26 May

Newest 'libx264' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/libx264

• 05:48
  How to check 'Output bit depth' of the libx264 library in ffmpeg? - Greg Newest 'libx264' Questions - Stack Overflow
  According to the x264 Encoding Guide, the crf scale depends on whether x264 is 8-bit or 10-bit. Supposedly x264 --help shows the Output bit depth. But on Windows ffmpeg -h full doesn't say anything about Output bit depth and the crf scale option is described as from -1 to FLT_MAX. How can I check if my ffmpeg is using 8-bit or 10-bit version of the libx264 library? -- x264 Encoding Guide

17 April

Newest 'libx264' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/libx264

• 13:03
  OpenCV VideoWriter using ffmpeg with "Could not open codec 'libx264'" Error - user2262504 Newest 'libx264' Questions - Stack Overflow
  I am new to OpenCV, and I want write Mat images into video using VideoWriter on Ubuntu 12.04. But when constructing VideoWriter, errors came out. It seems that OpenCV invoke ffmpeg API using default parameters and ffmpeg invoke x264 using its default parameters. Then these setting is broken for libx264. Thus the "Could not open codec 'libx264'" error. Anyone has ideas to solve this problem? More specifically: anyone knows where and how OpenCV invoke ffmpeg API? how to change ffmpeg default settings using code, hopefull, can be (...)

6 April

Newest 'libx264' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/libx264

• 06:04
  very low latency streaminig with ffmpeg using a webcam - userDtrm Newest 'libx264' Questions - Stack Overflow
  I'm trying to configure ffmpeg to do a real-time video streaming using a webcam. The ffmpeg encoder command I use is as follows. ffmpeg -f v4l2 -input_format yuyv422 -s 640x480 -i /dev/video0 -c:v libx264 -profile:v baseline -trellis 0 -subq 1 -level 32 -preset superfast -tune zerolatency -me_method epzs -crf 30 -threads 0 -bufsize 1 -refs 4 -coder 0 -b_strategy 0 -bf 0 -sc_threshold 0 -x264-params vbv-maxrate=2000:slice-max-size=1500:keyint=30:min-keyint=10: -pix_fmt yuv420p -an -f mpegts udp://192.168.1.8:5001 The ffplay command used to display the video (...)

1 April

Newest 'libx264' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/libx264

• 12:21
  How to set correct parameters for x264 lib - galuk Newest 'libx264' Questions - Stack Overflow
  I depacketize the H264 video fragments from an IP.RTP stream and save them to video.ivf file. After depacketizing i have only [SPS] ,[PPS] and [non-IDR slice]. I try to create IDR slice by using x264 lib. x264 lib creates IDR frame which consists of 0x000001[SPS nal type 7] 0x000001[PPS nal type 8] 0x0001[SE slice nal type 6] and 0x0001[I slice nal type 5]. How to set correct parameters for x264 lib if i have real SPS and PPS frames to get the same SPS and PPS frames i parse SPS and PPS but i don't know which parameters of x264_param_t param i should set. can someone give me (...)

21 March

Newest 'libx264' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/libx264

• 08:06
  How to transcode short video using FFmpeg, libx264 codec, Swift, iOS app - Dmitriy iOS Newest 'libx264' Questions - Stack Overflow
  The goal is to transcode a short video into .mov format using FFmpeg and libx264 codec. So far I have not been able to do this using third-party libraries. Using the command line, the video is perfectly transcoded, but I need it inside the application. If anyone has a solution I would be very grateful. The resulting video needs to have the following parameters, something like this: Picture 1 Picture 2 Picture 3 For example: let command = ["ffmpeg", "-i", videoOutputURL.path, "-c:v", "libx264", "-c:a", "copy", convertedVideoUrl.path] let ffmpegCommand = (...) -- FFmpeg, Picture 1, Picture 2, Picture 3

6 March

Newest 'libx264' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/libx264

• 23:24
  ffmpeg Connection to tcp://127.0.0.1:1935 refused on Windows 10 - Wissam Elias Newest 'libx264' Questions - Stack Overflow
  I am trying to re-stream an RTSP connection on the local network using this command: ffmpeg -loglevel debug -rtsp_transport tcp -i rtsp://192.168.1.13:1935 -codec copy -f rtsp rtsp://172.0.0.1:1935/live/stream but i am getting an error message: [tcp ⓐ 0000020c99c4c1c0] Connection to tcp://127.0.0.1:1935 failed: Connection refused rtsp://127.0.0.1:1935/live/stream: Connection refused while the port is not used and I've tried to use 8554 also with the same result, and the firewall on my device is turned (...)

