16 June

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

• 07:43
  FFmpeg av_read_frame not reading frames properly? - Sir DrinksCoffeeALot Newest 'ffmpeg' Questions - Stack Overflow
  Alright, so I've downloaded some raw UHD sequences in .yuv format and encoded them with ffmpeg in .mp4 container (h264 4:4:4, 100% quality, 25fps). When i use ffprobe to find out how many frames are encoded i get 600, so that's 24 secs of video. BUT, when i run those encoded video sequences through av_read_frame i only get like 40-50% of frames processed before av_read_frame returns error code -12. So I'm wild guessing that there are some data packages in middle of the streams which get read by av_read_frame and forces a function to return -12. What my questions are, how should i deal (...)
• 06:34
  My Video Filesize Does Not Equal Bitrate x Time - Sixtoo Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to use ffmpeg to encode some videos with h264. I'm trying to hit a target filesize. My code is: D:\\SOFTWARE\\ffmpeg\\bin\\test\\ffmpeg.exe -i "%~1" -c:v libx264 -preset veryslow -b:v 200k -an "%~n1.mp4" The video is 15 seconds long. So I've read that my filesize should be 200 x 15 (bitrate x duration). But it's not. The filesize is 400kb, when it should be 3000kb. What gives?
• 03:21
  av_seek_frame() Can't seek to the place I want - alexander chen Newest 'ffmpeg' Questions - Stack Overflow
  I want to intercept a frame of my video file, so I used the av_seek_frame function, the timestamp value I tried using timestamp*AV_TIME_BASE and timestamp/(av_q2d(videostream->time_base)*av_TIME_BASE), but no matter what I use Which one, the obtained frame is always not what I want, and it is observed that the frame time that I want is very different (so the accuracy problem of AVSEEK_FLAG_BACKWARD is excluded here). My code is as follows: double tmp0 = timeStamp/(av_q2d(inputVideoStream->time_base)*AV_TIME_BASE); // double tmp0 = timeStamp * AV_TIME_BASE; code = (...)
• 03:03
  FFMPEG mp4 from http live streaming m3u8 file? [closed] - thiago.adriano26 Newest 'ffmpeg' Questions - Stack Overflow
  How Can I extract mp4 from http live streaming m3u8 file? I Tried this command below: ffmpeg -i input file -f rawvideo -bsf h264_mp4toannexb -vcodec copy out.mp4 I took this error: [NULL ⓐ 0000000002f07060] Packet header is not contained in global extradata, corrupted stream or invalid MP4/AVCC bitstream Failed to open bitstream filter h264_mp4toannexb for stream 0 with codec copy: I
• 02:02
  FFMPEG Streaming using RTMP - desto Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to create a stream using ffmpeg to send a video to a Red5 Server. I've already managed to do this using this command: ffmpeg -re -y -i "Videos\\Video1.mp4" -c:v libx264 -b:v 600k -r 25 -s 640x360 -t 40 -vf yadif -b:a 64k -ac 1 -ar 44100 -f flv "rtmp://192.168.0.12/live/videostream" My problem is, when ffmpeg finishes encoding the video, it stops the stream, and thus cuts the video short for 5-10 seconds (for short videos), but this gets worse on larger videos. Is there a way to stop this behavior? I was trying to add a blank 10 second video before and after the original video, (...)

