[FFmpeg-user] -vtag 'xvid' broken in 4.1

[Reindl Harald]

that worked over many years now and with 4.1 "[mp4 @ 0x5618adfe4b80]
Could not find tag for codec mpeg4 in stream #0, codec not currently
supported in container"

/usr/local/bin/ffmpeg -hide_banner -i
'/mnt/data/autotest/parts/ffmpeg/demo.mp4' -y -vb '448k' -ab '96k' -bt
'64k' -maxrate '544k' -ar '44100' -ac '2' -r '25' -vf
'scale=480:266,setdar=16/9,pad=480:270:0:2:000000' -async '1' -f 'mp4'
-codec:v 'mpeg4' -codec:a 'aac' -strict 'experimental' -cutoff '15000'
-vtag 'xvid' -threads '4' -metadata 'creation_time=2018-11-08T13:13:16'
'/mnt/data/autotest/parts/ffmpeg/targets/test.xvid' >>
'/mnt/data/autotest/parts/ffmpeg/logs/mp4_xvid.log' 2>>
'/mnt/data/autotest/parts/ffmpeg/logs/mp4_xvid.log'

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
'/mnt/data/autotest/parts/ffmpeg/demo.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    creation_time   : 1970-01-01T00:00:00.000000Z
    encoder         : Lavf52.31.0
  Duration: 00:00:20.24, start: 0.000000, bitrate: 654 kb/s
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 /
0x31637661), yuv420p, 720x400 [SAR 80:81 DAR 16:9], 553 kb/s, SAR 79:80
DAR 711:400, 25 fps, 25 tbr, 25 tbn, 50 tbc (default)
    Metadata:
      creation_time   : 1970-01-01T00:00:00.000000Z
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz,
stereo, fltp, 96 kb/s (default)
    Metadata:
      creation_time   : 1970-01-01T00:00:00.000000Z
      handler_name    : SoundHandler
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> mpeg4 (native))
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
-async is forwarded to lavfi similarly to -af
aresample=async=1:min_hard_comp=0.100000:first_pts=0.
[mpeg4 @ 0x5618adfed880] Automatically choosing VBV buffer size of 86 kbyte
[mp4 @ 0x5618adfe4b80] Could not find tag for codec mpeg4 in stream #0,
codec not currently supported in container
Could not write header for output file #0 (incorrect codec parameters
?): Invalid argument
Error initializing output stream 0:0 --