On 08/01/2022 23:43, amindfv--- via ffmpeg-user wrote:
On Sat, Jan 08, 2022 at 08:20:46PM +0000, MacFH - C E Macfarlane - News wrote:
To select parts of a video, I use ...
FFMPEG -ss <start-time> -i <input> -codec copy -to <end> <output>
... however it's tedious, because with this method the video will only break
at certain points between compression units (can't remember the proper
terminology), and it can take some experimentation to find the precise
timing of these to get the audio right as well, and often, because of the
way the compression works, the first extracted frame is often an unwanted
last frame of a previous scene.
I have long lamented that FFMPEG doesn't make this both easier and to allow
greater resolution, if necessary recreating the start and end compression
units to get the exact timing wanted.
If you get rid of the "-codec copy" you can have any precision you'd like.
But the entire video will be re-encoded, which is undesirable because,
as the codecs use lossy compression, there will be further degradation
of the entire video clip just gain some precision at each end.
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