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• How YouTube identifies if a movie is shaky [closed]

  28 novembre 2012, par MollyRazor

  After uploading a movie to Youtube, it analyzes the movie and if it's shaky, then it gives the option to correct it. The correction works with ffmpeg, but is there any open source method to analyze whether a movie is shaky ?

  I can't understand StackOverflow moderators. This place is full of self righteous bastards.

  Mr. Moderator says in a comment : ffmpeg is open source. O REALLY ? Then what parameters to use so ffmpeg outputs => yes, this is a shaky movie or no, this isnt. Ah, you can't answer that, so you close this question.

  Have you even read the question thoroughly ? Then do so again please. I think by the age of 50 you can correctly interpret what was written and what the question was.

  Thank you.

• ffmpeg encoding .mp4 fails in safari when hosted from s3. handbrake encoded video works first time

  11 juin 2018, par Simon Rogers

  The mp4 videos I’ve encoded with ffmpeg work perfectly in Safari if stored locally, but break if hosted from s3. I have tried countless encoding settings to no avail.

  However having just run a mov quickly through Handbrake and ticking ’optimise for web’ and encoding baseline @ 4.0, this has worked perfectly first time.

  I don’t understand what could be going wrong with my ffmpeg encoding.

  Things I have noticed about files from two separate encoders which work :

  They both have yuv420p(tv, bt709) whereas ffmpeg is just saying yuv420p – this is the only thing I can identify from ffprobe that is consistently different.

  I have done a fresh install of ffmpeg to no avail :

  ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

  brew install ffmpeg --with-fdk-aac --with-ffplay --with-freetype --with-libass  --with-libvorbis --with-libvpx --with-opus --with-x265

  This error appears in all the files I have encoded with ffmpeg :

  Unsupported codec with id 0 for input stream 1

  ––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––

  mp4box gives the following for the ffmpeg video, which doesn’t work :

   Tempuras-iMac:tests tempura$ mp4box -info /Users/tempura/tests/mov-output-10-1400.mp4
  
  * Movie Info *
  
  Timescale 1000 - 1 track
  
  Computed Duration 00:00:10.967 - Indicated Duration 00:00:10.967
  
  Fragmented File: no
  
  File suitable for progressive download (moov before mdat)
  
  File Brand isom - version 512
  
      Compatible brands: isom iso2 avc1 mp41
  
  Created: UNKNOWN DATE   Modified: UNKNOWN DATE
  
  File has no MPEG4 IOD/OD
  
  
  
  iTunes Info:
  
  Encoder Software: Lavf58.12.100
  
  1 UDTA types: meta (1) 
  
  
  
  Track # 1 Info - TrackID 1 - TimeScale 15360
  
  Media Duration 00:00:10.966 - Indicated Duration 00:00:10.966
  
  Track has 1 edit lists: track duration is 00:00:10.967
  
  Media Info: Language "English (eng)" - Type "vide:avc1" - 329 samples
  
  Visual Track layout: x=0 y=0 width=1800 height=1200
  
  MPEG-4 Config: Visual Stream - ObjectTypeIndication 0x21
  
  AVC/H264 Video - Visual Size 1800 x 1200
  
  AVC Info: 1 SPS - 1 PPS - Profile Baseline @ Level 4
  
  NAL Unit length bits: 32
  
  Pixel Aspect Ratio 1:1 - Indicated track size 1800 x 1200
  
  Chroma format YUV 4:2:0 - Luma bit depth 8 - chroma bit depth 8
  
  SPS#1 hash: 2BD106A8DFD73B92825D87D4D312B22F9CEC1986
  
  PPS#1 hash: 656AE5F3BE854F3C8B889E72310662390F18EDBD
  
  Self-synchronized
  
  RFC6381 Codec Parameters: avc1.42C028
  
  Average GOP length: 329 samples

  And gives the following for two videos that do work.

