Questions tagged [lossless]
The lossless tag has no usage guidance.
74
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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?
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35
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6
answers
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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 ...
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19
votes
3
answers
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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 ...
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17
votes
2
answers
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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 ...
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16
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1
answer
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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 ...
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16
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2
answers
8k
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"Losslessly" trim an MP3 file [duplicate]
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 ...
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14
votes
1
answer
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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 ...
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13
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1
answer
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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 ...
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12
votes
1
answer
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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 ...
- 1,235
11
votes
3
answers
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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 ...
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11
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2
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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 ....
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11
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6
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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 ...
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11
votes
5
answers
6k
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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?
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2
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How to convert MKV videos to lossless MP4 videos that are compatible with iOS devices on Windows?
I’m new to FFmpeg (Windows), and need some help.
I want to convert my MKVs to MP4 with as little loss in quality as possible. The MKVs are made with MakeMKV and contain among others DTS soundtrack. ...
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votes
1
answer
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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 ...
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8
votes
1
answer
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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 ...
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votes
1
answer
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How do I achieve lossless JPEG joining without truncation of partial MCUs?
I am working on a project for which I need to join thousands of JPEG images losslessly (I'm not talking about the Lossless JPEG/JPEG 2000/JPEG-LS formats here).
Aforementioned images have varying ...
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votes
4
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Is it possible to convert JPEG to a lossless format and convert it back without losing quality?
Say I have a lossless version of an Image that is previously compressed in JPEG format (like if you open a JPEG image in mspaint and save it as BMP, I know that some metadata would be lost in this ...
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3
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How to convert videos to AV1 lossless using FFmpeg?
I have a set of AVI videos (lossless video streams; no audio) and my goal is to convert them to AV1 lossless using FFmpeg.
FFmpeg (with librav1e, libaom-av1 and libsvtav1 included) runs fine on my ...
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5
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1
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How to check if a FLAC file was made from MP3? [duplicate]
Possible Duplicate:
Finding out if a FLAC or WAVPACK audio file is NOT originally encoded from a lossy source
Sometimes I doubt that FLAC files are made from original music, because of deaf-dumb-...
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5
votes
1
answer
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How do I reinstall Windows 10, keeping existing apps and files?
After running a checkdisk and rebooting to repair files, Windows 10 now boots to a black screen with no mouse cursor. (Specifically, I restarted to perform a checkdisk, which completes to 100%, the ...
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2
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How to know the compression level of a PNG file and whether it is lossy?
Can I know whether a PNG file was compressed and how (at least, whether it was a lossless compression) in Windows? When I open the standard file properties dialog from the Windows Explorer, I see no ...
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4
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3
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3k
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How to apply audio track to a mute h264/mp4-video losslessly?
I have a MP4/h.264-video with no sound. With ffmpeg or similar, how can I apply an audio track to that MP4-file without degrading the quality of the video (i.e. without recoding the video-track)?
I'd ...
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4
votes
8
answers
3k
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Lossless DVD to avi?
I'm looking for a free or GPL program to rip DVDs to avi. I have AutoGK, but that only makes a compressed DVD. I want full quality, filesize be damned!
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4
votes
1
answer
3k
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Is TIFF with JPEG compression lossy?
Preview on the Mac can save a file to TIFF, but with JPEG compression:
Is this lossy? I'm confused because TIFF is usually lossless, but JPEG is lossy.
Maybe it is lossy, since the file size is 4MB ...
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4
votes
2
answers
459
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What are the basic components of an "audiophile" PC? [closed]
For the purpose of listening to lossless files (i.e., FLAC), is it simply a high quality sound card + high quality speaker?
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2
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lossless PNG to video in Imagemagick
As an intermediate step in creating an animation, I need to put a bunch of sequential PNGs into a movie file. I tried ffmpeg but was getting compression and artifacting even when I set quality to ...
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1
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Lossless Video Codec supporting Alpha Channels
Suppose I have a sequence of PNG image files which may or may not contain an alpha channel (assume those that do have an alpha channel actually utilize it). While PNG files themselves have their own ...
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How to correctly use x265 lossless parameter with avconv
x265 has a lossless mode which is used for ultra-high bitrates with zero loss of quality. I tried using this mode with avconv as follows:
avconv -i input.mp4 -c:v libx265 -x265-params lossless -c:a ...
- 1,754
3
votes
2
answers
7k
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Converting RGB images into lossless video with avconv / ffmpeg
I am trying to convert a series of PNG24 images containing a screen animation to a lossless video, so that every pixel is reproduced exactly as it was in the original. But avconv (and ffmpeg) both ...
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3
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Lossless rotation of photos using Windows Photo Viewer? (XP vs Win7)
If I wanted to rotate photos in XP using Windows Photo Viewer I was told, that it wasn't lossless rotation (so, worse quality in the rotated photo).
What about Win7 and Windows Photo Viewer? Is it ...
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3
votes
1
answer
794
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How to merge three mp4 files with same encoding/codex by Avidemux using command line?
