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• Best Web Video Encoding Practices for IOS (FFMpeg)

  21 juin 2012, par MagicMushroom

  I am working on an online video repository system for a client, written mostly in PHP. At the moment I am building a mobile version of our desktop website. Our desktop site allows users to watch videos in the browser, much like YouTube.

  My client uploads videos through the manager interface I have created, and my application uses FFmpeg on the server to transcode his videos into several resolutions and bitrates. I am no expert on FFmpeg, and while I do not know the ins and outs of each individual setting, I do understand how it works as a whole. Right now, we are using the mp4 container format with the h.264 codec to encode our videos. Our command looks like :

  ffmpeg -y -i "INPUT FILE.mov" -f mp4 -s 640x480 -vcodec libx264 -preset fast -maxrate 1500 -bitrate 1000 -bufsize 4096 -acodec libfaac -ab 192 -ac 2 "OUTPUT_FILE.mp4" >> "FILE.log" 2>&1 &

  I'm hoping to gain information about best practices with encoding video for web streaming on IOS and other mobile devices using FFmpeg. What resolutions and settings make for good mobile streaming video ? How can I ensure maximum compatibility across the sea of Android devices ?

• What encoders/decoders/muxers/demuxers/parsers/filters do I need to enable in FFMpeg for converting an mp4 video to a gif ?

  21 juin 2020, par kostik

  I am building FFmpeg with custom options to reduce the final size of apk file on android. I want just convert a mp4 file to a gif.
Following is my options specified

  


   --disable-everything
 --enable-decoder=mpeg4,mpegvideo,aac,gif,h264
 --enable-parser=aac,mpeg4video,mpegaudio,mpegvideo,gif,h264
 --enable-demuxer=mpegvideo,aac,mov,gif,h264
 --enable-muxer=mp4,gif,mov,h264
 --enable-protocol=file
 --enable-encoder=mpeg4,mov,gif,h264
 --enable-filter=scale,fps,copy,palettegen,vflip,paletteuse,crop


  


  What other options do i need to add to successfully run this command ?

  


  ffmpeg -y -i input.mp4 -vf "fps=15,scale=320:-1:flags=lanczos" -pix_fmt rgb24 output.gif


  


  or this command

  


  ffmpeg -y -i input.mp4 output.gif


  


  After I added module into Android Studio I run FFmpeg command.
Iam getting this error :

  


  2020-06-21 12:16:09.883 8871-9102/com.example.myapplication W/mobile-ffmpeg: [graph 0 input from stream 0:0 @ 0x7088243f40] sws_param option is deprecated and ignored
2020-06-21 12:16:09.885 8871-9102/com.example.myapplication W/mobile-ffmpeg: Incompatible pixel format 'rgb24' for codec 'gif', auto-selecting format 'rgb8'
2020-06-21 12:16:09.885 8871-9102/com.example.myapplication E/mobile-ffmpeg: Output pad "default" with type video of the filter instance "Parsed_scale_1" of scale not connected to any destination
2020-06-21 12:16:09.885 8871-9102/com.example.myapplication E/mobile-ffmpeg: Error reinitializing filters!
2020-06-21 12:16:09.885 8871-9102/com.example.myapplication E/mobile-ffmpeg: Failed to inject frame into filter network: Invalid argument
2020-06-21 12:16:09.886 8871-9102/com.example.myapplication E/mobile-ffmpeg: Error while processing the decoded data for stream #0:0


  


  I also tried to include FULL library and it that case everything worked as expected.

  


  Thanks for your help.

  


• MobileFFmpeg - get progress of concatenation of a video

  18 mai 2020, par STerrier

  Is there a way to grab the progress of the concatenation using Mobile FFmpeg ? Mobile FFmpeg displays stats by default in the console and I can see the time length of the video which I want but I can't find a way to grab it so I can create a progress bar.

  



  Data displayed in the console
2658560kB time=01:30:40.00 bitrate=4003.5kbits/s speed=60.9x \rframe=137002 fps=1524 q=-1.0
2678272kB time=01:31:20.00 bitrate=4003.7kbits/s speed=61x \rframe=138252 fps=1528 q=-1.0

  



  func encodeWebp(m3u8: String, completed: () -> Void){
    guard let sessionid = sessionID else {return}

    let lastName: String = m3u8
    let docFolder = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
    let output = URL(fileURLWithPath: docFolder + "/OfflineSession/\(sessionid)").appendingPathComponent("\(lastName).mp4")
    let outputTxt = URL(fileURLWithPath: docFolder + "/OfflineSession/\(sessionid)").appendingPathComponent("\(lastName).txt")
    let fileName = "\(m3u8)_ffmpegData.txt"
    let textFile = URL(fileURLWithPath: docFolder).appendingPathComponent("OfflineSession/\(sessionid)/\(fileName)")

    let ffmpegCommand = "-f concat -i \(textFile) -c:v copy -c:a copy \(output) -progress \(outputTxt)"

    MobileFFmpeg.execute(ffmpegCommand)

    completed()

}


  



  GITHUB - Mobile FFmpeg
https://github.com/tanersener/mobile-ffmpeg