  First :

  Tempuras-iMac:tests tempura$ mp4box -info /Users/tempura/tests/mov-output-05-1400.mp4 
  
  [iso file] Unknown box type tmcd
  
  [iso file] Read Box type  (0x00000000) has size 0 but is not at root/file level, skipping
  
   * Movie Info *
  
  Timescale 1000 - 2 tracks
  
  Computed Duration 00:00:10.967 - Indicated Duration 00:00:10.967
  
  Fragmented File: no
  
  File suitable for progressive download (moov before mdat)
  
  File Brand isom - version 512
  
      Compatible brands: isom iso2 avc1 mp41
  
  Created: UNKNOWN DATE   Modified: UNKNOWN DATE
  
  File has no MPEG4 IOD/OD
  
  
  
  iTunes Info:
  
  Encoder Software: Lavf58.12.100
  
  1 UDTA types: meta (1) 
  
  
  
  Track # 1 Info - TrackID 1 - TimeScale 15360
  
  Media Duration 00:00:10.966 - Indicated Duration 00:00:10.966
  
  Track has 1 edit lists: track duration is 00:00:10.967
  
  Media Info: Language "English (eng)" - Type "vide:avc1" - 329 samples
  
  Visual Track layout: x=0 y=0 width=1800 height=1200
  
  MPEG-4 Config: Visual Stream - ObjectTypeIndication 0x21
  
  AVC/H264 Video - Visual Size 1800 x 1200
  
  AVC Info: 1 SPS - 1 PPS - Profile Baseline @ Level 4
  
  NAL Unit length bits: 32
  
  Pixel Aspect Ratio 1:1 - Indicated track size 1800 x 1200
  
  Chroma format YUV 4:2:0 - Luma bit depth 8 - chroma bit depth 8
  
  SPS#1 hash: 39D86732FD5F78B18F2E83C651FAE38EA0E30A6D
  
  PPS#1 hash: 656AE5F3BE854F3C8B889E72310662390F18EDBD
  
  Self-synchronized
  
  RFC6381 Codec Parameters: avc1.42C028
  
  Average GOP length: 329 samples
  
  
  
  Track # 2 Info - TrackID 2 - TimeScale 15360
  
  Media Duration 00:00:10.966 - Indicated Duration 00:00:10.966
  
  Track has 1 edit lists: track duration is 00:00:10.967
  
  Track is disabled
  
  Media Info: Language "Undetermined (und)" - Type "tmcd:tmcd" - 1 samples
  
  Unknown media type
  
  RFC6381 Codec Parameters: tmcd
  
  All samples are sync

  Second :

  Tempuras-iMac:tests tempura$ mp4box -info /Users/tempura/Documents/yes_2106.mp4 
  
  * Movie Info *
  
  Timescale 30000 - 1 track
  
  Computed Duration 00:00:10.966 - Indicated Duration 00:00:10.966
  
  Fragmented File: no
  
  File suitable for progressive download (moov before mdat)
  
  File Brand isom - version 1
  
      Compatible brands: isom avc1 mp42
  
  Created: GMT Fri Jun  1 11:24:54 2018
  
  Modified: GMT Fri Jun  1 11:24:54 2018
  
  
  
  File has root IOD (9 bytes)
  
  Scene PL 0xff - Graphics PL 0xff - OD PL 0xff
  
  Visual PL: ISO Reserved Profile (0x15)
  
  Audio PL: No audio capability required (0xff)
  
  No streams included in root OD
  
  
  
  Track # 1 Info - TrackID 1 - TimeScale 30
  
  Media Duration 00:00:10.966 - Indicated Duration 00:00:10.966
  
  Media Info: Language "Undetermined (und)" - Type "vide:avc1" - 329 samples
  
  Visual Track layout: x=0 y=0 width=1800 height=1200
  
  MPEG-4 Config: Visual Stream - ObjectTypeIndication 0x21
  
  AVC/H264 Video - Visual Size 1800 x 1200
  
  AVC Info: 1 SPS - 1 PPS - Profile Baseline @ Level 4.2
  
  NAL Unit length bits: 32
  
  Pixel Aspect Ratio 1:1 - Indicated track size 1800 x 1200
  
  Chroma format YUV 4:2:0 - Luma bit depth 8 - chroma bit depth 8
  
  SPS#1 hash: ED5CFE0A3F65F36ADCFA347C1273A29784E8AEAC
  
  PPS#1 hash: 7ECF7597FDDAC5F8C82B54BFB40A1F9A8D8807FA
  
  Self-synchronized
  
  RFC6381 Codec Parameters: avc1.42C02A
  
  Average GOP length: 329 samples

• Convert MP4 Version - FFmpeg

  17 mai 2017, par Luzwitz

  I have two mp4 File :

  1. out.mp4 : ISO Media, MP4 Base Media v1 [IS0 14496-12:2003]
  2. video/rio2016/finale/brasse/200.mp4 : ISO Media, MP4 v2 [ISO 14496-14]

  How can I convert 1 to 2 (mp41 to mp42) ?

  Thanks !