[packman] [FFMpeg] Webm: Codec is experimental but not enabled?

[Marguerite Su]

Hi,

I'm using the FFMpeg from Packman Factory repository.

When I want to convert a youtube-dl downloaded webm video to mp4,

ffmpeg -i input.webm output.mp4

It complains:

Codec is experimental but experimental codecs are not enabled, try -strict -2

Full Log:

Input #0, matroska,webm, from
'圍棋入門教學第一課圍棋棋具(影片出處-網路御書房http:--zhangbotta.idv.tw).webm':
  Duration: 00:05:13.83, start: 0.000000, bitrate: 175 kb/s
    Stream #0:0: Video: vp8, yuv420p, 480x360, SAR 1:1 DAR 4:3, 6 fps,
6 tbr, 1k tbn, 1k tbc (default)
    Stream #0:1: Audio: vorbis, 44100 Hz, stereo, s16 (default)
using SAR=1/1
[libx264 @ 0x2564d20] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
[libx264 @ 0x2564d20] profile High, level 2.1
[libx264 @ 0x2564d20] 264 - core 128 - H.264/MPEG-4 AVC codec -
Copyleft 2003-2012 - http://www.videolan.org/x264.html - options:
cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1
psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1
8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2
threads=3 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1
interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2
b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250
keyint_min=6 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf
mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40
aq=1:1.00
[NULL @ 0x2596c40] Codec is experimental but experimental codecs are
not enabled, try -strict -2
Output #0, mp4, to 'go1.mp4':
    Stream #0:0: Video: h264, yuv420p, 480x360 [SAR 1:1 DAR 4:3],
q=-1--1, 90k tbn, 6 tbc (default)
    Stream #0:1: Audio: none, 44100 Hz, stereo, flt, 128 kb/s (default)
Stream mapping:
  Stream #0:0 -> #0:0 (vp8 -> libx264)
  Stream #0:1 -> #0:1 (vorbis -> aac)
Error while opening encoder for output stream #0:1 - maybe incorrect
parameters such as bit_rate, rate, width or height

But our FFMpeg has enabled `--libvpx --libvorbis`, so what's wrong with it?

The webm video I used is uploaded here:

https://docs.google.com/file/d/0BxDr3WQseygRTjVtZTNSZ0dRTDA/edit?usp=sharing


Thanks.

Marguerite