Recherche avancée

Sur d’autres sites (5920)

• How to get Base64 Output ?

  14 avril 2020, par Ahmet Biçer

  I am using react-native-ffmpeg library to get frames from a video file with this code ;

  



  RNFFmpeg.execute(`-ss 00:00:03 -to 00:00:04 -i input.mp4 -vf fps=1 ${RNFS.PicturesDirectoryPath}/out%05d.png`)


  



  This works as expected, saves the frames to given file but i need to render the frames before saving to the file system. So i thought i can use base64 encoding to get the image without saving. But i couldn't find any solution for this. Do you guys have any idea about solving this problem. If there is another solution rather than base64 encoding for getting the images before saving to filesystem i will happy to see that too. Thanks !

  



  Edit :
There is a function called av_base64_decode in the documentation but i don't know how to use with my code.

  



  Edit : I read about piping the output but i can't find anything base64 related.

  


• RN-ffmpeg Get Frames w/o saving

  14 avril 2020, par Ahmet Biçer

  I am using react-native-ffmpeg library to get frames from a video file with this code ;

  



  RNFFmpeg.execute(`-ss 00:00:03 -to 00:00:04 -i input.mp4 -vf fps=1 ${RNFS.PicturesDirectoryPath}/out%05d.png`)


  



  This works as expected, saves the frames to given file but i need to render the frames before saving to the file system. So i thought i can use base64 encoding to get the image without saving. But i couldn't find any solution for this. Do you guys have any idea about solving this problem. If there is another solution rather than base64 encoding for getting the images before saving to filesystem i will happy to see that too. Thanks !

  



  Edit :
There is a function called av_base64_decode in the documentation but i don't know how to use with my code.

  


• Video playing, how to play a video back a a rapid rate at random timestamp locations

  10 avril 2020, par Zarc Rowden

  Note : this is a mildly general question that is looking more for pointers in the right direction and not exactly requiring a concise coded answer. I appreciate any and all input, thank you for lending your brain power to me for this moment :)

  



  I have a script that receives midi messages in real time and triggers playback of a single video on various timestamps that are changed/selected regularly and randomly by a user. Currently this is working in the browser, however, I've realized that there is some noticeable latency between (i'm guessing the cause here so please correct me) the moment a request to play a video at a specific time is made(note : the video is not being requested over the wire, this action does not take place until a JS Blob Url is loaded into the player) and the moment where that request is fulfilled and delivered from storage to pixels on the screen.

  



  My question is : Is it reasonable to assume that there is a tool out there, that given the correct video format and optimizations both in the code and in the file that could load an entire, say : 1 gb video into memory and play it back at random timestamps every 60 milliseconds at completely random, constantly changing timestamps.

  



  If you're now all the way down here... Thanks for reading this far, or scanning ! Please let me know if this question makes any sense / could be improved, I'm happy to clarify further.