23 February

Newest 'libx264' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/libx264

• 09:42
  Error Linking FFmpeg with libx264: Undefined Reference to __imp_x264_encoder_open_163 - zeyu Newest 'libx264' Questions - Stack Overflow
  I'm attempting to compile FFmpeg with libx264 support on Windows using MinGW-w64, but I'm encountering a linking error when building . The error points to an undefined reference to in . Here are the details of the error message:libavcodec/avcodec-57.dll__imp_x264_encoder_open_163libx264.o In fact, I want to run the AccMPEG branch from https://github.com/Alex-q-z/myh264.git, and I am looking to obtain an executable (exe) to run on Windows. LD libavcodec/avcodec-57.dll E:/MSY/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/13.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: (...) -- https://github.com/Alex-q-z/myh264.git

7 February

Newest 'libx264' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/libx264

• 16:27
  how to use x264 dll in another project - Hadi Rasekh Newest 'libx264' Questions - Stack Overflow
  I want to use x264 in my project. There is some line in the code said: `/* Application developers planning to link against a shared library version of libx264 from a Microsoft Visual Studio or similar development environment will need to define X264_API_IMPORTS before including this header. This clause does not apply to MinGW, similar development environments, or non Windows platforms. */` But I don't get this line: define X264_API_IMPORTS before including this header We can create x264 dll by its configuration and make ./configure (...)

31 January

Newest 'libx264' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/libx264

• 19:27
  GStreamer x264enc Buffered Frames are Sped-Up after EOS Event - user21956843 Newest 'libx264' Questions - Stack Overflow
  After sending EOS, the encoder sends its buffered frames down the pipeline, but the playback of those last ~2s of footage is sped up. Pipeline: autovideosrc [avfvideosrc] ! clockoverlay ! videoconvert ! video/x-raw,format=I420 ! x264enc bframes=0 bitrate=512 ! video/x-264,stream-format=avc,alignment=au,framerate=20/1 ! kvssink The application plays the pipeline for 10s, then sends an EOS event on the source element. The custom sink kvssink streams frames to cloud storage, the playback of this 10s of footage is fine except for the encoder's ~2s of buffered (...)

15 January

Newest 'libx264' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/libx264

• 08:39
  How to write a video file using FFmpeg - Summit Newest 'libx264' Questions - Stack Overflow
  I am trying to write a video file using FFMPEG but i get the following errors [libx264 ⓐ 000002bdf90c3c00] broken ffmpeg default settings detected [libx264 ⓐ 000002bdf90c3c00] use an encoding preset (e.g. -vpre medium) [libx264 ⓐ 000002bdf90c3c00] preset usage: -vpre -vpre [libx264 ⓐ 000002bdf90c3c00] speed presets are listed in x264 --help [libx264 ⓐ 000002bdf90c3c00] profile is optional; x264 defaults to high This is my code #pragma warning(disable : 4996) extern "C" #include #include #include #include int (...)

2 December

Newest 'libx264' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/libx264

• 22:38
  FFMPEG, want to encode 720x480 and automatically scale to 640x480 or 854x480 as necessary depending on the ratio - boxylogan Newest 'libx264' Questions - Stack Overflow
  EDIT: See appended notes at the bottom of the post. Note: all MKVs are sourced from my original Farscape Starburst DVDs, MPEG2. I've been slowly re-encoding my old TV shows into a crisper format and I have for some shows, mainly extras (but also full episodes) MKVs that are a mix of 4:3 and 16:9. Usually I open the files up in Mediainfo and find out which ones are 4:3, stick them in one folder to encode in 640x480, then the same with 16:9. It's worked fine for the umpteen amount of times I've had to encode my shows. I would like to try to expedite the process (...)

18 October

Newest 'libx264' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/libx264

• 18:52
  ffmpeg memory leak when opening libx264 encoder - ksb496 Newest 'libx264' Questions - Stack Overflow
  I have spotted a memory leak issue when I use the libx264 encoder in the FFmpeg C API. Specifically, when it comes to deallocate memory after encoding a video. After tracking the factor that causes it, I realized that it happens after invoking avcodec_open2, which allocates some memory that afterwards cannot be freed. Once the video is processed, calling avcodec_close and then avcodec_free_context does not entirely free all the allocated memory. After some investigation, I found out that the problem could be located in AVCodecContext::priv_data being allocated but not being freed (...)

6 October

Newest 'libx264' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/libx264

• 11:07
  Why does moviepy complain about bitrate while generating audiofile? - Roman Newest 'libx264' Questions - Stack Overflow
  I have just try to use moviepy library for the first time. Generation of movies from numpy arrays was really simple, intuitive and worked out of box. This is what I tried: from moviepy.editor import VideoClip import numpy as np def make_frame(t): val = int(255.0*(t/3.0)) ls = [] for height in range(100): row = [] for width in range(300): row.append([val,0,0]) ls.append(row) frame = np.array(ls) return frame animation = VideoClip(make_frame, duration = (...)

