lossless trim h264 video file to sync with second camera - FFmpeg? -


i have several (e.g two) cameras taking video , wanna have output files synchronized. since start not exactly, suppose done trim start of video started recording first.

i want have trimmed video lossless possible, wanna copy streams output file.

since ffmpeg can't copy accurate when copying, think workaround encode start of video next first keyframe hi-quality (e.g. crf 16) , copy rest, concat them together.

could give me advice how make or better?

there seems pitfalls gop , audio relative delay.

thanks in advance


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