15 June

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

• 23:02
  How to convert raw H.264 stream from video call to mp4 file - Daniel Newest 'ffmpeg' Questions - Stack Overflow
  I have captured a SIP point to point video call using wireshark and I used the program 'videosnarf' on Ubuntu 12.04 to extract the raw H.264 stream from the PCAP. I am having some problems with ffmpeg when trying to convert it to MP4. Below is the ffprobe output: [STREAM] index=0 codec_name=h264 codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 codec_type=video codec_time_base=1/2400000 codec_tag_string=[0][0][0][0] codec_tag=0x0000 width=704 height=396 has_b_frames=0 sample_aspect_ratio=1:1 display_aspect_ratio=16:9 pix_fmt=yuv420p level=51 r_frame_rate=25/1 avg_frame_rate=25/1 (...)
• 21:42
  Can't synchronize frame from two webcam streams side by side using ffmpeg - Peppe Newest 'ffmpeg' Questions - Stack Overflow
  i'm trying to stream two webcam in sbs mode using ffmpeg websocket. It works but there is a delay of some second between the two scene. Here is what I do : ffmpeg -f v4l2 -framerate 30 -video_size 1280x720 -input_format mjpeg -i /dev/video1 -f v4l2 -framerate 30 -input_format mjpeg -video_size 1280x720 -i /dev/video0 -filter_complex " [0:v][1:v]hstack [left+right]" -map [left+right] -r 30 -fflags nobuffer -f mpegts -codec:v mpeg1video -s 2560x720 -b:v 800k -bf 0 http://localhost:8081/secretsecret And this is the output: ffmpeg version 4.1.3-0ubuntu1 Copyright (c) 2000-2019 the FFmpeg (...)
• 17:35
  Reading RTCP packets from an IP camera using FFMPEG - Didac Perez Parera Newest 'ffmpeg' Questions - Stack Overflow
  I am using the ffmpeg C library. I need to intercept RTCP packets from the camera in order to get the timestamp from the Sender Report. Is there any method or structure in the ffmpeg that gives me this information? I am completely stuck but I am not able to solve that problem. Any help will be appreciated. Thanks in advance,
• 16:35
  How can I correctly provide a mock webcam video to Chrome? - doppelgreener Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to run end-to-end testing in Chrome for a product that requires a webcam feed halfway through to operate. From what I understand this means providing a fake webcam video to Chrome using the --use-file-for-fake-video-capture="/path/to/video.y4m" command line argument. It will then use that as a webcam video. However, no matter what y4m file I provide, I get the following error from Chrome running under these conditions: DOMException: Could not start video source code: 0, message: "Could not start video source", name: "NotReadableError" Notably I can provide an audio file (...) -- the Chromium file that explains fake video capture, the example y4m file list, TestRTC
• 14:51
  I want to know what is in unknown [WARNING: Unknown codec unknown] - aomi taka Newest 'ffmpeg' Questions - Stack Overflow
  I want to new music_bot in my discord.ch so I found google cloud platform and Just-some-bot in git hub (https://github.com/Just-Some-Bots/MusicBot) I did just fallow to step ubuntu 16.04 in this site (https://just-some-bots.github.io/MusicBot/installing/ubuntu/) and I got a problem There was no problem running the bot, but An error occurred when I entered a command to download YouTube. [!play url] WARNING: Unknown codec unknown So I searched for 3 hours for WARNING: Unknown codec unknown I couldn't find anything like that. I've tried to youtube-dl -U, FFMPEG update, change the (...) -- https://github.com/Just-Some-Bots/MusicBot, https://just-some-bots.github.io/MusicBot/installing/ubuntu/
• 13:50
  Playing a video with JavaCV and FFmpeg - Wamasa Newest 'ffmpeg' Questions - Stack Overflow
  So, I'm developing a custom video player for Android but I need to play more than the android supported video files (mp4, 3gp...), like wmv, avi, flv. At this time I do already convert any video type to .mp4 and I'm able to play them after recoding, but I have no idea how can I play those wmv, avi files without recoding them to mp4 video formats. Is there any way I can play any video on Android without recoding them? JavaCV + FFmpeg library already working, just don't know how to do that. By the way, heres the code that I'm using to recode videos: public static void convert(File file) (...)
• 09:38
  Text To animated mp4 video - Himanshu Tank Newest 'ffmpeg' Questions - Stack Overflow
  i need a big help, i would like to send in Text from Web which needs to get converted into an animated MP4, please help if anyone has tried this this is wgat i tried so far: ffmpeg -y -i bg-video.mp4 -filter_complex "[0]split[base][text]:[text]drawtext=fontfile=HelveticaNeue.ttf:text='Himanshu': fontcolor=white:\\ fontsize=40: box=1: boxcolor=blackⓐ0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2,format=yuva444p,fade=t=in:st=2:d=1:alpha=1,fade=t=out:st=3:d=1:alpha=1[subtitles]; \\[base][subtitles]overlay" output.mp4 is there any way to get mp4 video from html animated (...)
• 07:06
  Make an Alpha Mask video from PNG files - Archimedes Trajano Newest 'ffmpeg' Questions - Stack Overflow
  For RenPy it uses the notion of an Alpha Mask video https://www.renpy.org/doc/html/movie.html#movie-displayables-and-movie-sprites I can convert the a bunch of PNGs with alpha channel to http://wiki.webmproject.org/howtos/convert-png-frames-to-webm-video I was wondering how to do the same sort of thing without creating another set of PNG files with just the alpha frame. I'll be okay with something that uses imagemagik in the middle if needed. -- https://www.renpy.org/doc/html/movie.html#movie-displayables-and-movie-sprites, http://wiki.webmproject.org/howtos/convert-png-frames-to-webm-video
• 06:51
  How to not add AdaptationSet for audio in cmd file if audio stream is not present in input video file - Saurabh Newest 'ffmpeg' Questions - Stack Overflow
  I am using ffmpeg-dash to create mpd files. I am using following command to generate the same: ffmpeg -i input/video.mov \\ -map 0:v:0 -map 0:v:0 -map 0:v:0 -map 0:a\\?:0 \\ -b:v:0 350k -c:v:0 libx264 -filter:v:0 "scale=320:-1" \\ -b:v:1 1000k -c:v:1 libx264 -filter:v:1 "scale=640:-1" \\ -b:v:2 3000k -c:v:2 libx264 -filter:v:2 "scale=1280:-1" \\ -use_timeline 1 -use_template 1 -window_size 6 -adaptation_sets "id=0,streams=v id=1,streams=a" \\ -seg_duration 2 -threads 16 -hls_playlist true -f dash output/ffmpeg/output.mpd This works with video which has audio streams, but for the case there is (...) -- ffmpeg-dash
• 04:03
  HLS encoded video (ffmpeg) breaks in Safari when segmented via byte-range - eschie Newest 'ffmpeg' Questions - Stack Overflow
  Some of my HLS encoded videos via ffmpeg drop the audio when seeking past the buffer. The only way to sync the audio and video up again is to restart the video. What would be causing this? Example Profile: bitrate: 4800, profile: 'high', level: '4.1', resolution: 1080, framerate: '24000/1001' ffmpeg '-y' '-i' input_file.mov '-v' error '-map' '0:0' '-c:v' libx264 '-x264opts' f' keyint=23: min-keyint=23: no-scenecut ' '-vf' f'scale=-1:1080' '-preset' 'slow' '-profile:v' 'high' '-level' '4.1' '-b:v' '4800k' '-maxrate' '4800k' '-movflags' 'faststart' '-bufsize' '9600k' '-write_tmcd', '0' (...)