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Questions tagged [lossless]

74 questions
39
votes
4 answers

Lossless extraction of streams from WebM

I would like to extract streams from WebM video files without converting them (re-compression), can somebody recommend any software that can allow this?
Karolinger
  • 1,001
35
votes
6 answers

What is the difference between WAV and FLAC?

My understanding is that the WAV and FLAC formats are containers for lossless audio. I have seen the FLAC format as being perhaps better because it is able to losslessly compress audio from say a WAV file. However today I noticed that bleep is…
Zombo
  • 1
19
votes
3 answers

Is there any quality difference between PNG vs BMP image formats?

I have just learned that PNG is a lossless image format while BMP can be both uncompressed or lossless format. Should there be a quality difference between these two? If not, does it mean that other lossless formats like TIFF, JPEG2000 and PNG offer…
user1032421
  • 307
18
votes
2 answers

lossless concatenation of ogg vorbis files

I have a couple of ogg vorbis files, all encoded with the exact same properties that I want to concatenate into a single file. I know that the ogg vorbis format supports plain concatenation of multiple files like: $ cat file1.ogg file2.ogg >…
josch
  • 988
17
votes
1 answer

Producing lossless video from set of .png images using ffmpeg

I have a set of .png images that I would like to animate into a movie using ffmpeg on macOS, but when I look at the video produced the quality is always compressed and the resulting video has artifacts when the original image does not. Here is an…
algol
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16
votes
2 answers

"Losslessly" trim an MP3 file

I have got an mp3 file, let's say it is 25 minutes long. I understand that any software is capable of extracting the first 20 minutes of the file as a new MP3 file. However, I would like to find a solution that would do this "loss-lessly", i.e.,…
yo'
  • 519
14
votes
1 answer

Is it possible to change orientation of JPG image without rotating it (and thus losing information)?

As JPG is a lossy compression, every re-encoding losses quality. Thus, 90/180/270 degree rotation is a lossy operation as well. Is it possible to change orientation of JPG photo by changing some of its metadata tags so that the orientation can be…
Tomas
  • 8,080
13
votes
1 answer

Will editing an MP3 harm the quality?

I recently recorded something in MP3 — I should have done FLAC, but it’s way too late — and I wanted to edit those soundtracks from 5 minutes to about 2 minutes each. I edit in Audacity. Will loading it, removing about half the track, and exporting…
Nick Bailuc
  • 397
13
votes
6 answers

How to adjust .mkv files audio volume level?

I have a bunch of .mkv video files which audio is REALLY low volume. How can i adjust the volume higher permanently in the .mkv file? preferrably with lossless methods (if even possible?). Yes, i know i could just turn my speakers full volume, but…
winuser
  • 367
12
votes
1 answer

Possible to rotate video (.MOV/H.264/AVC) losslessly?

The iPhone (3GS, 4, 4S, etc) often records video upside-down but then includes metadata about the rotation inside the MOV container. However, many applications (XBMC, VLC, Windows Media Player) do not understand this rotation metadata and so the…
SofaKng
  • 1,285
12
votes
5 answers

OS X: How to perform a lossless crop of a JPEG image?

I'm looking for a simple way to losslessly crop JPEGs on Mac OS X. Particularly, is there some way to get Preview to perform a lossless crop?
GJ.
  • 10,151
11
votes
2 answers

Understanding conversion and (de)compression of lossless audio

I have a few questions concerning lossless audio. I'm considering ripping my entire music collection to lossless .flac, but I want to understand a few things about it first. If I have a file that is .flac, and I want to make it into, say, .wav, how…
Ryan McClure
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11
votes
2 answers

Using ffmpeg + MPDecimate to get rid of exact duplicate frames (i.e. losslessly)

According to the documentation, mpdecimate will "Drop frames that do not differ greatly from the previous frame in order to reduce frame rate." I would like to be able to remove only exact duplicate frames from a video. I know the video has a ton of…
JohnDoughmaker22
  • 147
11
votes
1 answer

What is the different of h264 and libx264

I notice there is argument available for --enable-encoder=h264,libx264 suppose I am converting the video looselessly Which one default ffmpeg will use? h264 or libx264? And how about the quality different beteen this 2? I don't care about file size…
Med Lexo
  • 131
11
votes
3 answers

Finding out if a FLAC or WAVPACK audio file is NOT originally encoded from a lossy source

Is there a way of checking that the so-called FLAC or WAVPACK audio file was originally encoded from a lossless source (WAV, CDA, APE, etc.) instead of a lossy source (MP3, AAC, ATRAC, etc.)? Say I have a lossy MP3 audio file (5.17Mb, 87% compressed…
cornel
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