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• avcodec/h26[45]_metadata_bsf : Use separate contexts for reading/writing

  6 juillet 2020, par Andreas Rheinhardt

  avcodec/h26[45]_metadata_bsf : Use separate contexts for reading/writing
  Currently, both bsfs used the same CodedBitstreamContext for reading and
  
  writing ; as a consequence, the state of the writer's context at the
  
  beginning of writing a fragment is exactly the state of the reader after
  
  having read the fragment ; in particular, the writer might not have
  
  encountered one of its active parameter sets yet.
  This is not nice and may lead to invalid output even when the input
  
  is completely spec-compliant : Think of an access unit containing
  
  a primary coded picture referencing a PPS with id id (that is known from
  
  an earlier access unit/from extradata), then a new version of the PPS
  
  with id id and then a redundant coded picture that is also referencing
  
  the PPS with id id. This is spec-compliant, as the standard allows to
  
  overwrite a PPS with a different PPS in between coded pictures and not
  
  only at the beginning of an access unit. In this scenario, the reader
  
  would read the primary coded picture with the old PPS and the redundant
  
  coded picture with the new PPS (as it should) ; yet the writer would
  
  write both with the new PPS as extradata which might lead to errors or
  
  to invalid data being output without any error (e.g. if the two PPS
  
  differed in redundant_pic_cnt_present_flag).
  The above scenario does not directly translate to HEVC as long as one
  
  restricts oneself to input with nuh_layer_id == 0 only (as cbs_h265
  
  does : it currently strips away any NAL unit with nuh_layer_id > 0 when
  
  decomposing) ; if one doesn't the same issue as above can happen.
  If one also allowed input packets to contain more than one access unit,
  
  issues like the above can happen even without redundant coded
  
  pictures/multiple layers.
  Therefore this commit uses separate contexts for reader and writer.
  Reviewed-by : Mark Thompson <sw@jkqxz.net>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavcodec/h264_metadata_bsf.c
  • [DH] libavcodec/h265_metadata_bsf.c

• ffmpeg not converting mp3 to mp4 in flutter [duplicate]

  25 août 2020, par neena

  final String path = await _localPath ;
final Directory directory = await Directory('$path/CapturedImages').create(recursive : true) ;
print("The directory $directory is created") ;

  


    //print("Tempath::::::::::::::::: == $tempPath");
  String input = directory.path + '/' + "audio" + '.mp3';
  String output = directory.path   + "name" + ".mp4";
  final FlutterFFmpeg _flutterFFmpeg = new FlutterFFmpeg();
  _flutterFFmpeg.execute("ffmpeg -i $input $output").then((rc) => print("FFmpeg process exited with rc $rc"));

 Input #0, mp3, from '/storage/emulated/0/Android/data/quadauq.ffmpeg_examplebyneena/files/CapturedImages/audio.mp3':
I/mobile-ffmpeg(10080):   Metadata:
I/mobile-ffmpeg(10080):     genre           : 
I/mobile-ffmpeg(10080): Cinematic
I/mobile-ffmpeg(10080): 
I/mobile-ffmpeg(10080):     album           : 
I/mobile-ffmpeg(10080): YouTube Audio Library
I/mobile-ffmpeg(10080): 
I/mobile-ffmpeg(10080):     title           : 
I/mobile-ffmpeg(10080): Impact Moderato
I/mobile-ffmpeg(10080): 
I/mobile-ffmpeg(10080):     artist          : 
I/mobile-ffmpeg(10080): Kevin MacLeod
I/mobile-ffmpeg(10080): 
I/mobile-ffmpeg(10080):   Duration: 
I/mobile-ffmpeg(10080): 00:00:27.25
I/mobile-ffmpeg(10080): , start: 
I/mobile-ffmpeg(10080): 0.034531
I/mobile-ffmpeg(10080): , bitrate: 
I/mobile-ffmpeg(10080): 224 kb/s
I/mobile-ffmpeg(10080): 
I/mobile-ffmpeg(10080):     Stream #0:0
I/mobile-ffmpeg(10080): : Audio: mp3, 32000 Hz, stereo, fltp, 224 kb/s
I/mobile-ffmpeg(10080): 
I/mobile-ffmpeg(10080):     Metadata:
I/mobile-ffmpeg(10080):       encoder         : 
I/mobile-ffmpeg(10080): LAME3.99r
I/mobile-ffmpeg(10080): 
E/mobile-ffmpeg(10080): [NULL @ 0xec3b0800] Unable to find a suitable output format for 'ffmpeg'
E/mobile-ffmpeg(10080): ffmpeg: Invalid argument
I/flutter (10080): FFmpeg process exited with rc 1


  


  This is the log. The mp3 is reading but not converting to mp4 can anyone please help ?

  


• stream videos in html page from different servers [on hold]

  24 février 2016, par Aira

  I`m very new in programming(to be honest, I just know HTML !). So, maybe my question is little basic.
  I want to stream 3 differents videos in my HTML page. I know how to stream video from file or URL link in a HTML.The scenario is : I have Ubuntu server(I just know the IP of servers) and I want to stream a video from server1(with its specific IP) and Server2 and so on..So How can I do that ? or just help me to find a tutorial for this issue.
  Another question is, is that possible to run bash file in the html ? is there any specific script for it ? I want to write bash file into the servers to do some ffmpeg command, like mixing to videos and then put the result in another folder.I mean, when end user clicking on the bottom then request enable bash file on the server.

  I really appreciate your help