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• Can't play MP4 after download

  14 août 2018, par joe

  I am using a downloader program in Firefox to download videos playing in Firefox. Most of the time final MP4 is playable. But sometimes I get MP4 file that looks good(shows file size) but shows no length of video in file explorer.

  I get this error log.

  Could not get information from media 'ESPN 2 (HD) Live Stream Channel' from file 'C:\Download\dwHelper\ESPN 2 (HD) Live Stream Channel.mp4'. The file might be corrupted.
  
  
  
  {
  
      "file": "C:\\Download\\dwHelper\\ESPN 2 (HD) Live Stream Channel.mp4",
  
      "stat": {
  
          "dev": 3831878042,
  
          "mode": 33206,
  
          "nlink": 1,
  
          "uid": 0,
  
          "gid": 0,
  
          "rdev": 0,
  
          "ino": 9007199254752056,
  
          "size": 610722524,
  
          "atimeMs": 1534241605017.09,
  
          "mtimeMs": 1534241604156.685,
  
          "ctimeMs": 1534241604426.08,
  
          "birthtimeMs": 1534237675494.6475,
  
          "atime": "2018-08-14T10:13:25.017Z",
  
          "mtime": "2018-08-14T10:13:24.157Z",
  
          "ctime": "2018-08-14T10:13:24.426Z",
  
          "birthtime": "2018-08-14T09:07:55.495Z"
  
      }
  
  }
  
  Exit code: 1
  
  ffprobe version n4.0-1-gdc49a24-vdhcoapp Copyright (c) 2007-2018 the FFmpeg developers

  built with gcc 5.3.1 (GCC) 20160211

  configuration : —cross-prefix=x86_64-w64-mingw32- —sysroot=/usr/x86_64-w64-mingw32/ —extra-ldflags=-static-libgcc —target-os=mingw32 —arch=x86_64 —prefix=/home/mig/vdhcoapp/converter/src-build/win/64/converter-build —extra-version=vdhcoapp —extra-cflags=-I/home/mig/vdhcoapp/converter/src-build/win/64/deps/include —extra-ldflags=’-static-libgcc -L/home/mig/vdhcoapp/converter/src-build/win/64/deps/lib -L/home/mig/vdhcoapp/converter/src-build/win/64/zlib’ —extra-libs=-lpthread —pkg-config=/usr/bin/x86_64-w64-mingw32-pkg-config —enable-shared —enable-gpl —enable-pthreads —disable-w32threads —enable-libmp3lame —enable-libopenjpeg —enable-libopus —enable-libtheora —enable-libvorbis —enable-libvpx —enable-libwebp —enable-libx265 —enable-libxvid —enable-libx264 —enable-avresample —disable-doc

  libavutil 56. 14.100 / 56. 14.100

  libavcodec 58. 18.100 / 58. 18.100

  libavformat 58. 12.100 / 58. 12.100

  libavdevice 58. 3.100 / 58. 3.100

  libavfilter 7. 16.100 / 7. 16.100

  libavresample 4. 0. 0 / 4. 0. 0

  libswscale 5. 1.100 / 5. 1.100

  libswresample 3. 1.100 / 3. 1.100

  libpostproc 55. 1.100 / 55. 1.100

  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000024c3900] moov atom not found

  C :\Download\dwHelper\ESPN 2 (HD) Live Stream Channel.mp4 : Invalid data found when processing input

  It looks like moov atom is missing thus can’t aggregate PART file into final playable MP4.

  I understand that during download, PART file is created. Then later PART is aggregated into final MP4.

  So question is how can I make this MP4 to play ?
  or is it impossible to play cus moov atom was not properly downloaded ?

  Any thoughts ?
  Thanks

• How to downscale video using subprocess and then piping the data over to stdout and play using ffplay and save it as well

  2 avril 2021, par ZeroDay Fracture

  I am trying to use ffmpeg to downscale a video and pipe the stdout data to ffplay to play the new downsized video by piping it to ffplay on aws lambda.

  


  This is the command I have so far, but for some reason adding a scale option is not working.

  


  I am trying to run this command locally before I deploy it on python with subprocess command. I need the raw video to be able to save into database for streaming the data in realtime.

  


  %ffmpeg -i sample.mp4  -vf scale=240:-2 -f  mpegts -c:v copy -af aresample=async=1:first_pts=0 - | ffplay -

  


  adding the scale optioin for some reason is saving the video as the name scale=240 :-2 which does not make sense.

  


• How to play an local video in arbitrary codec and format in browser ? [closed]

  24 septembre 2023, par HanXu

  I am developing a video player in browser to let the user select a local video to play, and want to support as many video formats as possible. I know that in browser a video tag can only play videos in a limited set of codecs, and on desktop libraries like VLC can play literally any videos. I would like to bring that broad compatibility to the browser, but not sure how to achieve it.

  


  One thing come up in my mind is to let the user run a thin client natively, which read the local video and stream it at, say, http://localhost:8080, in some web-friendly codec and format, and in the frontend I use a video with src to be http://localhost:8080.

  


  In the client I think I need to run some ffmpeg command to somehow stream and process the video in real-time. I also run into the libVLC which seems nice, and am not sure which one to use.

  


  Furthermore, I need to enable the user to seek to any arbitrary timestamp, and am not sure if the streaming technic supports it.

  


  I have done some googling, and found a method which first runs a ffmpeg command as

  


  VIDSOURCE="/some/video.mp4"
AUDIO_OPTS="-c:a aac -b:a 160000 -ac 2"
VIDEO_OPTS="-s 854x480 -c:v libx264 -b:v 800000"
OUTPUT_HLS="-hls_time 10 -hls_list_size 10 -start_number 1"
ffmpeg -i "$VIDSOURCE" -y $AUDIO_OPTS $VIDEO_OPTS $OUTPUT_HLS /some/public/video.m3u8


  


  and in the frontend I can use the react-player to play the video like

  


  <reactplayer url="/some/public/video.m3u8"></reactplayer>&#xA;

  


  However, I can not seek to an arbitrary timestamp, and the ffmpeg command creates a lot of .ts files one by one about which I am not sure what is going on. It seems that before it creates a video77.ts, I can not seek to timestamp within that segment.

  


  All in all, I am looking for some solution like

  


  

  


  that supports

  


  

  • playing videos in browsers in as many codecs and formats as possible,

  


  • allowing users to seek to any arbitrary timestamp.

  


  


  Since many native video player like VLC supports it, I believe it can be done. Does anyone have any idea that may help ? Appreciate in advance !