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• Replacing one segment of fragmented mp4

  24 mai 2023, par Stsh4lson

  I created mpeg-dash stream with fragmented mp4 stream with init.m4a and .m4s segments using following command :

  


  ffmpeg -i $1 -c:v h264_nvenc -c:a aac -g 100 \
    -sc_threshold 0 -reset_timestamps 1 -an -map v:0 -s:0 1920x1080 \
    -profile:v baseline -level:v 5.0 -streaming 1 \
    -s:1 1920x1080 -use_template 1 -use_timeline 0 \
    -seg_duration 4 -frag_duration 1 -frag_type duration -pix_fmt yuv420p \
    -f dash $2


  


  I also generated second mpeg-dash vod with same ffmpeg command and i want to replace some segments in the first video with segments form second video.
When i just replace segments manually the video is frozen at that segment.

  


  Additionally when i replace segments that are in the same timestamp, i replace segment no.1 with segment no.1 etc. everything works fine.
Segments that are replaces with different segments from the same videos are also freezing.

  


  And when i do cat init_stream0.m4s chunk_segment0001.m4s chunk_segment0003.m4s > combined.mp4, constructed video has 12 seconds in player with missing video from 4s to 8s.

  


  I suspect that there is some timeline information in segments but i can find no information about structure of those m4s segments, and h264 has suposedly no timeline information.

  


  Do .m4s fragments in mpeg-dash have some internal timestamp information, and can i overwrite/replace this timestamp info ?

  


• Stream from MP4 file over RTSP with ffserver

  25 octobre 2019, par sirlion

  I’m trying to stream a mp4 file over RTSP using ffserver with no luck so far. I just want to stream directly from the file, without feeding from ffmpeg (no transcoding involved). But I’ve made it work with mpg video.

  Here is my ffserver config file :

  Port 8090
  
  BindAddress 0.0.0.0
  
  MaxHTTPConnections 2000
  
  MaxClients 1000
  
  MaxBandwidth 500000
  
  CustomLog -
  
  NoDaemon
  
  
  
  RTSPPort 7654
  
  RTSPBindAddress 0.0.0.0
  
  
  
  <stream>
  
      Format rtp
  
      File "/home/g/video_streaming/sample3-mpeg2.mpg"
  
  </stream>
  
  <stream>
  
      Format rtp
  
      File "/home/g/video.mp4"
  
  </stream>

  When I launch ffserver, everything seems fine based on the log output :

  $ ./dev/ffmpeg/ffserver -f ffserver-sample.conf
  
  ffserver version N-45673-gd0c27e8 Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Oct 18 2012 10:36:52 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration:
  
    libavutil      51. 76.100 / 51. 76.100
  
    libavcodec     54. 66.100 / 54. 66.100
  
    libavformat    54. 33.100 / 54. 33.100
  
    libavdevice    54.  3.100 / 54.  3.100
  
    libavfilter     3. 19.103 /  3. 19.103
  
    libswscale      2.  1.101 /  2.  1.101
  
    libswresample   0. 16.100 /  0. 16.100
  
  Thu Oct 18 11:54:22 2012 Opening file '/home/g/video.mp4'
  
  Thu Oct 18 11:54:22 2012 Opening file '/home/g/video.mp4'
  
  Thu Oct 18 11:54:23 2012 Opening file '/home/g/video_streaming/sample3-mpeg2.mpg'
  
  Thu Oct 18 11:54:23 2012 [mpeg @ 0x1dae3c0]max_analyze_duration 5000000 reached at 5005000
  
  Thu Oct 18 11:54:23 2012 Opening file '/home/g/video_streaming/sample3-mpeg2.mpg'
  
  Thu Oct 18 11:54:23 2012 [mpeg @ 0x1dae3c0]max_analyze_duration 5000000 reached at 5005000
  
  Thu Oct 18 11:54:23 2012 FFserver started.

  Finally, if I run ffplay in order to test the server, everything works fine for the mpg file, but not for the mp4 :

  $ ffplay rtsp://192.168.1.99:7654/test2-rtsp
  
  ffplay version N-45656-g916352f Copyright (c) 2003-2012 the FFmpeg developers
  
    built on Oct 17 2012 16:14:14 with gcc 4.4.5 (Ubuntu/Linaro 4.4.4-14ubuntu5.1)
  
    configuration:
  
    libavutil      51. 76.100 / 51. 76.100
  
    libavcodec     54. 66.100 / 54. 66.100
  
    libavformat    54. 33.100 / 54. 33.100
  
    libavdevice    54.  3.100 / 54.  3.100
  
    libavfilter     3. 19.103 /  3. 19.103
  
    libswscale      2.  1.101 /  2.  1.101
  
    libswresample   0. 16.100 /  0. 16.100
  
  rtsp://192.168.1.99:7654/test2-rtsp: Invalid data found when processing input
  
  
  
  Server's output:
  
  
  
  Thu Oct 18 11:57:51 2012 FFserver started.
  
  Thu Oct 18 11:58:01 2012 192.168.1.101 - - [DESCRIBE] "rtsp://192.168.1.99:7654/test2-rtsp RTSP/1.0" 200 167
  
  Segmentation fault (core dumped)

  I don’t really know what I could be missing. I’ve just read in the official doc that streaming from a file is kind of broken. Since I don’t really know if that’s up to date, I decided to give it a try here.

  Any help or suggestions ? Alternatives ?

• Unable to play webM file on chromium with Media Source Extensions. Works in firefox and vlc

  23 octobre 2018, par raul

  I’m currently trying to implement a video player using Media Source Extensions. Currently just a very simple proof of concept, following a tutorial I found here.

  I cloned their repo with all source code from github here and am testing the implementation on Chromium and Firefox with various video files.

  Everything worked well with the example webm files in the repo for both browsers.

  Next I tried to convert a video I downloaded from some random site using ffmpeg and mse-tools to "align the clusters" of the webm file using the following commands :

  ffmpeg -i randomvideo.mp4 -c:v libvpx -c:a libvorbis output.webm
  
  mse_webm_remuxer output.webm aligned.webm

  Again, all was well on both browsers.

  Finally, I wanted to convert a very simple animation I created in blender (rendered with h264 in mp4).

  I tried converting the resulting file using the same process as above and the file played normally on firefox, but did not load on chromium.

  I assume I am commiting some error when converting the file, but inspecting the attributes of the final file with vlc and ffprobe, I could not find any obvious problems.

  Any ideas as to what I am doing wrong ?

  One final test I did was to go to this site to get some sample webm files.

  I downloaded the "Big Buck Bunny Trailer in WebM" and "Elephants Dream as WebM File".

  Both files worked in firefox, but the "Elephants Dream" file would not play in chromium.

  I am on a linux machine (Arch Linux distro) with the following versions of the browsers :

  Chromium Version 69.0.3497.100 (Official Build) Arch Linux (64-bit)

  Firefox 62.0.3 (64-bit)

  I have shared the file I created from the blender animation (very small - only 36 KB) on google drive here in case anyone wants to check it out.