtmp --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-aacenc --enable-libass --enable-ffplay --enable-libspeex --enable-libschroedinger --enable-libfdk-aac --enable-libopus --enable-frei0r --enable-libopenjpeg --extra-cflags='-I/usr/local/Cellar/openjpeg/1.5.1/include/openjpeg-1.5 '
  
    libavutil      52. 48.101 / 52. 48.101
  
    libavcodec     55. 39.101 / 55. 39.101
  
    libavformat    55. 19.104 / 55. 19.104
  
    libavdevice    55.  5.100 / 55.  5.100
  
    libavfilter     3. 90.100 /  3. 90.100
  
    libavresample   1.  1.  0 /  1.  1.  0
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1425500438.MOV':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      creation_time   : 2015-03-04 20:20:14
  
      encoder         : 8.1.2
  
      encoder-eng     : 8.1.2
  
      date            : 2015-03-04T14:20:14-0600
  
      date-eng        : 2015-03-04T14:20:14-0600
  
      model           : iPhone 6
  
      model-eng       : iPhone 6
  
      make            : Apple
  
      make-eng        : Apple
  
    Duration: 00:00:10.56, start: 0.000000, bitrate: 703 kb/s
  
      Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 480x360, 696 kb/s, 30.02 fps, 30.08 tbr, 600 tbn, 1200 tbc (default)
  
      Metadata:
  
        rotate          : 90
  
        creation_time   : 2015-03-04 20:20:14
  
        handler_name    : Core Media Data Handler
  
  Input #1, image2, from 'hashtag.png':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
  
      Stream #1:0: Video: png, rgba, 131x29, 25 tbr, 25 tbn, 25 tbc
  
  Input #2, mp3, from 'audio.mp3':
  
    Metadata:
  
      encoder         : Lavf55.19.104
  
    Duration: 00:00:10.44, start: 0.000000, bitrate: 128 kb/s
  
      Stream #2:0: Audio: mp3, 16000 Hz, stereo, s16p, 128 kb/s
  
  [libx264 @ 0x7f9894017200] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 AVX AVX2 FMA3 BMI1 BMI2
  
  [libx264 @ 0x7f9894017200] profile High, level 3.0
  
  [libx264 @ 0x7f9894017200] 264 - core 125 - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mov, to 'processed.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      make-eng        : Apple
  
      make            : Apple
  
      encoder-eng     : 8.1.2
  
      date            : 2015-03-04T14:20:14-0600
  
      date-eng        : 2015-03-04T14:20:14-0600
  
      model           : iPhone 6
  
      model-eng       : iPhone 6
  
      encoder         : Lavf55.19.104
  
      Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 480x360, q=-1--1, 11552 tbn, 30.08 tbc (default)
  
  Stream mapping:
  
    Stream #0:0 (h264) -> curves
  
    Stream #1:0 (png) -> overlay:overlay
  
    overlay -> Stream #0:0 (libx264)
  
  Press [q] to stop, [?] for help
  
  frame=  422 fps=413 q=-1.0 Lsize=     361kB time=00:00:13.96 bitrate= 211.9kbits/s dup=303 drop=0    
  
  video:356kB audio:0kB subtitle:0 global headers:0kB muxing overhead 1.574185%
  
  [libx264 @ 0x7f9894017200] frame I:2     Avg QP:20.09  size: 19764
  
  [libx264 @ 0x7f9894017200] frame P:134   Avg QP:22.29  size:  2248
  
  [libx264 @ 0x7f9894017200] frame B:286   Avg QP:28.02  size:    79
  
  [libx264 @ 0x7f9894017200] consecutive B-frames:  9.2%  0.0%  3.6% 87.2%
  
  [libx264 @ 0x7f9894017200] mb I  I16..4:  6.6% 45.0% 48.4%
  
  [libx264 @ 0x7f9894017200] mb P  I16..4:  1.8%  2.4%  0.7%  P16..4: 40.8% 13.6%  4.5%  0.0%  0.0%    skip:36.1%
  
  [libx264 @ 0x7f9894017200] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8: 10.9%  0.1%  0.0%  direct: 0.0%  skip:89.0%  L0:56.5% L1:42.3% BI: 1.2%
  
  [libx264 @ 0x7f9894017200] 8x8 transform intra:47.6% inter:61.5%
  
  [libx264 @ 0x7f9894017200] coded y,uvDC,uvAC intra: 51.3% 81.4% 36.7% inter: 5.6% 8.5% 0.5%
  
  [libx264 @ 0x7f9894017200] i16 v,h,dc,p: 21% 27% 12% 40%
  
  [libx264 @ 0x7f9894017200] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 27% 19%  5%  4%  4%  7%  5%  6%
  
  [libx264 @ 0x7f9894017200] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 35% 22% 12%  4%  5%  5%  6%  4%  6%
  
  [libx264 @ 0x7f9894017200] i8c dc,h,v,p: 40% 28% 22% 10%
  
  [libx264 @ 0x7f9894017200] Weighted P-Frames: Y:16.4% UV:10.4%
  
  [libx264 @ 0x7f9894017200] ref P L0: 73.7% 12.2% 11.7%  2.3%  0.2%
  
  [libx264 @ 0x7f9894017200] ref B L0: 93.5%  5.8%  0.7%
  
  [libx264 @ 0x7f9894017200] ref B L1: 97.2%  2.8%
  
  [libx264 @ 0x7f9894017200] kb/s:207.25