Hello,
I am trying to convert Canon MJPEG to MP4 (h264/AAC) but after conversion, the
start of the audio is cut and sound is not synchronized.
ffmpeg -i mjpeg.avi -c:v libx264 -preset slow -crf 13 -pix_fmt yuvj420p -c:a
libfdk_aac -b:a 192k output.mp4
or
ffmpeg -async 1 -i mjpeg.avi -avoid_negative_ts 0 -c:v libx264 -preset slow
-crf 13 -pix_fmt yuvj420p -c:a libfdk_aac -b:a 192k output.mp4
If I convert just audio, the aac file is fine (not cut)
ffmpeg -i mjpeg.avi -c:a libfdk_aac -b:a 192k output.aac
Here you have INPUT and OUTPUT properties (I see problem with start in mp4
file?):
INPUT: CanonMVI02
Duration: 00:00:14.30, start: 0.000000, bitrate: 14883 kb/s
Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p(pc,
bt470bg/unknown/unknown), 640x480, 14823 kb/s, 30 fps, 30 tbr, 30 tbn, 30 tbc
Stream #0:1: Audio: pcm_u8 ([1][0][0][0] / 0x0001), 11024 Hz, 1 channels, u8,
88 kb/s
OUTPUT
Duration: 00:00:14.49, start: 0.185760, bitrate: 11124 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc),
640x480, 11197 kb/s, 30 fps, 30 tbr, 1000k tbn, 60 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 11025 Hz, mono, fltp, 66
kb/s (default)
Metadata:
handler_name : SoundHandler
Thanks for help
Peter
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