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• Nginx video streaming - ffmpeg convert to flv, but requsted is mp4

  18 juin 2012, par abrahab

  I am converting videos from different sources with ffmpeg to mp4 with libx264 codec.
  The following command (simplified) :
  ffmpeg -i 1.mp4 -y -f mp4 -vcodec libx264 -crf 28 -threads 2 -strict experimental -acodec aac -ab 56k -ar 44100 -ac 2 temp.mp4

  Then, I can not stream the output file (500 Internal Server Error) with nginx mp4-streaming solution (aka http pseudo streaming). My system administrator found, that if rename file to flv it stream well, so, seems the output file is not mp4, but flv ? Why ? How to correctly convert ? Or, please, suggest how to stream video properly ? I think that mp4 is much better then flv... therefore I choose mp4.

  In other words, the problem is to stream output file like mp4.

  ps i also need to be sure that this video will always work at ipad after convertation. thanks and sorry for my bad english.

  EDIT : I found that if convert video with the same string but without -vcodec libx264 - nginx can serve the output .mp4 file well. where may be the problem ?

• How do I resize my video ? in proportion (python)

  23 septembre 2022, par ggn0

  *I am sorry for my poor English. It's a translator.

  


  I used Python moviepy to resize it, but the pixels are broken. I want to make the video 9:16 ratio while maintaining the original image quality. (So that there are black frames on both sides)

  


  from moviepy.editor import *
c = VideoFileClip('test.mp4')
f = c.resize(newsize=(1080,1920))
f.write_videofile('aa.mp4')


  


  This code causes pixels to collapse.

  


  Let me show you an example picture.

  


  Original Video Example

  


  The video I want

  


  Pictures that come out using movie resize (other example pictures, pixels collapse and proportions collapse) Pictures that I don't want

  


  It doesn't have to be moviepy, so I'd appreciate it if you could tell me how to use Python. (PIL ? opencv ?)

  


  Thank you so much. Have a nice day 🙏

  


• Using FFMPEG and PHP to encode HLS video on the fly

  21 avril 2024, par mrsmith

  I'm re-encoding a MP4 video to HLS using FFMPEG with PHP. I'm trying to then directly serve to the output to a HTML page's <video></video> tag. The following script (encode.php) encodes the video as I require and it works if I use the script url directly in VLC player for example but I'm struggling to get the gtml page to play it. The resulting video file should be compatible with most browsers. I use video.src = 'encode.php' on my player html page.

  


  Any help appreciated.

  


  <?php

$input_video = 'whatever.mp4';

// video passthrough
// hls format
// audio (english strems only) to aac (6 channel)
// output to stdout

$ffmpeg_command = 'ffmpeg -i ' . escapeshellarg($input_video) . ' -map 0:v -c:v copy -map 0:a:m:language:eng -c:a aac -ac 6 -b:a 320k -f hls -hls_time 30 -hls_list_size 120 -start_number 0 -';

$handle = popen($ffmpeg_command, 'rb');

header('Content-Type: application/vnd.apple.mpegurl');
header('Content-Disposition: inline; filename="output.m3u8"');

// stream the output to the browser
fpassthru($handle);
pclose($handle);
?>