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• avformat/dashdec : add dash demuxer base version

  9 septembre 2017, par Steven Liu

  avformat/dashdec : add dash demuxer base version
  ffmpeg need a dash demuxer for demux the dash formats base on
  
  https://github.com/samsamsam-iptvplayer/exteplayer3/blob/master/tmp/ffmpeg/patches/3.2.2/000001_add_dash_demux.patch
  TODO :
  
  1. support multi bitrate dash.
  v2 fixed :
  
  1. from autodetect to disabled
  
  2. from camelCase code style to ffmpeg code style
  
  3. from RepType to AVMediaType
  
  4. fix variable typo
  
  5. change time value from uint32_t to uint64_t
  
  6. removed be used once API
  
  7. change 'time(NULL)`, except it is not 2038-safe.' to av_gettime and av_timegm
  
  8. merge complex free operation to free_fragment
  
  9. use API from snprintf to av_asprintf
  v3 fixed :
  
  1. fix typo from —enabled-xml2 to —enable-xml2
  v4 fixed :
  
  1. from —enable-xml2 to —enable-libxml2
  
  2. move system includes to top
  
  3. remove nouse includes
  
  4. rename enum name
  
  5. add a trailing comma for the last entry enum
  
  6. fix comment typo
  
  7. add const to DASHContext class front
  
  8. check sscanf if return arguments and give warning message when error
  
  9. check validity before free seg->url and seg
  
  10. check if the val is null, before use atoll
  v5 fixed :
  
  1. fix typo from mainifest to manifest
  v6 fixed :
  
  1. from realloc to av_realloc
  
  2. from free to av_free
  v7 fixed :
  
  1. remove the -lxml2 from configure when require_pkg_config
  v8 fixed :
  
  1. fix replace filename template by av_asprintf secure problem
  v9 modified :
  
  1. make manifest parser clearly
  v10 fixed :
  
  1. fix function API name code style
  
  2. remove redundant strreplace call
  
  3. remove redundant memory operation and check return value from get_content_url()
  
  4. add space between ) and 
  
  5. remove no need to log the value for print
  
  v11 fixed :
  
  1. from atoll to strtoll
  
  Suggested-by : Michael Niedermayer <michael@niedermayer.cc>
  v12 fixed :
  
  1. remove strreplace and instead by av_strreplace
  
  Suggested-by : Nicolas George <george@nsup.org>
  v13 fixed :
  
  1. fix bug : cannot play :
  
  http://dash.edgesuite.net/akamai/bbb_30fps/bbb_30fps.mpd
  
  Reported-by : Andy Furniss <adf.lists@gmail.com>
  v14 fixed :
  
  1. fix bug : TLS connection was non-properly terminated
  
  2. fix bug : No trailing CRLF found in HTTP header
  
  Reported-by : Andy Furniss <adf.lists@gmail.com>
  v15 fixed :
  
  1. play youtube link : ffmpeg -i $(youtube-dl -J "https://www.youtube.com/watch?v=XmL19DOP_Ls" ; | jq -r ".requested_formats[0].manifest_url")
  
  2. code refine for timeline living stream
  
  Reported-by : Ricardo Constantino <wiiaboo@gmail.com>
  v16 fixed :
  
  1. remove the snprintf and instead by get_segment_filename make safety
  
  2. remove unnecessary loops
  
  3. updated xmlStrcmp and xmlFree to av_* functions
  
  4. merge code repeat into one function
  
  5. add memory alloc faild check
  
  6. update update_init_section and open_url
  
  7. output safety error message when filename template not safe
  
  Suggested-by : wm4 <nfxjfg@googlemail.com>
  v17 fixed :
  
  1. add memory alloc faild check
  
  2. fix resource space error at free_representation
  v18 fixed :
  
  1. add condition of template format
  v19 fixed :
  
  1. fix typo of the option describe
  v20 fixed :
  
  1. add the c->base_url alloc check
  
  2. make the DASHTmplId same to dashenc
  v21 fixed :
  
  1. remove get_repl_pattern_and_format and get_segment_filename
  
  2. process use dashcomm APIs
  v22 fixed :
  
  1. modify the include "dashcomm.h" to include "dash.h"
  
  2. use internal API from dash_fill_tmpl_params to ff_dash_fill_tmpl_params
  Signed-off-by : Steven Liu <lq@onvideo.cn>
  
  Signed-off-by : samsamsam <samsamsam@o2.pl>
  

  • [DH] configure
  • [DH] libavformat/Makefile
  • [DH] libavformat/allformats.c
  • [DH] libavformat/dashdec.c

• FFMPEG segment live video for DASH

  23 décembre 2014, par static

  I’m trying to stream live capture of desktop to my own server, which shall create an MPD with segment template for use with dash.js player.
  Using the following command i managed to get it working
  

  ffmpeg -rtbufsize 6M -f x11grab -s 1366x768 -r 10 -i :0.0 -flags +global_header \
  
  -vcodec libvpx -deadline realtime -profile:v 0 -keyint_min 1 -g 1 -cpu-used 0 \
  
  -vb 1200k -qmin 10 -qmax 42 -threads 4 -bufsize 6000k -slices 4 -map 0 -an \
  
  -f stream_segment -segment_time 2 -segment_format webm **/streams

  The output :

  Input #0, x11grab, from ':0.0': Duration: N/A, start: 1419329032.549498, bitrate: N/A
  
  Stream #0:0: Video: rawvideo (BGRA / 0x41524742), bgra, 1366x768, 10 fps, 10 tbr, 1000k tbn, 10 tbc
  
  [libvpx@ 0x23ccf60] v1.3.0 Output #0, stream_segment, ssegment, to /streams/d':
  
