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• How to get information of dropped frames and resolution of the played video from Video player like VLC

  7 juillet 2020, par Ashutosh Singla

  I was playing 360° videos using whirligig player for my subjective test and I was wondering how can I get the information of dropped frames and resolution of video played by the player. 
The source resolution of the video is 1080p, and the frame rate is 30fps

  



  When I watching videos on YouTube, I am able to derive the above information by right clicking and looking at the 'stats for nerds' option - see example below :

  



  

  



  But didn't get the required information for the videos played on whirligig player such as dropped frames, actual bitrate playable on the player and playable resolution.

  



  Any suggestions ?

  


• Batch resizing videos to specific resolution with ffmpeg

  9 juin 2020, par tjk

  I need to resize all mp4 videos in a folder to a specific resolution. It is a vertical video that must be exactly 360x640px. Input videos can be of different resolutions, aspect ratios, vertical or horizontal. I am very new to this and so far I only got to this :

  



  for i in *.mp4; do ffmpeg -i "$i" -vf "scale='if(gt(a*sar,16/9),360,640*iw*sar/ih)':'if(gt(a*sar,16/9),360*ih/iw/sar,640)',pad=360:640:(ow-iw)/2:(oh-ih)/2,setsar=1" "converted/${i%.*}.mp4"; done


  



  When running this with 16 videos one of them (400x672px) won't resize with this error in log :

  



  [Parsed_pad_1 @ 0x7fd760548c00] Input area -10:0:370:640 not within the padded area 0:0:360:640 or zero-sized
[Parsed_pad_1 @ 0x7fd760548c00] Failed to configure input pad on Parsed_pad_1
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0
[aac @ 0x7fd76280da00] Qavg: 15546.137
[aac @ 0x7fd76280da00] 2 frames left in the queue on closing


  



  Please help to fix this.

  


• Mencoder error - merging two video files with same fps, resolution and codec failed

  26 mai 2020, par Estatistics

  Mencoder error in linux - merging two video files with same fps, resolution and video and audio codec failed.

  



  These video files had different fps ratios, video codecs, and Audio codecs but same resolution. I made them to have the same codec by using the below ffmpeg command line per video :

  



  ffmpeg -i D1_vid.mp4 -c:v libx264 -refs 3 -x264-params b-pyramid=2   -acodec aac -b:a 327680  D1_video.mp4


  



  However, even i made them to have many other aspects the same ones (e.g. ref frames) according to MediaInfo, they failed to merged under Mencoder :

  



  ` mencoder -oac pcm -ovc copy -o video_out.avi D1_video.mp4 D2_video.mp4


  



  It is the different overall bit rate ? How I fix that maintaining all other aspects that are presented by MediaInfo in Linux equal ?

  



  

  



  output by Mencoder

  



  MEncoder 1.3.0 (Debian), built with gcc-7 (C) 2000-2016 MPlayer Team
success: format: 0  data: 0x0 - 0x2be37eba
libavformat version 57.83.100 (external)
libavformat file format detected.
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f70ecf872a0]Protocol name not provided, cannot determine if input is local or a network protocol, buffers and access patterns cannot be configured optimally without knowing the protocol
[lavf] stream 0: video (h264), -vid 0
[lavf] stream 1: audio (aac), -aid 0, -alang und
VIDEO:  [H264]  1280x720  24bpp  29.583 fps  4278.2 kbps (522.2 kbyte/s)
[V] filefmt:44  fourcc:0x34363248  size:1280x720  fps:29.583  ftime:=0.0338
==========================================================================
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
libavcodec version 57.107.100 (external)
AUDIO: 48000 Hz, 1 ch, floatle, 239.1 kbit/15.57% (ratio: 29890->192000)
Selected audio codec: [ffaac] afm: ffmpeg (FFmpeg AAC (MPEG-2/MPEG-4 Audio))
==========================================================================
videocodec: framecopy (1280x720 24bpp fourcc=34363248)
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
Pos:1301.6s  38506f (99%) 1492.89fps Trem:   0min 784mb  A-V:0.020 [4278:767]
success: format: 0  data: 0x0 - 0x208dfde4
libavformat file format detected.
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f70ecf872a0]Protocol name not provided, cannot determine if input is local or a network protocol, buffers and access patterns cannot be configured optimally without knowing the protocol
[lavf] stream 0: video (h264), -vid 0
[lavf] stream 1: audio (aac), -aid 0, -alang eng
VIDEO:  [H264]  1280x720  24bpp  29.583 fps  3085.4 kbps (376.6 kbyte/s)
[V] filefmt:44  fourcc:0x34363248  size:1280x720  fps:29.583  ftime:=0.0338
==========================================================================
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
AUDIO: 48000 Hz, 1 ch, floatle, 220.0 kbit/14.32% (ratio: 27498->192000)
Selected audio codec: [ffaac] afm: ffmpeg (FFmpeg AAC (MPEG-2/MPEG-4 Audio))
==========================================================================
videocodec: framecopy (1280x720 24bpp fourcc=34363248)
videocodec: framecopy (1280x720 24bpp fourcc=34363248)

All video files must have identical fps, resolution, and codec for -ovc copy.