Questions tagged [encoding]

The process and techniques used when storing moving images, sound, metadata and other streams as a digital file.

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11 views

vlc file format encoding issues

I am trying to figure out how to convert video and audio format with VLC. I'm trying to convert a 64 kbps mp3 to a 64 kbps ogg. The UI for encoding gives the options for audio as the following: ...
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Build FFmpeg with “.EXE” files of external libraries?

this is my first question on StackExchange! I recently got into building FFmpeg on Windows and build successfully the vanilla and the external library versions of this program! I noticed that it only ...
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Best export settings for still image with audio

Suppose I have a sequence in Premiere which is an audio track accompanied by a single still non-moving image (e.g. a song and the album art). Being that there is no video (or motion of any kind), what ...
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Stream video using FFmpeg with minimum writes reads to disk

We are streaming a video using a 30 instances of docker containers hosted on Azure each instance running FFmpeg. The problem is that Azure limits the reads/writes that a container can do. Is there a ...
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compare two video then cut the different

I have 2 video files with the same content, but coming from a different source. They have a slight difference in 'cut' and language dubbing, meaning one can be missing a shot compared to the other. I ...
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Script works on some files in batch but not others, any advice?

I'm trying to convert a batch of (mostly) .mxf files (4 channels of audio) to .mp4 files (stereo audio) taking the first two channels from the source using the following script: #!/bin/zsh for i in *....
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Final cut pro export file size is huge (despite the small size of the initial video) - how can I shrink it?

I'm a complete novice at final cut. I have recorded a dnd game over zoom, it's a 2 hour video, the file saved from zoom is 756mb. I have edited it a bit (just minor stuff, add a couple of images, ...
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ffmpeg - Slow down video and loop/repeat audio

I am trying to use ffmpeg to slow down a video speed by 25% (75% speed) without changing the audio speed. ffmpeg -i input_video.mkv -filter:v "setpts=1.3*PTS" "SlowVideo25.mp4" On ...
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Is there a hardware acceleration for audio encoding?

Video encoding with HW acceleration takes way less time than audio encoding. Is there a way to convert ac3 to aac faster?
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Do modern devices support decoding 4:4:4 pixel formats?

I am recording and distributing relatively low motion screen content (not games). Using h264, fine text often appears very blurry due to the poor subsampling with 4:2:0 and 4:2:2 pixel formats. With 4:...
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Hevc Transparent Channel? (Apple WWDC19)

So, Up until now, HEVC Supported Transparent. But there wasn't any encoding Software To Encode that Transparent Pixels in it. Until Apple made their Own Way of Putting Alpha pixels inside a consumer ...
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Trim Audio Only of a Video file - FFMPEG

I have a mkv file containing a Video 1 minute shorter than audio. I want to Cut out first 1 Minute of Audio Stream. How Would I accomplish That With ffmpeg? I tried -ss 00:01:00.000, But that also ...
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Does HEVC Support 16-Bit RGB Color Format?

I have some 3D Rendered Frames in 16-bit rgba Color Format.... I don't Wanna Lose Any Data... Because I have to Use those in editing.... But With Thousands of Frames in 4K File Size Matters.... So Why ...
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Scale Video, Without 'ffmpeg Scaler' converting colorspace from RGBA to YUV

I have a video in RGBA space contained in MPNG codec. Which is in 4K. I need to Convert that into a 1080p File... SO i Used this - ffmpeg -i input.mkv -vcodec libx265 -vf scale=1920:1080 -sws_flags ...
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severe artifacts pixelation when using cuda rendering premiere pro

In premiere pro when I set the renderer to GPU Acceleration (CUDA), for the timeline and on media encoder export, half the video is completely messed up with lots of pixelation artifacts when I switch ...
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What SOFTWARE could I use to encode to this spec?

Thanks in advance! It's an mpeg transport stream in a .ts wrapper. Layout would be as follows: Video (MPEG2, 80Mbps, CBR, All I Frame,422@HL) Audio1 (Track1/PID1) 1 pair LPCM(SMPTE 302M)48kHz Audio2 ...
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ffmpeg 4.2.3 error, Could not find codec parameters for stream 4 (Unknown: none): unknown codec:

ffmpeg 4.2.3 error, Could not find codec parameters for stream 4 (Unknown: none): unknown codec: This error is for gopro videofiles, where they can processed very fine with different ffmpeg command......
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How to change orientation 180 degrees to only two videofiles out of multiple, with compression to happen only once?

