4 articles

17 avril

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 (...)

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 (...)

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 (...)

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