Questions tagged [lossless]

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Concatenate H.264 raw but basic streams without reencoding or quality loss

How does one go about concatenating several H.264 raw streams into one without reencoding or quality loss? The streams lacked any advanced features and represented contuous recording. There is no ...
0
votes
1answer
12 views

How to convert the DVD .VOB collection to MPEG without re-encoding (and quality loss)?

How to convert the DVD .VOB collection to MPEG without re-encoding (and quality loss)? The .MPEG files are what DVD format is built upon, the singular files are easy to handle, and overall, can be ...
0
votes
1answer
21 views

How to cut MPEG and H.264 files frame-accurately without re-encoding?

Occasionally, the video-files need to be cut to keep only the relevant parts. Thus, how does one go about cutting the common video files (H.264, MPEG) without any re-encoding and thus quality loss?
5
votes
3answers
3k views

Using ffmpeg to add height (as black bars) to video file without quality loss

I have a file of resolution 3840x1632, but my TV stretches the picture vertically to fill up all 2160 pixels of height. Is it possible to use ffmpeg to add blank / black height, while preserving the ...
23
votes
2answers
35k views

Convert mp4 to webm without quality loss with ffmpeg

What is the best way to convert a mp4 file to webm without quality loss (using vp8 or vp9) with ffmpeg? If I do ffmpeg -i in.mp4 out.webm the quality is very bad. I can specify a target bitrate via -...
1
vote
1answer
1k views

x265: Is it possible to re-compress HEVC video without quality loss?

My situation: Transcoding 1080p bluray videos to HEVC. Audio untouched; My rig is old (pre-2012) and to speed up the process I'm using --preset ultrafast; From x265 documentation, I understand that ...