  Metadata:
  
  encoder : Lavf56.15.102
  
  Stream #0:0: Video: vp8 (libvpx), yuva420p, 1366x768, q=10-42, 1200 kb/s, 10 fps, 1k tbn, 10 tbc
  
  Metadata: encoder: Lavc56.13.100 libvpx
  
  Stream mapping: Stream #0:0 -> #0:0 (rawvideo (native) -> vp8 (libvpx))
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 0x23ac0c0] Warning: data is not aligned! This can lead to a speedloss
  
  frame= 2839 fps= 10 q=0.0 Lsize=N/A time=00:04:43.90 bitrate=N/A
  
  video:135246kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

  If I increase the number of frames to produce better quality, the latency drastically increases and the stream is not in sync with the MPD. This is caused by the fact that keyframes are created at every frame -keyint_min 1 -g 1 because otherwise and error MEDIA_ERR_SRC_NOT_SUPPORTED is thrown by the player. This is probably because a keyframe must be found at the beginning of each segment.

  Could ffmpeg be used to generate keyframes as the first frame in each segment ? I try different values for -keyint_min x -g y, for example number of frames but with no result (probably because the number of frames stabilized after a couple a seconds, so the first 2-3 segments were produced with inconsistent number of frames, so all the keyframes were introduced in wrong positions in the segments).

• Rails 5 with Carrierwave and S3 - creating multiple video formats for DASH streaming works but mpd file breaks

  22 novembre 2019, par Milind

  what I am doing -
  i have a Rails 5 app for video streaming(DASH MPEG) that uses FFMPEG to get encoded stream videos by converting any single video into multiple videos of multiple bit rates/size and primarily also MPD FILE that can be played easily on html video player, which i have already tested by manually running the ffmpeg scripts on the console that generates all the files.However, I want to automate this process and hence carrierwave comes into the pictures.
  Here, i use carrierwave to generate different versions(size/bitrate) of videos(mp4/webm) to upload to s3 but during running the version, where all the versions are successfully created in tmp folder, only the last version(mpd) that needs to create .mpd file, carrierwave creates a mp4 video file and just replaces the extension instead of actually creating the mpd file.

  So in the aws s3(screenshot added below), i can see my all versions and mpd file , but that mpd file which must be xml file is actually a mp4 video file or uploaded version file itself.
  I have also tried to create new file during the process, but it never works.
  Has some one encountered this problem ?

  any help will be greatly appreciated ?

  Ny code snippets below - model,uploader,output of script on the console during upload, s3 screenshot

     ##### models/video.rb ##########
  
  
  
      mount_uploader :video, VideoUploader  
  
  
  
     ####### uploaders/video_uploader.rb #########
  
  
  
      class VideoUploader < CarrierWave::Uploader::Base
  
  
  
  
  
      include CarrierWave::MiniMagick
  
      include CarrierWave::Video
  
      include CarrierWave::Video::Thumbnailer
  
      include ::CarrierWave::Backgrounder::Delay
  
  
  
      ####### for streaming ..first get the audio and then convert the input video into multiple bitrates/scale #######
  
  
  
      ###first get audio and then get all different versions of same video
  
      version :video_audio do
  
        process :get_audio
  
  
  
        def get_audio
  
          `ffmpeg -y -i "#{file.path}" -c:a aac -ac 2 -ab 128k -vn video_audio.mp4`
  
        end
  
  
  
          def full_filename(for_file)
  
            "video_audio.mp4"
  
          end
  
  
  
          def filename
  
            "video_audio.mp4"
  
          end        
  
      end 
  
  
  
      ####### similar to the above i have various version like ...#########
  
  
  
      version :video_1080 do...end
  
      version :video_720 do... end
  
      version :video_480 do ...end
  
      ...and so on..and all these versions are successfully created and uploaded to s3, however..in next version ...show it also creates a video file whereas i need a simple mpd file ONLY.
  
  
  
           ###this is where even after everything works, in S3, i can see a video file of version mpd and not actual mpd file
  
           version :mpd  do
  
             process :get_manifest
  
                ###here in the command below, the video.mpd file is successfully obtained but its uploaded as video.mpd file of added/uploaded video file and not a new mpd file
  
                ###tried with ffmpeg -f webm_dash_manifest -i too, but s3 still shows a mp4 file
  
                `MP4Box -dash 1000 -rap -frag-rap -profile onDemand -out video.mpd video_1080.mp4 video_720.mp4 video_480.mp4 video_360.mp4 video_240.mp4 video_audio.mp4 `
  
  
  
             end
  
            end
  
  
  
           ######### sidekiq console output - successful mpd is generated ################
  
                DASH-ing files - single segment
  
                Subsegment duration 1.000 - Fragment duration: 1.000 secs
  
                Splitting segments and fragments at GOP boundaries
  
                DASHing file video_1080.mp4
  
                DASHing file video_720.mp4                                  
  
                DASHing file video_480.mp4                                  
  
                DASHing file video_360.mp4                                  
  
                DASHing file video_240.mp4                                  
  
                DASHing file video_audio.mp4                                
  
               \[DASH\] Generating MPD at time 2019-11-22T00:01:59.872Z      
  
                mpd_1mb.mp4
  
                mpd_video.mpd

  this is what the uploaded files looks on s3, notice the video.mpd, its a mp4 video file just like others which should have been a simple mpd file of not more than 2kb.

  Is there something that I am missing ?
  Can Carrierwave do this or is it not made for this ?
  Do I have to write a callback and then programmatically upload files to s3, if carrierwave is not helping in this regard ?

  Kindly provide any suggestion or useful advice so that I can move ahead.