fedora ffmpeg转换视频

ls图错了

ffmpeg -i ~/下载/第78课时2.avi ~/78.mp4
转换mp4报错

转换mkv成功了

Input #0, avi, from '/home/xy/下载/第78课时2.avi':
Metadata:
encoder : Lavf52.31.0
Duration: 00:31:19.12, start: 0.000000, bitrate: 253 kb/s
Stream #0:0: Video: mpeg4 (Simple Profile) (xvid / 0x64697678), yuv420p, 724x376 [SAR 1:1 DAR 181:94], 6 tbr, 6 tbn, 6 tbc
Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 22050 Hz, stereo, s16p, 64 kb/s

Input #0, matroska,webm, from '/home/xy/78.mkv':
Metadata:
ENCODER : Lavf54.63.104
Duration: 00:31:19.45, start: 0.000000, bitrate: 128 kb/s
Stream #0:0: Video: h264 (High), yuv420p, 724x376 [SAR 1:1 DAR 181:94], 6 fps, 6 tbr, 1k tbn, 12 tbc (default)
Stream #0:1: Audio: vorbis, 22050 Hz, stereo, fltp (default)

shell 命令批量从处理
呢马，早忘记了

转换mp4出错
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The encoder 'aac' is experimental but experimental codecs are not enabled, add '-strict -2' if you want to use it.
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正确命令
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ffmpeg -i 第78课时2.avi -strict -2 第78课时2.avi.mp4
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mp4的信息
大小没有怎么变化 40多M
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '第78课时2.avi.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf54.63.104 Duration: 00:31:19.17, start: 0.046440, bitrate: 202 kb/s Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 724x376 [SAR 1:1 DAR 181:94], 80 kb/s, 6 fps, 6 tbr, 12288 tbn, 12 tbc Metadata: handler_name : VideoHandler Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 22050 Hz, stereo, fltp, 119 kb/s Metadata: handler_name : SoundHandler
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