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• Issue while opening a .mp4 file - CPU shoots up 100%

  16 juillet 2014, par AnilJ

  I am using IMediaWriter, to write out about 20 video frames into an independent .mp4 file and creating a new writer to write a new file. This is a logic (not so efficient one), I’ve used to chunk the web-cam feed into chunks. I am able to successfully able to create multiple .mp4 video files and when opened then in a VLC player, they can be played back.

  However, when I try to open one of the chunked file into a new IContainer object (see below code snippet), my program :

  • Gets stuck at the container.open() call ( see * below), and the CPU
    utilization shoots above 100%.
  • Sometimes it throws an error "moov atom not found", and hence can not open the file.

  In both the cases, my program does not work.

  <code snippet="snippet">
  
          String file = BASE_PATH + File.separator + "output" + File.separator + "output.mp4";  // This is one of the chunk.
  
          IContainer container = IContainer.make();
  
          FileChannel channel = null;
  
  
  
          try {
  
              @SuppressWarnings("resource")
  
              RandomAccessFile inFile = new RandomAccessFile(chunkFile, "r");
  
              channel = inFile.getChannel();
  
          } catch (FileNotFoundException e) {
  
              e.printStackTrace();
  
          }
  
  
  
          // Open up the container
  
  ***        int retval = container.open(channel, IContainer.Type.READ, null);
  
          if (retval &lt; 0) {
  
              // This little trick converts the non friendly integer return value into 
  
              // a slightly more friendly object to get a human-readable error name
  
              IError error = IError.make(retval);
  
              throw new IllegalArgumentException("could not open file: " + mInputFileChannel + "; Error: " + error.getDescription());
  
          }
  
  <code snippet="snippet">
  
  

  Subsequently, I ran the AtomicParsley tool to dump the file content, and it prints following. I am not aware of video file internals and seeking help to know the issue here and potential solution.

  Atom ftyp @ 0 of size: 28, ends @ 28
  
  Atom free @ 28 of size: 8, ends @ 36
  
  Atom mdat @ 36 of size: 45175, ends @ 45211
  
  Atom moov @ 45211 of size: 1052, ends @ 46263
  
       Atom mvhd @ 45219 of size: 108, ends @ 45327
  
       Atom trak @ 45327 of size: 839, ends @ 46166
  
           Atom tkhd @ 45335 of size: 92, ends @ 45427
  
           Atom edts @ 45427 of size: 36, ends @ 45463
  
               Atom elst @ 45435 of size: 28, ends @ 45463
  
           Atom mdia @ 45463 of size: 703, ends @ 46166
  
               Atom mdhd @ 45471 of size: 32, ends @ 45503
  
               Atom hdlr @ 45503 of size: 45, ends @ 45548
  
               Atom minf @ 45548 of size: 618, ends @ 46166
  
                   Atom vmhd @ 45556 of size: 20, ends @ 45576
  
                   Atom dinf @ 45576 of size: 36, ends @ 45612
  
                       Atom dref @ 45584 of size: 28, ends @ 45612
  
                           Atom url  @ 45600 of size: 12, ends @ 45612
  
                   Atom stbl @ 45612 of size: 554, ends @ 46166
  
                       Atom stsd @ 45620 of size: 198, ends @ 45818
  
                           Atom mp4v @ 45636 of size: 182, ends @ 45818
  
                               Atom esds @ 45722 of size: 96, ends @ 45818
  
                       Atom stts @ 45818 of size: 176, ends @ 45994
  
                       Atom stss @ 45994 of size: 24, ends @ 46018
  
                       Atom stsc @ 46018 of size: 28, ends @ 46046
  
                       Atom stsz @ 46046 of size: 100, ends @ 46146
  
                       Atom stco @ 46146 of size: 20, ends @ 46166
  
       Atom udta @ 46166 of size: 97, ends @ 46263
  
           Atom meta @ 46174 of size: 89, ends @ 46263
  
               Atom hdlr @ 46186 of size: 33, ends @ 46219
  
               Atom ilst @ 46219 of size: 44, ends @ 46263
  
                   Atom ©too @ 46227 of size: 36, ends @ 46263
  
                       Atom data @ 46235 of size: 28, ends @ 46263
  
  ------------------------------------------------------
  
  Total size: 46263 bytes; 31 atoms total. AtomicParsley from svn built on Jul 15 2014 (utf8)
  
  Media data: 45175 bytes; 1088 bytes all other atoms (2.352% atom overhead).
  
