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• How to add watermark to video in Flutter using Flutter_ffmpeg

  14 mai 2021, par user433575

  I cannot figure out why my ffmpeg commands aren't working...

  


    Future<void> watermark(filePath, width, height) async {&#xA;&#xA;final String outPath = &#x27;watermarked.mp4&#x27;;&#xA;final String inputVideo =&#xA;    await rootBundle.loadString(&#x27;assets/ffmpeg/demo.mov&#x27;);&#xA;final String inputWatermark = await rootBundle&#xA;    .loadString(&#x27;assets/ffmpeg/video_overlay.png&#x27;);&#xA;final arguments =&#xA;    &#x27;-i $inputVideo -i $inputWatermark -filter_complex overlay=10:10 -codec:a copy $outPath&#x27;;&#xA;&#xA;&#xA;final int rc = await FlutterFFmpeg().execute(arguments);&#xA;assert(rc == 0);&#xA;print("outPath $outPath");&#xA;&#xA;uploadFile(outPath, "gallery");&#xA;</void>

  


  }

  


  Thanks

  


• ffmpeg joinnig videos in php linux

  28 octobre 2013, par user2226181

  I am trying to add joining videos with no audio in ffmpeg php using linux operating system. My code is this :

  cat output_1.mp4 output_2.mp4 output_3.mp4 output_4.mp4 > final.mp4

  It is giving me an output of final.mp4 in result but there is a problem in the final.mp4 there is only first video which is output_1.mp4 in final video, the other videos are not being concatenate. Please help me in this case.

  Thanks

• ffmpeg same bit rate in hls file across resolutions

  4 août 2019, par Saurabh

  We are using following command to generate dash and hls file for a given video :

  ffmpeg -y -nostdin -loglevel error -i input.mp4 \
  
          -map 0:v:0  -map 0:v:0 -map 0:v:0  -map 0:v:0  -map 0:v:0  -map 0:v:0 -map 0:a\?:0  \
  
          -maxrate:v:0 350k -bufsize:v:0 700k  -c:v:0 libx264 -filter:v:0 "scale=320:-2"  \
  
          -maxrate:v:1 1000k -bufsize:v:0 2000k -c:v:1 libx264 -filter:v:1 "scale=640:-2"  \
  
          -maxrate:v:2 3000k -bufsize:v:0 6000k -c:v:2 libx264 -filter:v:2 "scale=1280:-2" \
  
          -maxrate:v:3 245k -bufsize:v:3 600k -c:v:3 libvpx-vp9 -filter:v:3 "scale=320:-2"  \
  
          -maxrate:v:4 700k  -bufsize:v:3 1400k -c:v:4 libvpx-vp9 -filter:v:4 "scale=640:-2"  \
  
          -maxrate:v:5 2100k -bufsize:v:3 4200k -c:v:5 libvpx-vp9 -filter:v:5 "scale=1280:-2"  \
  
          -use_timeline 1 -use_template 1 -adaptation_sets "id=0,streams=v  id=1,streams=a" \
  
          -threads 8 -seg_duration 5 -hls_playlist true -f dash output/output.mpd

  This works and generates hls files also as expected, one sample m3u8 file below :

  #EXTM3U
  
  #EXT-X-VERSION:7
  
  #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="group_A1",NAME="audio_6",DEFAULT=YES,URI="media_6.m3u8"
  
  #EXT-X-STREAM-INF:BANDWIDTH=129663,RESOLUTION=320x168,CODECS="avc1.64000c,mp4a.40.2",AUDIO="group_A1"
  
  media_0.m3u8
  
  
  
  #EXT-X-STREAM-INF:BANDWIDTH=129663,RESOLUTION=640x336,CODECS="avc1.64001e,mp4a.40.2",AUDIO="group_A1"
  
  media_1.m3u8
  
  
  
  #EXT-X-STREAM-INF:BANDWIDTH=129663,RESOLUTION=1280x670,CODECS="avc1.64001f,mp4a.40.2",AUDIO="group_A1"
  
  media_2.m3u8
  
  
  
  #EXT-X-STREAM-INF:BANDWIDTH=330756,RESOLUTION=320x168,CODECS="vp09.00.11.08,mp4a.40.2",AUDIO="group_A1"
  
  media_3.m3u8
  
  
  
  #EXT-X-STREAM-INF:BANDWIDTH=329663,RESOLUTION=640x336,CODECS="vp09.00.21.08,mp4a.40.2",AUDIO="group_A1"
  
  media_4.m3u8
  
  
  
  #EXT-X-STREAM-INF:BANDWIDTH=329663,RESOLUTION=1280x670,CODECS="vp09.00.31.08,mp4a.40.2",AUDIO="group_A1"
  
  media_5.m3u8

  Now as you notice, the Bandwidth is same for resolution of 320x168, 640x336 and 1280x670, which might have happened because of nature of video.

  But the issue with this is in iOS’s AVPlayer it always picks the minimum resolution one and never picks the better resolution stream even if it is available because of same bitrate.

  So the question I want to ask is : is there some option available to ensure - I always have some difference in the bitrates of different resolutions or more specific, bit rate always increase(may be just by few bytes) for increasing resolutions.

  ---

  EDIT

  Earlier I was using -b:v option per output instead of -maxrate:v, I was getting following output for same video :

  #EXT-X-STREAM-INF:BANDWIDTH=479663,RESOLUTION=320x168,CODECS="avc1.64000c,mp4a.40.2",AUDIO="group_A1"
  
  media_0.m3u8
  
  
  
  #EXT-X-STREAM-INF:BANDWIDTH=1129663,RESOLUTION=640x336,CODECS="avc1.64001e,mp4a.40.2",AUDIO="group_A1"
  
  media_1.m3u8
  
  
  
  #EXT-X-STREAM-INF:BANDWIDTH=3129663,RESOLUTION=1280x670,CODECS="avc1.64001f,mp4a.40.2",AUDIO="group_A1"
  
  media_2.m3u8

  If you see, Bandwidth has increased considerably, for the same video and same video quality, also all the file sizes also increased 4x. as par my understanding with maxrate option, ffmpeg optimises the output and provides only required bandwidth, while with b:v option it forcefully increases the bandwidth to given values without any benefit in terms of quality. So essentially you get same quality video at much higher bandwidth.

  Which is why I want to use maxrate option but with increasing bandwidth. If I manually change the bandwidth to increasing order in the output with maxrate option, adaptive bit rate starts to work in iOS’s AVPlayer.