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• How to speedup screenshot capture of an rtsp stream via ffmpeg ?

  20 mars 2020, par Sudipta B

  I want to capture a fresh screenshot from an rtsp stream and pass the data on via php whenever an ajax endpoint is called.

  Currently I am simply running

  $resp = exec( 'ffmpeg -rtsp_transport tcp -y -i '.$post['link'].' -vframes 1 '.$path.$imagename);

  The problem is this takes a lot of time to generate a screenshot, about 4 second per capture if the stream is good. If the stream drops frames or causes an error, I won’t get a response and the script will timeout.

  Is there a way to optimize this or allow for fault tolerance ? And overall speedup things so I can get a screenshot every second ? If there’s a better solution over ffmpeg, I am willing to try it as well !

• HLS Encoding Resulting in "No Supported Source Was Found"

  18 février 2023, par Paulamonopoly

  I'm currently facing the most bizare problems I've come across, so I'm hoping someone can explain why this is happening. I'm currently converting my Movie and Show libary to HLS for buffering and bandwidth reasons etc.

  


  My file structure for these movies and shows are as follows :

  


  /Movies/[TMDB ID]/[TMDB ID].mp4

  


  /Shows/[TMDB ID/[Season Number]/[Episode Number]/[Episode Number].mp4

  


  I have converted my entire movie collection successfully using the below command.

  


  find /* -type f -name "*.mp4" -exec realpath {} \; -exec ffmpeg -i {} -codec: copy -start_number 0 -hls_time 10 -hls_list_size 0 -f hls -hls_segment_filename '{}-P%03d' {}.m3u8 \;


  


  This is taking my named mp4 files and converting them to the originalname.m3u8 with chunks following the naming scheme of originalname-PXXX where P indicates the part number. I know there's no file extensions attached with the chunks but it's not needed.

  


  You can view this result here : Example

  


  This result also works if loaded into HLS Player : HLS Player

  


  So there is evidently nothing wrong with the converting of my videos or even the result of the videos.

  


  Now, if I convert a TV Show using the exact same command, it does indeed convert them, it does use a slightly different file structure as with seasons and episodes etc which can be seen above, but now it results in the error : "No Supported Source Was Found" in the console and repeatedly tries to play Part 000 without success.

  


  This can be seen here : Example

  


  And the errors if loaded into HLS Player : HLS Player

  


  I have tried changing numerous things to try and resolve this error as well as checking things, the things I have checked are the media condition itself maybe it's a corrupted file ?

  


  The original Mp4 file can be played here without any problems, so we know the Mp4 file originally is perfectly fine. I have also tried adding a file extension to the chunks such as .ts and .mp4 etc etc with also no success.

  


  I have even thought maybe it's the directories so I have moved a show into the movies directory with no success, I have also moved a movie into the show directory which resulted in a working HLS Stream so it's nothing to do with the directories.

  


  I have tried exending the file name length thinking it's possibly the naming scheme with 1.m3u8 not been long enough of a file name by using placeholder text such as 03051.m3u8 as well as the chunk naming scheme 03051-PXXX possibly not been long enough.

  


  I have noticed though that using this command :

  


  ffmpeg -allowed_extensions ALL -i {} -c copy -bsf:a aac_adtstoasc {}.mkv \;


  


  Does recombine my HLS video correctly with the same file size etc, however I have noticed that the video itself is corrupt and doesn't play. So this makes be believe the issue lies within the converting of the initial Mp4 file into m3u8.

  


• How to use existing .so file in my other android project in windows PC ?

  28 mai 2013, par Mihir Shah

  I have to use ffmpeg library for video editing application in android. I have no experience in JNI or NDK. but I have ffmpeg.so file. Can I directly use it in my new android application ?

  I am using it but generating error : Caused by: java.lang.UnsatisfiedLinkError: Couldn't load videokit: findLibrary returned null

  If not, what are the steps to generate .so file ? I have search lot of things but all are in mostly ubuntu. How to generate in windows or mac os ? Can i decompile my existing .so file ?