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  • MP4 Embedded Thumbnail with FFMpeg

    25 janvier 2018, par MDK

    I have a MP4 I have used FFMpeg to strip the extra streams out of so it will properly play on my TV via DLNA. I however have noticed the Thumbnail is not missing. It looks like it was embedded as a stream of type MJPEG with 1 frame. When I attempt to copy that stream as well I can a message

    Timestamps are unset in a packet...

    The file will play on VLC afterwards but no other media players. Is there a way to migrate this data over

    Thanks

  • ffmpeg / avconv slideshow with transitions

    23 janvier 2015, par KravAn

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  • How to correct faulty aspect ratio with FFMPEG when encoded in both stream and container

    14 mai, par Kurt Fitzner

    I have a video that I converted from the original in a way that seems to have poisoned the aspect ratio. The intended aspect ratio is 12:5 (2.4.:1) at 1920x800 with square pixels, but the cuda scale seems to have adjusted the storage aspect ratio.

    


    The video was created with :

    


    ffmpeg -analyzeduration 1000000000 -probesize 100G -loglevel warning -stats -hwaccel cuda \
  -hwaccel_output_format cuda -y -i "UHDSOURCE.mkv" -map 0:v? -c:v hevc_nvenc \
  -preset p7 -2pass true -multipass fullres -rc vbr -rc-lookahead 55 -b:v 1000k -minrate 0 -maxrate 3000k \
  -bufsize 120000k -vf crop=3840:1600:0:280,scale_cuda=1920:800 -metadata title="HDDEST" \
  -map 0:a:2 -c:a:0 aac -b:a:0 160k -map 0:a:4 -c:a:1 aac -b:a:1 96k \
  -map 0:s? -c:s copy -map_metadata 0 "HDDEST.mkv"


    


    The original was 16:9 letterboxed, and the above command seems to have decided the SAR should reflect that. The result is a video with :

    


    Stream #0:0(eng): Video: hevc (Main 10), yuv420p10le(tv, bt2020nc/bt2020/smpte2084), 1920x800 [SAR 20:27 DAR 16:9], SAR 27:20 DAR 81:25, 23.98 fps, 23.98 tbr, 1k tbn (default)


    


    I can get halfway to fixing this with :

    


    ffmpeg -i HDDEST.mkv -aspect 12:5 -c copy HDDEST_ASPECT.mkv


    


    But the resultant video still shows two different SAR and DARs. Some players use one, some players insist on the 16:9, though :

    


    Stream #0:0[0x1](eng): Video: hevc (Main 10) (hev1 / 0x31766568), yuv420p10le(tv, bt2020nc/bt2020/smpte2084), 1920x800 [SAR 20:27 DAR 16:9], 1072 kb/s, SAR 1:1 DAR 12:5, 23.98 fps, 23.98 tbr, 16k tbn, Start 0.021000 (default)


    


    Q1 : What are the two aspect ratio displays ? I think one of them is the file globally and one of them is the stream, but can get no clear answer

    


    Q2 : How to correct this without re-encoding ? The disc this came from was damaged when my burner was knocked off the table.

    


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