FFmpeg的修剪.3gp使用，並保存爲.MP4​​不工作

Question

我想剪輯視頻輸入名爲.3gp（http://www.sample-videos.com/video/3gp/144/big_buck_bunny_144p_2mb.3gp），並將其保存爲.MP4​​，這是我的命令：

ffmpeg -ss 00:00:00.000 -y -i input_vid.3gp -strict experimental -preset ultrafast -t 00:00:03.637 -r 30 -s 176x144 -ar 44100 -b:v 4000k -minrate 4000k -maxrate 4000k -c:a copy -vcodec mpeg4 output_vid.mp4

但它給我以下錯誤：

Setting 'pix_fmts' to value 'yuv420p' 
query_formats: 7 queried, 6 merged, 0 already done, 0 delayed 
w:176 h:144 fmt:yuv420p sar:12/11 -> w:176 h:144 fmt:yuv420p sar:12/11 flags:0x4 
Automatically choosing VBV buffer size of 232 kbyte 
intra_quant_bias = 0 inter_quant_bias = -64 
Could not find tag for codec amr_nb in stream #1, codec not currently supported in container 
Output #0, mp4, to 'output_vid.mp4': 
    Metadata: 
    major_brand  : 3gp4 
    minor_version : 512 
    compatible_brands: isomiso23gp4 
    encoder   : Lavf56.23.100 
    Stream #0:0(und), 0, 1/15360: Video: mpeg4 ([0][0][0]/0x0020), yuv420p, 176x144 [SAR 12:11 DAR 4:3], q=2-31, 4000 kb/s, 30 fps, 15360 tbn, 30 tbc (default) 
    Metadata: 
     creation_time : 1970-01-01 00:00:00 
     handler_name : VideoHandler 
     encoder   : Lavc56.25.100 mpeg4 
    Stream #0:1(und), 0, 1/8000: Audio: amr_nb (samr/0x726D6173), 8000 Hz, mono, 12 kb/s (default) 
    Metadata: 
     creation_time : 1970-01-01 00:00:00 
     handler_name : SoundHandler 
Stream mapping: 
    Stream #0:0 -> #0:0 (h263 (native) -> mpeg4 (native)) 
    Stream #0:1 -> #0:1 (copy) 
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument 
exit_program: 1 

但它工作正常，如果輸入的是一個.MP4 ...

任何想法的？副本到-c：感謝

Answer 1

由-c改變音頻編解碼器固定我的問題一個AAC