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• Edited video produces smaller image that original, even with higher resolution

  10 juillet 2020, par ceperman

  I've a .ts format recording from my Humax, which completely fills the window horizontally when played with VLC. In full-screen it fills the screen horizontally in letterbox style, and the same on the TV when played through my PS/3. All good so far.

  


  This is the ffprobe output :

  


  Duration: 02:16:37.72, start: 74238.902878, bitrate: 2554 kb/s
Stream #0:0[0x931]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv), 704x576 [SAR 16:11 DAR 16:9], max. 15000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc


  


  I used ffmpeg to change the audio track :

  


  ffmpeg -i movie.ts -c:v libx264 -c:a ac3 -crf 20 -map 0:v:0 -map 0:a:1 movie.mp4


  


  and produced an .mp4 which also plays correctly.

  


  ffprobe :

  


  Duration: 02:16:37.68, start: 0.005333, bitrate: 1129 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 704x576 [SAR 16:11 DAR 16:9], 932 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)


  


  However, if I edit it using OpenShot, I cannot find any export format that produces an image that fills the window horizontally in the same way, regardless of what resolution or aspect ratio I use.

  


  Example : export format "DV/DVD Widescreen PAL (720x576)" produces this (sample) file :

  


  Duration: 00:00:39.12, start: 0.040000, bitrate: 563 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x576, 477 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)


  


  OpenShot appears not to set the AR, so it initially shows in VLC in 5:4 aspect, but even changing the VLC AR to the maximum of 2.39:1 does not stretch it fully from side-to-side.

  


  I've used ffmpeg to experiment with changing the aspect ratio, changing the resolution, and setting the SAR and DAR, all without success.

  


  This can't be a resolution issue, as I've exported 720p and 1080i, plenty of pixels but all produce roughly the same result - a small image that doesn't fill the window, and ditto on the TV. The original recording is only 704x576 but fills the window. Also the aspect ratio of the original recording is 16:9 (VLC agrees) but the actual measured AR of the screen image is closer to 2.04:1.

  


  I'm hoping that while this could be an OpenShot issue, the cause of the problem should be visible to ffprobe and perhaps fixable with ffmpeg. Help wil be appreciated.

  


• 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.