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• Netflix neutrality

  31 mai 2014, par Mans — Law and liberty

  In the net neutrality debate, a rarely mentioned aspect is the widespread practice amongst ISPs of over-subscribing bandwidth. Before streaming video became readily available and popular, this was viable, even reasonable, since few users managed to actually saturate their links for extended periods of time. Now that customers are suddenly … Continue reading →

• ffmpeg : does 2 step encoding solves issues during video conversion ?

  14 novembre 2017, par Vini.g.fer

  I’m encoding several videos to x265 format to save disk storage, and on some of them some errors happen. Like these ones below :

  [h264 @ 0x285f800] error while decoding MB 15 15, bytestream -29ate=3310.7kbits/s
  
  [h264 @ 0x285f800] concealing 2434 DC, 2434 AC, 2434 MV errors in P frame
  
  [matroska,webm @ 0x22205e0] Read error at pos. 1932044330 (0x7328a82a)
  
  [h264 @ 0x27890c0] illegal short term buffer state detected
  
  [h264 @ 0x27890c0] Missing reference picture, default is 65694
  
  [h264 @ 0x27d0880] mmco: unref short failure
  
  [h264 @ 0x27d0880] error while decoding MB 63 29, bytestream -8rate=3230.1kbits/s dup=0 drop=1
  
  [h264 @ 0x27d0880] concealing 1266 DC, 1266 AC, 1266 MV errors in P frame
  
  [matroska,webm @ 0x22205e0] Read error at pos. 2048927876 (0x7a202884)
  
  [h264 @ 0x27304e0] mmco: unref short failureime=00:48:51.54 bitrate=3229.2kbits/s dup=0 drop=1
  
  [h264 @ 0x27890c0] error while decoding MB 28 35, bytestream -16ate=3177.0kbits/s dup=0 drop=1
  
  [h264 @ 0x27890c0] concealing 821 DC, 821 AC, 821 MV errors in P frame
  
  [matroska,webm @ 0x22205e0] Read error at pos. 2112109973 (0x7de43d95)
  
  [h264 @ 0x285f800] mmco: unref short failureime=00:50:36.21 bitrate=3175.5kbits/s dup=0 drop=1
  
  [h264 @ 0x27d0880] error while decoding MB 51 21, bytestream -28ate=3199.4kbits/s dup=0 drop=1
  
  [h264 @ 0x27d0880] concealing 1918 DC, 1918 AC, 1918 MV errors in P frame
  
  [matroska,webm @ 0x22205e0] Read error at pos. 2202555497 (0x83485469)
  
  [matroska,webm @ 0x22205e0] Read error at pos. 2409903171 (0x8fa43443)306.9kbits/s dup=0 drop=1
  
  [h264 @ 0x27d0880] error while decoding MB 3 30, bytestream -7
  
  [h264 @ 0x27d0880] concealing 1246 DC, 1246 AC, 1246 MV errors in P frame
  
  [h264 @ 0x27890c0] error while decoding MB 7 5, bytestream -7bitrate=3396.2kbits/s dup=0 drop=1
  
  [h264 @ 0x27890c0] concealing 3242 DC, 3242 AC, 3242 MV errors in B frame
  
  [matroska,webm @ 0x22205e0] Read error at pos. 2628527465 (0x9cac2569)
  
  [h264 @ 0x285f800] mmco: unref short failuretime=01:02:15.08 bitrate=3396.3kbits/s dup=0 drop=1
  
  [h264 @ 0x2818040] error while decoding MB 36 30, bytestream -12rate=3473.5kbits/s dup=0 drop=1
  
  [h264 @ 0x2818040] concealing 1213 DC, 1213 AC, 1213 MV errors in P frame
  
  [matroska,webm @ 0x22205e0] Read error at pos. 2874947326 (0xab5c36fe)
  
  [h264 @ 0x27890c0] error while decoding MB 46 8, bytestream -6itrate=3590.8kbits/s dup=0 drop=1
  
  [h264 @ 0x27890c0] concealing 2963 DC, 2963 AC, 2963 MV errors in B frame
  
  [matroska,webm @ 0x22205e0] Read error at pos. 3162785874 (0xbc844852)

  If I add 2-step encoding, that can fix these errors ? What exactly does 2-step encoding does ? The command I’m using is pretty much the one on this answer https://askubuntu.com/a/718300/396175 so how (which parameter) should I use to apply 2-step encoding ?

  Thanks !

• Extract thumbnail from video in amazon s3 and store it in amazon s3 [closed]

  24 juin 2021, par Kanav Raina

  I want to extract thumbnail from video and store it on s3.

  


  import ffmpeg

url="https://link_to_s3_video.mp4"

(
    ffmpeg
    .input(url, ss='00:00:03')  
    .output("frame.png", pix_fmt='rgb24', frames='1')  
    .overwrite_output()
    .run()
)


  


  I am able to extract image but now how should I pass this image to file_upload function and store it on s3

  


  def file_upload(file, filename):
    link = f"https://{PUBLIC_BUCKET_NAME}.s3.us-east-2.amazonaws.com/images/{filename}"
    try:
        s3.Object(PUBLIC_BUCKET_NAME, f"images/{filename}").load()
    except ClientError as e:
        if e.response['Error']['Code'] == "404":
            try:
                s3_client.upload_fileobj(
                    file,
                    PUBLIC_BUCKET_NAME,
                    f"images/{filename}",
                    ExtraArgs={'ACL': 'public-read'}
                )

                return 200, link
            except ClientError as e:
                logging.error(e)
                return 500, ""
        else:
            return 500, ""
    else:
        return 409, link


  


  Thanks