How to merge with ffmpeg multiple action camera (gopro) video files (eg. 30+) into one, and change the orientation 180 degrees to only two of these video files with encoding / compression to happen ...
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converting video to m1v

I am having an issue with converting a 1920x1080 video to m1v format. In the past I have used XMediaRecode for the task, but for some reason there is a persistent bug which prevents me from changing ...
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What is video hinting?

I've just faced with such thing as hinting videos. Quick research showed me something about the fact that it makes "streaming better" and something about QuickTime Streaming Server. That wasn't really ...
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How to H.265 to H.264 without losing quality

I have a MPEG-H Part2/HVEC (H.265) .mkv file (Planar 4:2:0 YUV 10-bit LE). Since my LG PF 1500 beamer does not read H.265 but H.264 I would like to convert it (HVEC -> H.264). I think handbrake is a ...
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Post-production editing audio/video out of sync

I am trying to add two videos using ffmpeg and the output video/audio is out of sync (and fast forwarded). Goal is to put intro.mp4 before the original file clip.flv My approach is to Change the ...
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ffmpeg log missing “dup” and “drop” key-value pairs

For some reason, my ffmpeg output log does not show dup and drop key-value pairs. expect: ... frame=563 fps=138 q=23.0 size=13056kB time=00:00:09.42 bitrate=11346.8kbits/s dup=0 drop=0 speed= 2.3x .....
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FFMPEG: is it possible to offset output frames from a selection of specific frames?

I'm doing some ffmpeg (4.1.3) transcodings by extracting specific frames from the source, in this case, the source can be either a movie or an image sequence, all working fine with the following ...
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FFmpeg merge two files from different sources with different bitrates

I have created an intro video with Adobe Premiere Pro and I want to add the intro video to my downloaded Mixer stream videos before uploading them to YouTube, without reencoding the complete video ...
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27 views

Encode a small proxy file with multiple audio streams for editing on Linux

After capturing 2K video in 444p with OBS, I need to transcode it to a low quality proxy version that's still easy to scrub and not a huge file. I capture 3 audio tracks in 32-bit PCM and the image ...
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ffmpeg pad and rotate - colour differential on upload to youtube

I'm using ffmpeg to rotate a square video to the desired angle, and then pad it from 1250x1250 to 2300 x 1293 (16:9). I use the following set of commands: ffmpeg -i input.mp4 -vf "rotate=-74*PI/180" ...
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Another question on Non-monotonous DTS in output stream

I use ffmpeg to convert and join multiple mp3 files into m4a. BITRATE=128k find . -name "*.mp3" | parallel --lb -k "ffmpeg -y -i {} -map 0:a -c:a aac -b:a $BITRATE {.}.m4a" OUT_NAME=${OUT_NAME:=out....
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How to export a video that is playable in WhatsApp?

I'm editing a video and want it to be playable inside WhatsApp. I've tried some configurations but when I send the video as a WhatsApp message, it always goes as an annexed document. The user can ...
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Editing issues with variable framerate input footage (Whatsapp videos)

I have to make a video for social media, mixing several short clips which have been sent to me via Whatsapp. I'm using Da Vinci Resolve 16. When taking the videos into the timeline, I get several ...
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ffmpeg rtmp server connection issues

I am trying to stream using ffmpeg rtmp using, ffmpeg -i out2.mp4 -c:v copy -c:a aac -listen 1 -ar 44100 -ab 64000 -f flv rtmp://localhost/live The process starts but nothing is happening after ...
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Extending the length of a video and overlaying an alpha PNG image sequence using FFMPEG

I’ve got several videos to which I’d like to add ‘outro’ animations to, using FFMPEG. The outro animation itself is a sequence of 41 frames of alpha PNG images named consecutively, from Outro.00000....
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What does “top coded first (swapped)” mean in ffmpeg output?

