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• avformat/matroskaenc : Don't check twice whether to write tags

  15 juin 2022, par Andreas Rheinhardt

  avformat/matroskaenc : Don't check twice whether to write tags
  Because not all metadata is written as tags, the Matroska muxer
  
  filters out the tags that are not written as tags.
  
  Therefore the code first checks whether a Tag master element
  
  needs to be opened for a given stream/chapter/attachment/global
  
  metadata. If the answer turns out to be yes, it is checked again
  
  whether a given AVDictionaryEntry is written as a tag.
  
  This commit changes this : The Tag element is opened unconditionally
  
  and in case it turns out that it was unneeded, it is discarded again.
  
  This is possible because the Tag element is written into its own
  
  dynamic buffer.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavformat/matroskaenc.c

• Android : mp4 file plays when downloaded but when choosing "Video" player gets "Cannot play video"

  11 juillet 2019, par gview

  I’ve converted the video to an mp4 with ffmpeg using the h264 codec and AAC, and used the baseline profile.

  Videos are 540x360x250kbps

  I then ran qt-faststart on the file to move the atoms into the right order.

  I’ve stuck the file up on a wiki we use and created a link to it.

  My test phone is a Samsung Galaxy S3.

  When I browse to the page that has links to the mp4’s on it, and I click on them, I get a popup window with 2 options : Internet and Video.

  If I download the videos using the "Internet" option, I can play them on the phone without issue.

  I’ve done other encodings with the main profile as well, and these also play fine. I thought that a powerful phone like the s3 would be able to handle the more advanced compression schemes available in h264, however I’ve also browsed the Android docs in regards to supported video formats, and it seems to state that only the "baseline" compression profile is supported.

  Regardless, what doesn’t work is trying to use the "Video" option which I assume tries to stream the video.

  For the wiki in question, clicking on the link reveals that the content-type and content-length headers are being set :

  Content-Length  6175996
  
  Content-Type    video/mp4;charset=UTF-8

  Clicking on the link with a browser invokes a player (Quicktime in most cases) that can play the mp4’s.

  Is there more to having the file HTTP streamable beyond making a link to it ? Why won’t my Android 4 play these files ?

  UPDATE :
  I decided to make a quick HTML5 page using the video tag, and the videos do play on both my Galaxy S3 and the latest IOS.

• How to use x264 source code after compiling it

  8 mai 2016, par Zia Khattak

  I need to use the x264 code to compress and stream video from a camera in real time as part of my university project (first using computer and then dsp kit) (and vary quantization value when required). I am totally new to this domain and have absolutely no background.

  So far I have compiled the code using the given method in http://www.ayobamiadewole.com/Blog/How-to-build-x264-or-libx264.dll-in-Windows and created the x264.exe and libx264.dll

  I need help with what to do next in order to use the code for my purpose.

  All help is appreciated.