avthumb参数vcodec格式及解释
http://developer.qiniu.com/code/v6/api/dora-api/av/avthumb.html
参数/vcodec/<VideoCodec>：视频编码方案，支持方案：libx264 ，libvpx ，libtheora ，libxvid ，libvpx-vp9 等。
| videoEncoders | description |
|---|---|
| a64multi | Multicolor charset for Commodore 64 (codec a64_multi) |
| a64multi5 | Multicolor charset for Commodore 64, extended with 5th color (colram) (codec a64_multi5) |
| amv | AMV Video |
| asv1 | ASUS V1 |
| asv2 | ASUS V2 |
| avrp | Avid 11 10-bit RGB Packer |
| avui | Avid Meridien Uncompressed |
| ayuv | Uncompressed packed MS 4444 |
| bmp | BMP (Windows and OS/2 bitmap) |
| cljr | Cirrus Logic AccuPak |
| dnxhd | VC3/DNxHD |
| dpx | DPX image |
| dvvideo | DV (Digital Video) |
| ffv1 | FFmpeg video codec # 1 |
| ffvhuff | Huffyuv FFmpeg variant |
| flashsv | Flash Screen Video |
| flashsv2 | Flash Screen Video Version 2 |
| flv | FLV / Sorenson Spark / Sorenson H.263 (Flash Video) (codec flv1) |
| gif | GIF (Graphics Interchange Format) |
| h261 | H.261 |
| h263 | H.263 / H.263-1996 |
| h263p | H.263+ / H.263-1998 / H.263 version 2 |
| libx264 | libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 RGB (codec h264) |
| libx265 | libx265 H.265 / AVC / MPEG-4 AVC / MPEG-4 part 10 RGB (codec h265) |
| libaom-av1 | Alliance for Open Media AV1 |
| huffyuv | Huffyuv / HuffYUV |
| jpeg2000 | JPEG 2000, |
| jpegls | JPEG-LS |
| ljpeg | Lossless JPEG |
| mjpeg | MJPEG (Motion JPEG) |
| mpeg1video | MPEG-1 video |
| mpeg2video | MPEG-2 video |
| mpeg4 | MPEG-4 part 2 |
| libxvid | libxvidcore MPEG-4 part 2 (codec mpeg4) |
| msmpeg4v2 | MPEG-4 part 2 Microsoft variant version 2 |
| msmpeg4 | MPEG-4 part 2 Microsoft variant version 3 (codec msmpeg4v3) |
| msvideo1 | Microsoft Video-1 |
| pam | PAM (Portable AnyMap) image |
| pbm | PBM (Portable BitMap) image |
| pcx | PC Paintbrush PCX image |
| pgm | PGM (Portable GrayMap) image |
| pgmyuv | PGMYUV (Portable GrayMap YUV) image |
| png | PNG (Portable Network Graphics) image |
| ppm | PPM (Portable PixelMap) image |
| prores | Apple ProRes |
| prores_aw | Apple ProRes (codec prores) |
| prores_ks | Apple ProRes (iCodec Pro) (codec prores) |
| qtrle | QuickTime Animation (RLE) video |
| r10k | AJA Kona 10-bit RGB Codec |
| r210 | Uncompressed RGB 10-bit |
| rawvideo | raw video |
| roqvideo | id RoQ video (codec roq) |
| rv10 | RealVideo 1.0 |
| rv20 | RealVideo 2.0 |
| sgi | SGI image |
| snow | Snow |
| sunrast | Sun Rasterfile image |
| svq1 | Sorenson Vector Quantizer 1 / Sorenson Video 1 / SVQ1 |
| targa | Truevision Targa image |
| libtheora | libtheora Theora (codec theora) |
| tiff | TIFF image |
| utvideo | Ut Video |
| v210 | Uncompressed 422 10-bit |
| v308 | Uncompressed packed 444 |
| v408 | Uncompressed packed QT 4444 |
| v410 | Uncompressed 444 10-bit |
| libvpx | libvpx VP8 (codec vp8) |
| libvpx-vp9 | libvpx VP9 |
| wmv1 | Windows Media Video 7 |
| wmv2 | Windows Media Video 8 |
| xbm | XBM (X BitMap) image |
| xface | X-face image |
| xwd | XWD (X Window Dump) image |
| y41p | Uncompressed YUV 411 12-bit |
| yuv4 | Uncompressed packed 420 |
| zlib | LCL (LossLess Codec Library) ZLIB |
| zmbv | Zip Motion Blocks Video |
| copy | 编码与同原始视频 |
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