  Total free atom space: 8 bytes; 0.017% waste.
  
  ------------------------------------------------------

  I am not sure if there is anything wrong with the file itself. Can you please help me understand this ?

• merge audio stream with video

  16 juillet 2014, par Ranjith KR

  I have a video file with a video and audio stream on it (6.flv)
  I need to merge an audio with with the video file that is already having an audio.
  But I am getting an error "Could not write header for output file #0 (incorrect codec parameters ?) : Invalid argument"

  # ffmpeg -i 6.flv 
  
  Stream #0:0: Video: flv1, yuv420p, 426x240, 279 kb/s, 23.98 fps, 23.98 tbr, 1k tbn, 1k tbc
  
  Stream #0:1: Audio: mp3, 22050 Hz, stereo, s16p, 65 kb/s[/color]
  
  
  
  And an audio mp3 file(2.mp3). 
  
  
  
  # ffmpeg -i 2.mp3
  
  Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
  
  
  
  And i need to mix (add) this mp3 file to the video file. So inshort the new video file should have two audio streams from video and mp3. I am trying to do this with the below command 
  
  
  
  # ffmpeg -i 6.flv -i 2.mp3 -map 0:0 -map 0:1 -map 1:0 -codec copy -shortest output_video.flv
  
  
  
  But I am getting the following error , Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument . Any idea how to fix this?
  
  
  
  Please find the complete command output. I am trying to run this on a centos machine. 
  
  
  
  ]# ffmpeg -i 6.flv -i 2.mp3 -map 0:0 -map 0:1 -map 1:0 -codec copy -shortest output_video.flv
  
  ffmpeg version N-64525-g7cb8f7d Copyright (c) 2000-2014 the FFmpeg developers
  
  built on Jul 8 2014 23:41:20 with gcc 4.1.2 (GCC) 20080704 (Red Hat 4.1.2-54)
  
  
  
  purl :
  
  pmsg :
  
  encoder : Lavf55.45.100
  
  Stream #0:0: Video: flv1 ([2][0][0][0] / 0x0002), yuv420p, 426x240, q=2-31, 279 kb/s, 23.98 fps, 1k tbn, 1k tbc
  
  Stream #0:1: Audio: mp3 ([2][0][0][0] / 0x0002), 22050 Hz, stereo, 65 kb/s
  
  Stream #0:2: Audio: mp3 ([2][0][0][0] / 0x0002), 44100 Hz, stereo, 128 kb/s
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (copy)
  
  Stream #0:1 -> #0:1 (copy)
  
  Stream #1:0 -> #0:2 (copy)
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument

• FFmpeg : NetStream.Play.StreamNotFound on RMTP stream

  22 juillet 2014, par user2957378

  I want to take snapshots periodically of a RTMP live video stream.
  I can see the rtmp video stream using VLC. This is the rtmp url :

  rtmp://antena3fms35livefs.fplive.net/antena3fms35live-live/stream-antena3_1

  I’m using the following command to capture the snapshots, according to the official FFmpeg site here :

  ffmpeg -i rtmp://antena3fms35livefs.fplive.net/antena3fms35live-live/stream-antena3_1 -f image2 -vf fps=fps=1 out%d.png

  The command produces the following output :

  ffmpeg version N-64667-gd595361 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Jul 14 2014 22:09:48 with gcc 4.8.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzl
  
  libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amr
  
  enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --ena
  
    libavutil      52. 92.100 / 52. 92.100
  
    libavcodec     55. 69.100 / 55. 69.100
  
    libavformat    55. 47.100 / 55. 47.100
  
    libavdevice    55. 13.102 / 55. 13.102
  
    libavfilter     4. 10.100 /  4. 10.100
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 19.100 /  0. 19.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  HandShake: client signature does not match!
  
  Closing connection: NetStream.Play.StreamNotFound
  
  rtmp://antena3fms35livefs.fplive.net/antena3fms35live-live/stream-antena3_1: Unknown error occurred

  I’ve tried it with another rmtp streams, but I’m still getting the exact same error.

  What could be the problem ?
  Thank you !