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• Write Live Photo metadata to video using FFMPEG

  13 août 2021, par Luke Burns

  According to Apple Live Photo file format, there are three pieces of metadata that need to be written for a JPEG and MOV to be accepted as a live photo. I can use exiftool and ffmpeg to write the necessary content identifier metadata.

  


  For the JPEG :

  


  exiftool -TagsFromFile reference.jpeg -makernotes -ContentIdentifier image.jpeg
exiftool -ContentIdentifier="$id" image.jpeg


  


  Similarly, ffmpeg can be used to write the top-level Quicktime metadata with matching id.

  


  However I'm having trouble with the timed metadata : ["com.apple.quicktime.still-image-time" : 0xFF].

  


  I can't even manage to produce a copy of an existing live photo MOV file using ffmpeg that preserves the necessary timed metadata.

  


  ffmpeg -i original.mov -map 0 -c copy -movflags use_metadata_tags copy.mov


  


  copies the global metadata (i.e. com.apple.quicktime.content.identifier), but loses the necessary still-image-time which can be confirmed using exiftool :

  


  > exiftool -G -U -ee original.mov | grep 'Still Image Time'
[QuickTime]     Still Image Time                : -1
> exiftool -G -U -ee copy.mov | grep 'Still Image Time'
> 


  


  How can I write the timed metadata using ffmpeg—specifically the still-image-time data ?

  


  Edit : it looks like this may be happening because ffmpeg does not know how to handle the mebx tag on data streams :

  


  [mov @ 0x7fb232091400] Unknown hldr_type for mebx, writing dummy values


  


  And ffmpeg doesn't seem to have a way to copy unknown streams. This appears to also be a problem for dealing with the fdsc tag in GoPro metadata streams (e.g. see https://gist.github.com/radimklaska/8974637522a751adb49db0de3be482c9#file-gopro_hevc_to_dnxhd-sh-L125), so it's often copied over as gpmd data, which ensures it's not overwritten with dummy values, but this trick doesn't work in the case of live photos mebx metadata.

  


• Live website to video

  25 janvier 2016, par Asaf Nevo

  I have a website which shows a slideshow of pictures using JS.

  The pictures objects are coming from a web service and are being updated from time to time.

  In few days, I doing a test with a potential client to present the pictures slideshow on his big LED screen.

  He’s using BSPlayer for the content on screen, an able to present a website, but it will never be a clean full screen (the X button and such will always be presents).

  He’s the most comfort with presenting a video rather than a website.

  One of my ideas of solutions was to check if there is a way to stream a content of a website.

  Googling it got me to a solution combined ImageMagic and FFMPEG which you can read about here

  My problem is that this solution only creates a slide show out of static pictures - which I can do, but i’m losing the dynamic part of my live slideshow.

  Is there a tool for capturing websites and converting them into a stream of videos ?

  Or maybe a workaround to achieve the same functionality ?

• Android - Exoplayer - Progressive live streaming - Mpeg2 - Audio issue

  1er août 2020, par Suresh

  Hi I have live stream URL ... When I tried to play with latest exoplayer version 2.11.4 .... Video is being played and audio is not playing ....

  


  type of the url is decided based on

  


  int type = Util.inferContentType(uri);

  


  and it is ProgressiveMediaSource

  


  i have no signs of audio log both

  


  debugViewHelper = new DebugTextViewHelper(player, this.debugTextView);
player.addAnalyticsListener(new EventLogger(trackSelector));


  


  but the url is played well in other players like VLC ...

  


  and i have checked with ffprobe it is having both audio and video stream ...