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• web recorded video not played in ipad

  30 juin 2015, par ketan

  I record video from web using flash media server. Now using flex default player i tried to play video but, it will not play ipad.(ios device)
  I checked that video codec and it is something like following :

  libxavs --enable-libxvid --enable-decklink --enable-zlib
  
    libavutil      52. 92.100 / 52. 92.100
  
    libavcodec     55. 69.100 / 55. 69.100
  
    libavformat    55. 45.100 / 55. 45.100
  
    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
  
  [flv @ 0000000002b60220] Stream discovered after head already parsed
  
  Input #0, flv, from 'C:\Users\Administrator\Desktop\123654789.flv':
  
    Metadata:
  
      canSeekToEnd    : false
  
      createdby       : FMS 4.5
  
      creationdate    : Tue Jun 30 16:27:22 2015
  
    Duration: 00:00:15.25, start: 0.000000, bitrate: 52 kb/s
  
      Stream #0:0: Video: flv1, yuv420p, 320x227, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: speex, 16000 Hz, mono, s16, 20 kb/s
  
      Stream #0:2: Data: none

  I record video following ways :

  netstream.publish("FILENAME","record");

  Thanks.

  Edit :

  Another flv file i got which is played in ios. But when i check it’s codec it something like following :

  r --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab -
  
  -enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
  
  --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-
  
  libxavs --enable-libxvid --enable-decklink --enable-zlib
  
    libavutil      52. 92.100 / 52. 92.100
  
    libavcodec     55. 69.100 / 55. 69.100
  
    libavformat    55. 45.100 / 55. 45.100
  
    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
  
  Input #0, flv, from 'C:\Users\Administrator\Desktop\16402.flv':
  
    Metadata:
  
      major_brand     : 3gp4
  
      minor_version   : 0
  
      compatible_brands: isom3gp4
  
      encoder         : Lavf55.45.100
  
    Duration: 00:00:13.23, start: 0.000000, bitrate: 304 kb/s
  
      Stream #0:0: Video: flv1, yuv420p, 320x240, 300 kb/s, 15 fps, 15 tbr, 1k tbn
  
  , 1k tbc
  
      Stream #0:1: Audio: mp3, 22050 Hz, mono, s16p, 0 kb/s

  How, can i record/convert flv like below ?

• Video has no audio when played using HTML5

  4 mai 2013, par vertigoelectric

  I have a media site where I can upload video files. After upload, they are converted to MP4 using ffmpeg and then ffmpeg2theora converts that to OGV.

  I have recently discovered that some videos that I upload do not play any sound when using the HTML5 player in Firefox/Chrome, but do have sound when using the fallback Flash player in IE.

  I've downloaded and checked the processed files and they both still have sound, so the issue seems to be related to the HTML5 player rather than loss of audio during processing.

  I double-checked my ffmpeg command line and realized I didn't specify any audio options :

  ffmpeg2 -i "inputfile" -vcodec libx264 -profile:v baseline -level 3 "outputfile" 2>&1'

  Since only some of the files didn't play audio while some did, this led me to believe that the audio track was being copied directly during the processing and if the original file didn't have audio supported by HTML5, then it output file would have the same result.

  I realized this means I have to force re-encoding of the audio stream, so I tried a few things but had no success with any.

  I tried 'libfaac' as many online posts suggested, but this resulted in an 'unknown codec' error. Further reading led me to find that 'libfaac' was no longer included with ffmpeg builds. I must have gotten mine after that.

  I tried the "Native AAC" codec by simply using the following options :

  ffmpeg2 -i "inputfile" -vcodec libx264 -profile:v baseline -level 3 -acodec aac "outputfile" 2>&1'

  With this I got the following error : "Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height".

  The only codec that didn't give me some sort of error was 'libvo_aacenc'. However, even though the processing completed without error, I still got no audio when played in the HTML5 player.

  What am I doing wrong ?

  NOTE (just in case this is relevant) : This is currently being run on a Windows host using the ffmpeg executable, but we will soon be moving to a Linux host.

• ffmpeg h.264 invalid cutting

  1er mai 2012, par E.Ar

  I have an s3 bucket with several hundreds video files.
  Those files were created by cutting parts of larger video files using ffmpeg.
  I wrote a script for this, which downloads the original video file from another bucket, runs ffmpeg to cut the file, and uploads the new file to it's bucket.
  For downloading and uploading from/to s3 i used this php library.
  The ffmpeg syntax I used :

  ffmpeg -y -vsync 2 -async 1 -ss [time-in] -t [duration] -i [large-input-video.mp4] -vcodec copy -acodec copy [short-output-video.mp4]

  Which should just cut the original file between the specified times, without any changes to the a/v codecs.
  All the original video files are encoded in h.264, and this is also the required encoding for the new files (which will be streamed through a CDN to the clients' flash players).

  My problem is that only a small part of the new files are coming out as encoded in h.264, but most of them aren't (h.264 is a must, otherwise the files wont play on the clients' side).
  I can't trace the problem to the original videos, since when i use the same ffmpeg command manually, with the same parameters and on the same files, the output files come out just fine. It seems arbitrary.

  I use ffprobe to get information about the files' codecs.
  For example :
  ffprobe of one of the large (original) video files :

  ...
  Stream #0.0(und) : Video : h264, yuv420p, 640x352, 499 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
  ...

  ffprobe of the corresponding new cut file :

  ...
  Stream #0.0(und) : Video : mpeg4, yuv420p, 640x352 [PAR 1:1 DAR 20:11], 227 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
  ...

  As can be seen, the difference is in 'mpeg4' vs. 'h264'.

  Any insights on what can cause the new files to come out in the wrong encoding would be greatly appreciated.

  Thanks !

  Edit : Problem Resolved
  After analyzing all the files, I noticed that about two thirds of them are coming out in the wrong codec.
  Since I used three machines for the cutting process (three separate EC2 servers), it occurred to me that on two of them there is a bad installation of ffmpeg (as @LordNeckbeard suggested in his answer).
  I ran the process again, only on the invalid files, on the third machine alone - which produced the desired result.