Recherche avancée

Sur d’autres sites (5906)

• Flutter ffmpeg kit : Invalid size error when trying to scale video

  27 juillet 2023, par veryepicdude

  I'm trying to resize a video to match instagram's video format requirements. I'm using the ffmpeg_kit_flutter_full_gpl: ^5.1.0 package to do so and this is the function I'm calling :

  


  Future<void> resizeVideo(String input, String output) async {&#xA;&#xA;  final command = &#x27;-i $input -c:v libx264 -aspect 16:9 -crf 18 -vf "scale=iw*min(1280/iw\,720/ih):ih*min(1280/iw\,720/ih),pad=1280:720:(1280-iw)/2:(720-ih)/2" -fpsmax 60 -preset ultrafast -c:a aac -b:a 128k -ac 1 -use_editlist false -ar 48000 -pix_fmt yuv420p -movflags &#x2B;faststart -t 59 -y $output&#x27;;&#xA;  final session = await FFmpegKit.execute(command);&#xA;  print("resize done with ${await session.getReturnCode()}");&#xA;}&#xA;</void>

  


  However I get this error every time :

  


   Stream #0:0[0x1](und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 60 kb/s (default)
    Metadata:
      creation_time   : 2023-07-27T15:30:28.000000Z
      handler_name    : Core Media Audio
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Video: hevc (hvc1 / 0x31637668), yuv420p(tv, smpte170m/bt709/bt709), 720x1280, 2085 kb/s, 30 fps, 30 tbr, 600 tbn (default)
    Metadata:
      creation_time   : 2023-07-27T15:30:28.000000Z
      handler_name    : Core Media Video
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:1 -> #0:0 (hevc (native) -> h264 (libx264))
  Stream #0:0 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
[Parsed_scale_0 @ 0x2834a53f0] Invalid size 'iw*min(1280/iw'
[AVFilterGraph @ 0x28278e3a0] Error initializing filter 'scale'[AVFilterGraph @ 0x28278e3a0]  with args 'iw*min(1280/iw'[AVFilterGraph @ 0x28278e3a0] 
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:1
[aac @ 0x105334290] Qavg: 461.613
[aac @ 0x105334290] 2 frames left in the queue on closing


  


  Removing the scale filter makes the function work fine, but it fails the instagram video requirements listed here.
Any help will be greatly appreciated.

  


• ffmpeg scale down video dynamically (squeeze-back) or zoompan out to smaller than original VER2

  19 juillet 2023, par loarrin

  I have 2 videos, I'm trying to overlay one on top of the other, and have it shrink down in an animated fashion until it appears like a picture-in-picture setup. Then, after a few seconds it should scale back up. Just like in this question. Here is the working code from there :

  


  ffmpeg -i bg.mov -i top.mov -filter_complex "[0:v]scale=1920x1080,setpts=PTS-STARTPTS[bg]; [1:v]setpts=PTS-STARTPTS+2/TB, scale=-1:'480+600*abs(sin((t-2)*2*PI/8))':eval=frame[top]; [bg][top]overlay" -vcodec libx264 out.mp4


  


  It works perfectly, but I have one difference I cannot achieve modifying existing code : scale filter in this example resizes the second video stream having attraction point in the top left corner of this stream. I mean, when the second stream is getting smaller, it is scaled to the top left corner. And if it is getting bigger, it again stretches from the top left corner. The top left corner of the stream being scaled is staying in one place constantly no matter what.

  


  Is it possible to make more symmetrical version of this scale code, so when the second stream is scaled it is scaled from and to the top center of it (So the top left corner would move right when the stream is getting smaller and move to the left then the stream is getting bigger) ?

  


  

  


• avfilter/avf_showcwt : add sqrt frequency scale

  9 juillet 2023, par Paul B Mahol

  avfilter/avf_showcwt : add sqrt frequency scale
  

  • [DH] doc/filters.texi
  • [DH] libavfilter/avf_showcwt.c