I am attempting to convert a 1080i top first H.264 video to another with interlacing maintained. But when I look at the output, after setting these flags: -top 1 -flags +ildct+ilme -x264-params ...
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VMAF wrong results using SVT-AV1 encoder

I have a source video (source.mkv, which is a 25fps 1080p x264 encoded video), and I have reencoded it using SVT-AV1, like this: ffmpeg -i source.mkv -nostdin -f rawvideo -pix_fmt yuv420p - | ...
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Delta encoding for video files?

I have a very high quality video and I need to produce a high quality and a low quality version for transport into other systems. For the high quality version I use a lossy compression (currently ...
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What is the practical effect of x265 HEVC -tune fastdecode (vs. x264 without fastdecode)?

I have some still shots from a security camera. I want to reduce the archive size while keeping the details. I use -qb for encoding rather than -crf because -crf blurs the moving objects. I am ...
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ffmpeg adds two seconds of unwanted silence at end of video [duplicate]

I am creating a video file from a single image, and audio. Though, after running conversion the resulting video file is the audio track's length, plus two seconds. The audio codec does not affect ...
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Convert mp4 for different resolutions for playing using his

How do I transcode my mp4 video to different resolutions and create m3u8 for all for adaptive streaming
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How to configure B-frames (with no leading P-frames) in x265

I have been rolling around with my studies in x265 encoder for days by following this online x265 docs and this article. But I cannot figure out how to set the x265 encoder to code only I- and B-...
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850 views

Is there a way to improve h264_nvenc output quality?

I'm compressing some videos for archiving, and I came to this configuration which gives me a nice overall quality on a small size: ffmpeg -threads 4 -y -hide_banner -i input.mp4 -vf scale=-2:480 -c:v ...
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944 views

Combining two live RTMP streams into another RTMP stream, synchronization issues (with FFMPEG)

I'm trying to combine (side by side) two live video streams coming over RTMP, using the following ffmpeg command: ffmpeg -i "rtmp://first" -i "rtmp://first" -filter_complex "[0v][1v]xstack=inputs=2:...
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Is there any “concatenable” video format I can use for sequential streaming?

I'm writing a server and I have to play commercials on demand, so I'm trying to avoid re encoding video. I assume that video containers have headers and meta data, so it would not be possible. Is ...
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How to split an mp4 into original ts segments?

I have a *.mp4 file that was concatenated from a bunch of improperly ordered *.ts files. I'd like to extract original segments from the *.mp4 without encoding and manual cuts. Is it possible and if so,...
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Can I make m4v files “better” before archiving? (adding keyframes, or lossless optimization, or ?) [closed]

I've got a decent bitrate DVD rip of an animated TV series, and before sending it to it's forever home (currently my PS3's extra HD space), I was wondering: can you take existing m4v files and make ...
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Online VPS or Dedicated, Seedbox Video Encoding Help

I have a few questions. When I was younger I use to encode lots of old Animes for fansub teams and do Karaokes on my PC. My PC is currently out dated and do not have the space nor the power to do my ...
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83 views

Issues with transcoding to a MXF container

I'm new here, so hi to all :). I'm new to FFmpeg too, and I'm trying to transcode a HEVC file to a mxf file and I'm having some issues. The original file is a rip I made from a Bluray HDR movie a ...
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25 views

merging videos results in a messed up output

I'm trying to merge 2 videos with the same resolution and codecs but on the merged output only the first part (first video) works correctly and as soon as it ends there's a static image of the ending ...
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54 views

Can I manually delete frames from a video file like mkv/mp4 without using any video editor?

If I have a video file from which I want to delete/jump/skip a certain scene... Can this be done manually? I mean I know there are a ton of software (both FOSS & proprietary) which can achieve ...
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1k views

How to tell ffmpeg to copy all streams except one audio stream (to encode)?

Input: * One Video * 4 audio streams * Many subtitles * Chapters I want to re-encode one of the audio streams (the first one) and keep everything else as-of (copy). Is it possible to do that in ...
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Is VAAPI the same as hardware encoding?

I don't know if this is the place to ask, it's a bit of a hybrid video/IT/developer question, so my apologies if it is not. I scoured the entire internet and can't find an answer to this question! I'...

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