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quasarstream / PHP-FFmpeg-video-streaming

📼 Package media content for online streaming(DASH and HLS) using FFmpeg
https://www.quasarstream.com/op/php/ffmpeg-streaming?u=php-ff
MIT License
514 stars 117 forks source link

Portrait videos are stretching #83

Open shankar-bavan opened 3 years ago

shankar-bavan commented 3 years ago

When I encode mobile portrait video to hls, it got stretch. how to encode without stretching?

This issue only for video recorded from iphone

            $video->hls()
            ->encryption($save_to, $url, 1)
            ->setFormat($format)
            ->setHlsTime(5)
            ->setHlsAllowCache(false)
            ->autoGenerateRepresentations()
            ->save($save_path);
bekee commented 3 years ago

Has anyone found solution to this issue?

shankar-bavan commented 3 years ago

@aminyazdanpanah any solution for this ?

aminyazdanpanah commented 3 years ago

It seems like the FFmpeg library has an issue with the 'h264 apple encoder'. I will try to reach out to FFmpeg developers and report this bug.

I will be keeping this issue until I(or anyone else) find a solution.

chmerev commented 3 years ago

We had such a problem. It is necessary to take into account the aspect ratio when setting the dimensions.

By default you load 1080 by 1920 video for example. And FFMPEG takes and renders 1920 and 1080 and produces a stretched video image.

If the video is 1080 by 1920, then we take the closest available resize - this is 720p.

And set the parameters to resize 1280 x 720.

In general, you need to understand which video comes in and calculate the aspect ratio for each video and there will be no problem

crishoj commented 1 year ago

I suspect the cause could be that rotation is not handled by autoGenerateRepresentations().

Example input file in portrait format, from an iPhone:

  Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 129 kb/s (default)
    Metadata:
      creation_time   : 2023-09-29T12:27:45.000000Z
      handler_name    : Core Media Audio
      vendor_id       : [0][0][0][0]
  Stream #0:1(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 568x320, 705 kb/s, 30 fps, 30 tbr, 600 tbn, 1200 tbc (default)
    Metadata:
      rotate          : 90
      creation_time   : 2023-09-29T12:27:45.000000Z
      handler_name    : Core Media Video
      vendor_id       : [0][0][0][0]
    Side data:
      displaymatrix: rotation of -90.00 degrees 👈 This indicates rotation

ffprobe indicates a resolution of 568x320 (landscape), but due to 90° rotation the video is actually 320x568 (portrait).