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• If you rotate the iPhone's video with ffmpeg, the rotation information sticks. Can I hide this ?

  24 août 2017, par howmanylife

  The following implementation is a command to rotate the movie by 90 degrees.

  ffmpeg -i video.mp4 -vf transpose=1 -metadata:s:v:0 rotate=0 videoo.mp4
  
  -vf transpose=1

  The iPhone’s video contains rotation information and actually

  ffprobe -show_streams -print_format json videoo.mp4 2>/dev/null

  To output motion picture information or rotation information as described below.

   "tags": {
  
                  "rotate": "90",
  
                  "creation_time": "2017-08-24T01:49:38.000000Z",
  
                  "language": "und",
  
                  "handler_name": "Core Media Data Handler",
  
                  "encoder": "'avc1'"
  
              },
  
              "side_data_list": [
  
                  {
  
                      "side_data_type": "Display Matrix",
  
                      "displaymatrix": "\n00000000:            0       65536           0\n00000001:       -65536           0           0\n00000002:            0           0  1073741824\n",
  
                      "rotation": -90
  
                  }
  
              ]
  
  
  
  
  
  
  
  "rotate": "90",

  and

  "side_data_list":

  and

  "rotation": -90

  Is it possible to hide this ? Or is it possible to erase only this rotation information ?

• ffmpeg rtmp webcam live stream iphone/pad segment size too big

  1er février 2013, par Foo Barazz

  I'm transcoding a rtmp stream from a red5 server for use to live stream on a iphone or ipad device. I built latest ffmpeg version from git repo using the built in segmenter to create .ts files and m3u8 playlist file using the following :

  ffmpeg -probesize 50k -i "rtmp://localhost/oflaDemo/red5StreamDemo live=1" \
  
  -c:v libx264 -b:v 128k -vpre ipod320 -flags -global_header -map 0 \
  
  -f segment -segment_time 3 -segment_list foo.m3u8 -segment_list_flags +live \
  
  -segment_list_type m3u8 -segment_list_size 5 -segment_format mpegts foo%d.ts

  This works fine, but I can't get the segment size smaller than about 12 sec even set to 3 (-segment_time 3). It seems to be caused by libx264 vcodec.
  Am I missing any flag ?

  By the way, you can simple run the ffmpeg command above successfully by starting red5 SimpleBroadcaster example.

• Unable to play video from firebase cloud storage download url on Iphone Safari [closed]

  26 janvier 2024, par Acid Coder

                      getDownloadURL(ref)
                        .then(url => {
                            //... save the url to state
                        })


  


  front end : React

  


                              &#xA;                                <source src="{videoURL}" type="video/mp4"></source>&#xA;                            &#xA;

  


  work fine on PC and Android, but on Iphone Safari, only 1 out of 10 videos can be played

  


  

  


  all video are from the same source, going through same compression, from mp4 to mp4

  


  import ffmpeg from 'fluent-ffmpeg'

        ffmpeg(inputPath)
            .output(outputPath)
            .videoCodec('libx264')
            .audioCodec('aac')
            .on('end', () => {
                // ...
            })
            .on('error', err => {
                // ...
            })
            .run()