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• MPEG-TS Segments HTTP Live Streaming

  5 juin 2013, par user1069624

  I'm trying to interleave MPEG-TS segments but failing. One set of segments was actually captured using the built in camera in the laptop, then encoded using FFMPEG with the following command :

  ffmpeg -er 4 -y -f video4linux2 -s 640x480 -r 30 -i %s -isync -f mpegts -acodec libmp3lame -ar 48000 -ab 64k -s 640x480 -vcodec libx264 -fflags +genpts -b 386k -coder 0 -me_range 16 -keyint_min 25 -i_qfactor 0.71 -bt 386k -maxrate 386k -bufsize 386k -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -aspect 640:480

  And the other one is an avi file that was encoded using the following command :

  fmpeg -er 4 -y -f avi -s 640x480 -r 30 -i ./DSCF2021.AVI -vbsf dump_extra -f mpegts -acodec libmp3lame -ar 48000 -ab 64k -s 640x480 -vcodec libx264 -fflags +genpts -b 386k -coder 0 -me_range 16 -keyint_min 25 -i_qfactor 0.71 -bt 386k -maxrate 386k -bufsize 386k -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -aspect 640:480

  Then the output is segmented into ts segments using an open source segmenter.

  If both come from the same source (both from the camera) they work fine. However in this case, the second set of segments freeze. Time passes, but the video does not move..
  So i think it's an encoding problem. So my question is, how should i change the ffmpeg command for this to work ?

  By interleave I mean, having a playlist with the first set of segments, and another playlist with the other set of segments, and having the client call one then the other (HTTP Live Streaming)

  The ffprobe output of one of the first set of segments :

  Input #0, mpegts, from 'live1.ts':
  
    Duration: 00:00:09.76, start: 1.400000, bitrate: 281 kb/s
  
    Program 1 Service01
  
      Metadata:
  
        name            : Service01
  
        provider_name   : FFmpeg
  
      Stream #0.0[0x100]: Video: h264, yuv420p, 640x480 [PAR 1:1 DAR 4:3], 29.92 fps, 29.92 tbr, 90k tbn, 59.83 tbc
  
      Stream #0.1[0x101]: Audio: aac, 48000 Hz, stereo, s16, 111 kb/s

  The ffprobe output of one of the second set of segments :

  Input #0, mpegts, from 'ad1.ts':
  
    Duration: 00:00:09.64, start: 1.400000, bitrate: 578 kb/s
  
    Program 1 Service01
  
      Metadata:
  
        name            : Service01
  
        provider_name   : FFmpeg
  
      Stream #0.0[0x100]: Video: h264, yuv420p, 640x480 [PAR 1:1 DAR 4:3], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0.1[0x101]: Audio: aac, 48000 Hz, stereo, s16, 22 kb/s

  Thank you,

• Copy 3gp moov atom from one file to another

  1er août 2016, par message

  I was in Norway and I had an awesome time ; I recorded my ride on the sledges, and my HTC Sensation turned off when I finished my ride because my battery ran out.

  When I reached my laptop I found a 630 Mb video file my the phone, but I was not able to play it with VLC. Since I’m using Ubuntu, I tried to ffprobe my file and I received the following :

  [22:22 @ ~/Desktop] $ ffprobe VIDEO0002.3gp 
  
  FFprobe version 0.6-4:0.6-2ubuntu6.3, Copyright (c) 2007-2010 the FFmpeg developers
  
    built on Dec 21 2011 18:43:14 with gcc 4.4.5
  
    configuration: --extra-version=4:0.6-2ubuntu6.3 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-vaapi --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-gpl --enable-postproc --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
  
    libavutil     50.15. 1 / 50.15. 1
  
    libavcodec    52.72. 2 / 52.72. 2
  
    libavformat   52.64. 2 / 52.64. 2
  
    libavdevice   52. 2. 0 / 52. 2. 0
  
    libavfilter    1.19. 0 /  1.19. 0
  
    libswscale     0.11. 0 /  0.11. 0
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x8c3c010]moov atom not found
  
  VIDEO0002.3gp: Operation not permitted

  I had an idea that I might be able to use an older recorded video from my phone and simply copy the moov atom from that working file to the broken one. Any ideas about that ? How can I fix this problem ?

• Encode uncompressed avi from webcam

  17 août 2013, par shaun

  I have to record videos for a project I'm doing. Two of these are USB cameras and another is a n IP overhead camera.All three are connected to a laptop computer. After recording the videos I need to be able to open them in an editor (not for editing particularly but for modeling stuff in them for which I need a timeline). I have chosen Sony Vegas Pro for my editor. I have been able to record the uncompressed avi using gstreamer with this command :

  gst-launch v4l2src device=/dev/video0 ! 'video/x-rawyuv,width=640,height=480,framerate=10/1' ! mux. avimux name=mux ! filesink location=temp.avi

  I had to set the framerate to 10 because I was using two USB cameras and a framerate of 30 on both could not be accomodated in the bandwidth of the USB controller. I do not care about audio in my file so I don't grab audio. Similary, while encoding I wouldn't care about audio as well. This is raw uncompressed avi. I was not able to open this in Sony Vegas Pro. I believe I need to encode this uncompressed avi using a codec that will be opened by Sony Vegas Pro (I don't know which codecs Sony likes, so I'll probably try different ones until one of them opens).

  For encoding this video, I have several options : mencoder, ffmpeg, gstreamer. But I am not able to figure out how to use these tools to get what I want. Ideally, I would like just to sort of "insert" a codec with other settings remaining the same. I don't really care about the how much space the resulting video takes since the length of the videos are not going to be more than 3 minutes and I have space available, so lossless codecs also work. I believe Sony reads mpeg avi's so if I can get that, it'll be great.

  Thanks for reading and I appreciate all the help.