Assume that one has three mp4 files with the same encoding/codex, say file1.mp4, file2.mp4, file3.mp4.
How can one merge these files into a single mp4 file, using command line by avidemux?
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votes
0
answers
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libx265 -crf transparency
I would like to know (even if it is subjective opinion) what is considered "transparency" when encoding with libx265. In other words, what value do I need to put after "-crf" to get a video that has ...
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0
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Edit MP4 Hex data to vertically or horizontally flip video in a lossless manner
I am trying to do something similar to the questions here and here, but with a small difference. I am trying to flip the video along the Y or X axes instead of doing a rotation.
The solution in those ...
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3
votes
0
answers
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FFMPEG Lossless Video Output Options
I am looking for lossless video output options from FFMPEG that can be viewed without any special codecs or special players such as VLC. I want a basic use to be able to open up the video with a ...
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2
votes
2
answers
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Do lossless audio files keep original quality when played (or only when converted back)?
I see a "lossless format" like FLAC defined often as one in which there is no loss of quality compared to the source file from which it was converted.
But does that mean that the original quality is (...
user162573
2
votes
1
answer
5k
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Huge file size difference between lossless HEVC and FFV1
I made a music video with a still image (input.jpg ≈ 1 MB) and a music (input.wav ≈ 20 MB) using FFmpeg. Why do I get such a huge difference in file size between the video generated with the lossless ...
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votes
1
answer
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How to remux/combine two MP4 files losslessly: One has video I want and the other has matching audio I want [duplicate]
I’d like to know if there's a way to remux/combine two MP4 video files.
They both have the exact same frame count. One is 1080p with no sound, the other is 720p with sound. I’d like to permanently ...
user1117595
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votes
1
answer
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How do I use OptiPNG on Windows to get a lossless file?
I simply what to use OptiPNG on Windows to create lossless versions of a folder full of PNGs file.
Is the following command sufficient?
optipng *.png
I've seen things about using the o7 option as ...
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2
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1
answer
882
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How can I losslessly concatenate two MP4 files and keep the telemetry information (GoPro GPMF) using FFmpeg?
One may losslessly concatenate two MP4 files using FFmpeg as follows:
ffmpeg -safe 0 -f concat -i list.txt -c copy output.mp4
with list.txt:
file 'C:\file1.mp4'
file 'C:\file2.mp4'
However, if the ...
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1
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Best way to convert BMP to PNG while maintaining quality?
Is this possible convert BMP to PNG while maintaining quality? I am trying to reduce the size of some albums that are in BMP, but still maintain the lossless quality.
Just tried XnConvert and setting ...
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2
votes
1
answer
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Slight file content difference due to LZW compression
In order to test if LZW compression is truly lossless I did the following:
I created a master uncompressed TIFF file.
Created an LZW compressed version of it
Saved that compressed TIFF back into an ...
user404162
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3
answers
4k
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FFMPEG: convert MP4 to same MP4 (in a different container) and add Subtitles
The main reason for this post is that I have movie.mp4 that I have downloaded an SRT for. When I manually add the SRT VLC uses its settings to change the font/size etc of the SRT. But if I Embed the ...
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3
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What constitues 24-bit FLAC?
I know there is 16-bit, then there is 24-bit. Now I know 24-bit is higher quality, but is there a difference is kbps or what?
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1
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FFMpeg image sequence to video using VP9 encoder
I'm trying to transcode mp4 to webm format in a lossless way. I tried two ways to do that.
For that purpose, I extracted mp4 video to image sequences (png). Then, I converted image sequence(without ...
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1
vote
1
answer
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Is there a compression method for compressing a group of very similar files, without archiving them?
I want to compress a large nuber of files that have near identical headers, and also some data, however I do not wish to archive them, nor do I wish to zip them individually(because the copression ...
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1
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What file format to use for photos? I will edit them. Then I will add text and make a PDF
I want to shoot a few photos using the smartphone. I will receive JPEG files. Next step I will move this photos to desktop computer (Windows 10 Home 64-bit). Now I want to edit this photos: some of ...
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vote
1
answer
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lossless video using FFmpeg ffv1 on jpeg images is not compressed but expanded
Is it possible for FFmpeg / ffv1.3 / mkv to create a lossless video is not larger than the sum of its parts (and if so, how) and if not, what is a good alternative to come close on size? The video ...
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1
vote
2
answers
5k
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Sound out of sync after merging multiple mp4 files with Avidemux
I am trying to join (merge) two or more .mp4 files together, without re-encoding.
Here is what I did:
Started Avidemux 2.5.5.
With File->Open, selected Input1.mp4.
I received this message - "H.264 ...
- 603
1
vote
0
answers
504
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In ffmpeg truehd encoder, can you mark L and R as LT and RT (Dolby Surround)
When encoding a stereo audio stream with the ffmpeg ac3 encoder, you can specify that the L/R channels are Dolby-Surround (Pro-Logic) LT/RT channels, using the -dsur_mode 2 flag.
Is there a way to do ...
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