Questions tagged [lossless]

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How to set x265 encoding to lossless using FFmpeg API?

I know I can set up the lossless mode for x265 as follows: ffmpeg -i input.mp4 -c:v libx265 -x265-params lossless=1 output.mp4 How can I do this using the FFmpeg API?
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52 views

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 ...
2
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1answer
723 views

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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1answer
61 views

Is the operating system playing lossless audio?

Considering we have a lossless audio player, and a lossless audio recorder both of which are digital (meaning the audio does not ever go through an analog cable) we should be able to play back the ...
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1answer
108 views

Is it possible for ffmpeg to select audio channels without reencoding

I use this command to try and downmix an audio file without re-encoding but the channel selection is not done : $ time ffmpeg -i input.aac -c:a copy -map_channel 0.0.0 -map_channel 0.0.0 output.aac -...
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0answers
359 views

Lossless H.264 MOV cannot be opened with Quicktime

I believe that this question is not the same as Lossless H.264 MP4 file created from images cannot be played in QuickTime because that question, and its answer, pertains to converting a series of PNG ...
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0answers
38 views

Are .blk files containing video lossless? Do they have a standardized codec?

I have a few .blk files, and I want to convert them to something of equal quality. All variants I've tried so far degrade the quality, even if I enter a high bitrate in the quality settings. Now I ...
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1answer
99 views

Variable framerate lossless video from yuv422 images

I've been pulling my hair lately with FFmpeg commandline. Be aware that I am not an FFmpeg expert. Here is my problem: I have a bunch of YUV422 images as such: image0.yuv image1.yuv .. image450.yuv ...
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330 views

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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0answers
37 views

ffmpeg transcode loss information [closed]

I have a system taking videos of various formats as input and transcoding them into the same format for storage and processing and semantic analysis such as object detection. First, I wonder is this ...
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1answer
62 views

Is there a way to tell ffmpeg “encode file A with format settings of file B?”

I know I could use ffprobe and then parse the text file to get the codec info of file B, but is there a simpler way? Goal: I want to append a few seconds of silence to hundreds of audio files (who ...
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0answers
67 views

FFmpeg losslessly deconstruct video then losslessly re-encode

I need to dump all the frames losslessly from a h.265 mkv video, along with the audio track in FLAC 24bit (initially it was encoded from the source in FLAC 24bit). I then need to edit some frames and ...
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1answer
1k views

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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1answer
103 views

Does editing a lossy format without converting to another format file hurt quality?

I've heard that converting a file from one lossy format to another one further reduces quality. That makes sense! But what happens if I edit a lossy file and export using the same file format, does ...
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1answer
1k views

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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2answers
218 views

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 (...
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1answer
572 views

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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2answers
5k views

“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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1answer
29k views

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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3answers
3k views

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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1answer
5k views

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 ...
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1answer
2k views

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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2answers
2k views

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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1answer
1k views

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 ...
2
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1answer
112 views

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 ...
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0answers
8k views

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 ...
12
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1answer
518 views

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 ...
11
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2answers
2k views

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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1answer
3k views

Best audio converter for flac to alac? [closed]

I just got a new phone with a lot more space. This means I can put my lossless audio on... trouble is, iTunes doesn't support flac.... There is alac, but I have yet to find a quality converter to ...
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1answer
2k views

Improve ffmpeg command for MKV to MP4 for iPad?

I have many MKVs made from DVDs and BRs by MakeMKV that I converting to MP4 so I can play/stream on my iPad Air. I now use this command for converting my MKVs to MP4: ffmpeg -i input.mkv -strict ...
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1answer
44k views

ffmpeg: Converting MKV to MP4 lossless

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 contains among others DTS soundtrack. ...
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1answer
1k views

Convert shn to flac with one command in CLI?

Everywhere I've googled they always convert shn to wav, and then to flac. It's really uncomfortable. How can I convert shn to flac withing one line?
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2answers
6k views

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 ...
29
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5answers
99k views

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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3answers
2k views

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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1answer
1k views

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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2answers
429 views

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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2answers
6k views

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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2answers
414 views

AAC 256kbit to MP3 320kbit conversion. I know it's lossy, but how?

Has anyone ever transcoded music from a high-quality aac to an mp3 (or vice-versa). The internet is full of people who say this should never be done, but apart from the theoretical standpoint that you ...
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1answer
93 views

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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3answers
5k views

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?
27
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4answers
22k views

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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2answers
4k views

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 ...
12
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3answers
83k views

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 ...
0
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1answer
4k views

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 ...
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1answer
15k views

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 ...
2
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3answers
3k views

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 ...
0
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1answer
436 views

Importing WAV CDs into iTunes without conversion

I would like to import some audio CDs into iTunes, keeping their Audio CD (WAV) format because they had been previously burned from MP3s, so they don't lose too much quality. How can I do this?
6
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4answers
24k views

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 ...
10
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5answers
4k views

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?