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• Concatenating Smooth Streaming output to a single MP4 file - problems with A/V sync. What is CodecPrivateData ?

  14 février 2021, par user15180344

  I have a video in fragmented form which is an output of an Azure Media Services Live Event (Smooth Streaming).

  


  I'm trying to concatenate the segments to get a single MP4 file, however I've run into a A/V sync problem - no matter what I do (time-shifting/speeding up/slowing down/using FFmpeg filters), the audio delay is always floating. To get the output MP4 file, I tried concatenating the segments for video and audio streams (both at OS file level and with FFmpeg) and then muxing with FFmpeg.

  


  I've tried everything I found on the web and I'm always ending up with exactly the same result. What's important, when I play the source from the manifest file, it's all good. That made me skim through the manifest once again, and I realized there's CodecPrivateData value which I'm not using anywhere in the process. What is it ? Could it somehow help solving my problem ?

  


• Bitmaps to video in C#

  9 septembre 2013, par user2754599

  DONE SO FAR

  I use AForge MJPEGStream to get bitmaps from different IPcams and display them in my app. Now I want to record multiple (like at least 8) of these bitmapstreams to the local HDD. I already used AForge AVIWriter (DLL) to write the file of 1 stream from a List, but because those Bitmaps all go in RAM I had to write it to HDD earlier (so I can record 8 streams at once). So I tried to write a frame every NewFrame-event to HDD. The problem with this is that AVIWriter.Open(string fileName, int width, int height) uses Win32.OpenFileMode.Create instead of Win32.OpenFileMode.ReadWrite and so deleting the videofile instead of opening it to add a frame.

  Preferred goal

  Record multiple MJPEG streams to disk as video files(could be done from the NewFrame-even described above, which provides Bitmaps). The very best result would be 1 hour long .MKV files encoded with X264. I don't care how to achieve this goal as long as it's done within my existing project in C# (so no need to keep using AForge).

• Cannot play H.264 stream using MSE

  8 juillet 2016, par lian

  I’m trying to stream H.264 data over websockets to a video element using MSE.

  I’m able to send and play a pre-recorded file, but when i try to create the data stream with the following command :

  ffmpeg -i rtsp://192.168.1.101/stream.264 -vcodec copy -an -f mp4 -reset_timestamps 1
-movflags empty_moov+default_base_moof+frag_keyframe -loglevel quiet -

  I get this in chromes media-internals :

  render_id: 215
player_id: 13
pipeline_state: kStopped
event: WEBMEDIAPLAYER_CREATED
url: blob:http%3A//127.0.0.1%3A8080/e468616d-5bde-47e0-8e59-1881ddb53abc
debug: ISO BMFF boxes that run to EOS are not supported
error: media::MediaSourceState::Append: stream parsing failed. Data size=727 append_window_start=0 append_window_end=inf
pipeline_error: chunk demuxer: append failed

  I think the problem has something to do with the debug line about ISO BMFF boxes, but have been unable to find any references to this message.