[FFmpeg-user] Warning: VBV buffer size not set

[Hans Carlson]

On Wed, 12 Dec 2018, Carl Eugen Hoyos wrote:

> 2018-12-08 22:28 GMT+01:00, Ulf Zibis <Ulf.Zibis at gmx.de>:
>
>> with:
>> ffmpeg -i "concat:CYD-001.vob|CYD-002.vob|..." -c copy CYD_copy.vob
>> I get the warning:
>> [svcd @ 0x56377151e140] VBV buffer size not set, using default size of 130KB
>> If you want the mpeg file to be compliant to some specification
>> Like DVD, VCD or others, make sure you set the correct buffer size
>>
>> How can I aviod the warning?
>
> Use the target option.

If the target option is used WITHOUT "-c copy", then it's true you won't 
see this warning.  But then it's doing a re-encode... NOT a copy.  The 
problem comes when trying to do a COPY and the target option doesn't help 
in that case.

So, I'll rephrase Ulf's original question... how do you avoid this warning 
while doing a stream COPY (remux)?

FYI.  You get the same result here with or without "-target XXX".

   $ ffmpeg -i TEST.mpg -target ntsc-dvd -codec copy -f vob - > /dev/null
   ffmpeg version N-92681-g0e833f615b Copyright (c) 2000-2018 the FFmpeg developers
     built with gcc 7 (GCC)
     configuration: --disable-optimizations --disable-stripping --enable-static --disable-shared --disable-ffplay
     libavutil      56. 24.101 / 56. 24.101
     libavcodec     58. 42.100 / 58. 42.100
     libavformat    58. 24.100 / 58. 24.100
     libavdevice    58.  6.101 / 58.  6.101
     libavfilter     7. 46.101 /  7. 46.101
     libswscale      5.  4.100 /  5.  4.100
     libswresample   3.  4.100 /  3.  4.100
   Input #0, mpeg, from 'TEST.mpg':
     Duration: 00:00:09.88, start: 0.533367, bitrate: 142 kb/s
       Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x480 [SAR 32:27 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
   [vob @ 0x4000e00] VBV buffer size not set, using default size of 230KB
   If you want the mpeg file to be compliant to some specification
   Like DVD, VCD or others, make sure you set the correct buffer size
   Output #0, vob, to 'pipe:':
     Metadata:
       encoder         : Lavf58.24.100
       Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x480 [SAR 32:27 DAR 16:9], q=2-31, 6000 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 29.97 tbc
   Stream mapping:
     Stream #0:0 -> #0:0 (copy)
   Press [q] to stop, [?] for help
   [vob @ 0x4000e00] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
   frame=  300 fps=0.0 q=-1.0 Lsize=     172kB time=00:00:09.94 bitrate= 141.7kbits/s speed=4.21e+03x
   video:169kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.759272%