5 October

Newest 'libx264' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/libx264

• 10:21
  ffmpeg video has no preview/thumbnail with codec H.265 - Eva Silviana Newest 'libx264' Questions - Stack Overflow
  I have videos with large file size. I want to reduce the file size and I found this answer https://unix.stackexchange.com/a/38380/587749 ffmpeg -i input.mp4 -c:v libx265 output.mp4 It works perfectly, my video file size becomes smaller. But, my problem is that the video doesn't have a preview when I want to send it to WhatsApp. Am I missing some additional settings? Because, there are no problems when using video codec libx264 The image below is an example: Red area is video file with Codec H.265 and green area is video file with Codec H.264 (as you (...) --

4 October

Newest 'libx264' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/libx264

• 08:01
  broken ffmpeg default settings detected - Ramakrishna Newest 'libx264' Questions - Stack Overflow
  I am getting broken ffmpeg error while VideoWrite using X264 Fourcc codec.I have install all the dependencies.How can I rectify this problem.The sample code that I have been using is as follows. VideoWriter oVideoWriter ("path.mp4", CV_FOURCC('X','2','6','4'), 15, frameSize, false); Operating system : Ubuntu 14.04 64-bit Console Error: [libx264 ⓐ 0x8d6220] broken ffmpeg default settings detected [libx264 ⓐ 0x8d6220] use an encoding preset (e.g. -vpre medium) [libx264 ⓐ 0x8d6220] preset usage: -vpre (...)

3 October

Newest 'libx264' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/libx264

• 03:51
  FFMPEG (libx264) "height not divisible by 2" - Andy Hin Newest 'libx264' Questions - Stack Overflow
  I am trying to encode a .mp4 video from a set of frames using FFMPEG using the libx264 codec. This is the command I am running: /usr/local/bin/ffmpeg -r 24 -i frame_%05d.jpg -vcodec libx264 -y -an video.mp4 I sometimes get the following error: [libx264 ⓐ 0xa3b85a0] height not divisible by 2 (520x369) After searching around a bit it seems that the issue has something to do with the scaling algorithm and can be fixed by adding a -vf argument. However, in my case I don't want to do any scaling. Ideally, I want to keep (...)

25 September

Newest 'libx264' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/libx264

• 23:19
  x264/x265 options for fast decoding while preserving quality - user3301993 Newest 'libx264' Questions - Stack Overflow
  I want to encode some videos in H264 and H265, and I would like to ask for help in order to chose the adequate options in x264/x265. My first priority is video quality. Lossless would be the best quality for example My second priority is fast decoding speed (ie: I would like faster decoding without sacrificing quality) fast decoding for me means that the decoding machine would use less CPU resources reading the resulting video Less RAM consumption would be a plus Latency is not important I don't care that much if the output file ends up (...) -- x265 doc

21 August

Newest 'libx264' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/libx264

• 19:15
  FFmpeg: Audio is sped up after compressing AVI video [closed] - Karen S Newest 'libx264' Questions - Stack Overflow
  I have an AVI video and I want to reduce the file size. When I run the FFmpeg command below, the resulting audio in the video is sped up, and the last bit of the video has no audio. The FFmpeg command ffmpeg -i "in.avi" -vcodec libx264 -acodec copy -crf 26 -vf "scale=-1:'min(720,ih)', yadif=1" out.avi The output messages ffmpeg version 2023-06-11-git-09621fd7d9-full_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers built with gcc 12.2.0 (Rev10, Built by MSYS2 project) configuration: --enable-gpl --enable-version3 --enable-static (...)

1 August

Newest 'libx264' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/libx264

• 10:32
  asm SIMD sniffer - Андрей Тернити Newest 'libx264' Questions - Stack Overflow
  There is x264. It use a lot of x86 asm files. For example pixel-32.asm. This files can use different SIMD instruction set: mmx, 3DNow!, sse family, others I need the simple way to automatically analyze every file. I want get which SIMD family in which file are used. How? I think every asm file must contain information about which SIMD family it use (or information that no SIMD). Without this information it is very bad idea try to use this files... I am angry, my x86 CPU support mmx and 3DNow! only, but x264 try call sse, so I get "Illegal instruction" sometimes. I (...) -- x264, pixel-32.asm, can, issues, mirror

8 June

Newest 'libx264' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/libx264

• 08:02
  Android h264 decode non-existing PPS 0 referenced - nmxprime Newest 'libx264' Questions - Stack Overflow
  In Android JNI, using ffmpeg with libx264 use below codes to encode and decode raw rgb data!. I should use swscale to convert rgb565 to yuv420p as required by H.264. But not clear about this conversion.Please help, where i am wrong, with regard the log i get! Code for Encoding codecinit()- called once(JNI wrapper function) int Java_com_my_package_codecinit (JNIEnv *env, jobject thiz) avcodec_register_all(); codec = avcodec_find_encoder(AV_CODEC_ID_H264);//AV_CODEC_ID_MPEG1VIDEO); if(codec->id == AV_CODEC_ID_H264)  (...)

7 June

Newest 'libx264' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/libx264

• 18:57
  Flutter PNG screenshots are not working properly with FFMPEG - segga Newest 'libx264' Questions - Stack Overflow
  I'm trying to convert screenshots I took in my flutter app programmatically to an .mp4 video, but the video is just black/blank. I'm using PNG to encode the images saved and the .PNG extension too. This is the code base I'm currently using and I expected to be able to use these images with ffmpeg. I also tried the ImageFormat.rawRgba or so but I don't think I used that properly import 'dart:io'; import 'package:flutter/rendering.dart'; void captureScreenshot() async try RenderRepaintBoundary boundary = (...)