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• Identify local vs live URL FFmpeg

  9 juin 2014, par Tarun Seera

  Hi I am using FFmpeg in my iOS app for stream local and live URL.
  Is there any way to identify the URL which I am opening is local or live.
  Actually I want to specify the rtsp_transport in avformat_open_input accordingly.
  If I do not specify the transport its by default taking UDP.
  In UPD I am losing packets in live stream.So i want to specify the transport TCP for live and default for local url.

• FFmpeg stuck on frame 0 during time-lapse conversion with `-ss` start time

  2 janvier 2021, par rgov

  I have a long video that I'd like to speed up into a time-lapse. Following the FFmpeg wiki, I came up with this incantation :

  



  ffmpeg -i IMG_0238.MOV -r 60 -ss 00:04:41 -filter:v "setpts=PTS/60.0" -an output.mp4


  



  It should clip off the first few minutes, then create a new 60fps video file at 60x the speed.

  



  Although it spins all my CPU cores up to 100%, the status bar simply shows frame=    0 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x and never progresses.

  



  The problem seems related to the -ss 00:04:41 flag, which specifies the start time ; I want to drop the first 4 minutes 41 seconds of source video. When I omit this option, the video conversion succeeds.

  



  Full log follows.

  



  ---

  



  ffmpeg version 3.4.1 Copyright (c) 2000-2017 the FFmpeg developers
  built with Apple LLVM version 9.1.0 (clang-902.0.30)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.4.1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fb59b800000] stream 2, missing mandatory atoms, broken header
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fb59b800000] stream 3, missing mandatory atoms, broken header
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'IMG_0238.MOV':
  Metadata:
    major_brand     : qt  
    minor_version   : 0
    compatible_brands: qt  
    creation_time   : 2017-04-20T16:25:14.000000Z
    com.apple.quicktime.location.ISO6709: +36.4610+025.3727+123.613/
    com.apple.quicktime.make: Apple
    com.apple.quicktime.model: iPhone 7
    com.apple.quicktime.software: 10.3.1
    com.apple.quicktime.creationdate: 2017-04-20T19:25:13+0300
  Duration: 01:22:45.53, start: -0.000023, bitrate: 44171 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 3840x2160, 44077 kb/s, 30 fps, 30 tbr, 600 tbn, 1200 tbc (default)
    Metadata:
      rotate          : 180
      creation_time   : 2017-04-20T16:25:14.000000Z
      handler_name    : Core Media Data Handler
      encoder         : H.264
    Side data:
      displaymatrix: rotation of -180.00 degrees
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 84 kb/s (default)
    Metadata:
      creation_time   : 2017-04-20T16:25:14.000000Z
      handler_name    : Core Media Data Handler
    Stream #0:2(und): Data: none (mebx / 0x7862656D) (default)
    Metadata:
      creation_time   : 2017-04-20T16:25:14.000000Z
      handler_name    : Core Media Data Handler
    Stream #0:3(und): Data: none (mebx / 0x7862656D) (default)
    Metadata:
      creation_time   : 2017-04-20T16:25:14.000000Z
      handler_name    : Core Media Data Handler
File 'output.mp4' already exists. Overwrite ? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x7fb59b82b800] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
[libx264 @ 0x7fb59b82b800] profile High, level 5.2
[libx264 @ 0x7fb59b82b800] 264 - core 148 r2795 aaa9aa8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - 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=6 lookahead_threads=1 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, mp4, to 'output.mp4':
  Metadata:
    major_brand     : qt  
    minor_version   : 0
    compatible_brands: qt  
    com.apple.quicktime.creationdate: 2017-04-20T19:25:13+0300
    com.apple.quicktime.location.ISO6709: +36.4610+025.3727+123.613/
    com.apple.quicktime.make: Apple
    com.apple.quicktime.model: iPhone 7
    com.apple.quicktime.software: 10.3.1
    encoder         : Lavf57.83.100
    Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 3840x2160, q=-1--1, 60 fps, 15360 tbn, 60 tbc (default)
    Metadata:
      encoder         : Lavc57.107.100 libx264
      creation_time   : 2017-04-20T16:25:14.000000Z
      handler_name    : Core Media Data Handler
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
      displaymatrix: rotation of -0.00 degrees
frame=    0 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x


  


• Instagram Live API using Graph API

  16 août 2020, par Deepak Sharma

  I see Facebook has new graph API for live video. But I am not sure if it can used to go live on Instagram as well. I see third party softwares such as Yellow Duck being able to go live on Instagram. Not only that, a lot of softwares support streaming to any destination by just using an RTMP link. So does that mean any service that can generate an RTMP stream can broadcast to Instagram (with/without login to Instagram) ? How does Instagram live work if one can generate an RTMP stream ? Finally, if I can generate an RTMP/RTMPS stream locally on my desktop or phone using ffmpeg libraries, can I stream to Instagram ?