3 mai

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

• 15:07
  encoding XDCAM MXF with FFMPEG [closed] - Mark Yang Newest 'ffmpeg' Questions - Stack Overflow
  Trying to encode XDCAM HD422 MXF with FFMPEG But can't know specific setting for encoder/format/mux Anyone can show me sample code or give some advice for that ?
• 14:12
  FFmpeg does not detect bitstream filter parameter - FFmpegEnthusiast Newest 'ffmpeg' Questions - Stack Overflow
  I have tried to make a bitstream filter for FFmpeg that drops the nth keyframe for positive numbers and allows the first n keyframes and drops the rest for nonpositive numbers, called "datamosh": ffmpeg -i input.webm -bsf:v datamosh=target=20 -c copy output.webm outputs the error: Option 'target' not found [vost#0:0/copy ⓐ 0x54edc40] Error parsing bitstream filter sequence 'datamosh=target=20': Option not found Here is the code for the "datamosh" bitstream filter: #include "bsf.h" #include "bsf_internal.h" #include (...)
• 09:04
  HEVC with alpha - foxhable Newest 'ffmpeg' Questions - Stack Overflow
  I trying create HEVC with alpha video from png images through ffmpeg. When i try, it outputs a video that works, has a transparent background and opens in QuickTime, but does not open in Safari. Then i try creating in prores 4444 codec and convert from macOS Context Menu -> Encode Selected Video Files with HEVC 1080p and Preserve Transparency. It has work - video with transparent background, open in QuickTime and in Safari. So i tried understand what a difference in meta data and only what i find its working video has HVEC encoder, but not working has Lavc61.5.103 (...) -- example of working video
• 09:43
  Muxing together a .ts file and a sub file causes playback issues in video and audio - Meta83 Newest 'ffmpeg' Questions - Stack Overflow
  So I have a .ts file and a converted .dvb sub file (.SRT TO .DVB) that I want to mux togheter using FFMPEG. The mux is a success and the file plays fine in VLC or other modern divce.However I have an older divce (around 10 yeras old) where playback has issues, whenever a line of subs is displayd the picture and and audio gets corrupted and frezzes up and as sson there are no lins everything looks good again and so on. Note that subs are displayd correctly and they are not affected by the issue, only picture and audio is. I have tried using diffrent command without any luck but here (...)
• 07:45
  Specify percentage instead of time to ffmpeg - user779159 Newest 'ffmpeg' Questions - Stack Overflow
  To get a thumbnail from an image halfway through the video I can do ffmpeg -ss 100 -i /tmp/video.mp4 -frames:v 1 -s 200x100 image.jpg. By using -ss 100 it gets a thumbnail at 100 seconds (which would be halfway through the video assuming the video is 200 seconds long). But if I don't know the exact length of the video, in my application code I would need to use something like ffprobe to first determine the length of the video, and then divide it by 2 to get the thumbnail time. Is there a way to get ffmpeg to get the thumbnail at the percentage of the video you (...)
• 04:27
  Error transcoding with FFmpeg: Error: Output format hls is not available - asif mohmd Newest 'ffmpeg' Questions - Stack Overflow
  I am using FFmpeg library to transcode a video file into multiple resolutions and create an HLS (HTTP Live Streaming) master playlist. It takes a video file as input but its does give me the output with HLS playlist.I got a error called "Output format hls is not available". Only the Output directory is creating I am using FFMpeg 7.0 full build version and also tried older versions and ffmpeg essentials and also tried chocolatey. if i remove the implementation of HLS from this code.it will create 4 different resolution videos in my output. Note:I just tried this same (...)

2 mai

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

• 21:18
  How to create chunks of videos (.ts) and .m3u8 file from a mp4 video? - Nafisur Ahmed Newest 'ffmpeg' Questions - Stack Overflow
  I need to create chunks of videos (.ts) of fixed duration (say 5 or 10 seconds) from a mp4 video. And also I need the chunks in different formats (260p, 480p, 720p, 1080p). I'm able to create the chunks and m3u8 using the command below: ffmpeg -i input.mp4 -g 60 -hls_time 10 out.m3u8 but not able to create for different resolutions as mentioned above.
• 21:03
  Output image twice in ffplay - Sun Tzun Newest 'ffmpeg' Questions - Stack Overflow
  I need to show two similar images from a webcam side-by-side. I can achieve this with this piped command, but it runs with a few seconds latency: ffmpeg -f dshow -i video="Logi C310 HD WebCam" -filter_complex "[0:v][0:v]hstack=inputs=2[v]" -map "[v]" -f matroska - | ffplay - I'd prefer to do the same in just ffplay. I'd also like to have the resulting image cropped to a square size or to the size of the original image (like if the picture from webcam gets divided by half and the halfs took each other places). What I need in this end is a tool that (...)
• 20:01
  Codec AVOption b (set bitrate (in bits/s)) specified for output file #0 (360p.m3u 8) has not been used for any stream. - Marc Archenault Newest 'ffmpeg' Questions - Stack Overflow
  I am receiving this warning from ffmpeg. The job runs and all the videos seem to output correctly. I have 2 hls, 1 mp4 with overlay + A single thumbnail. The warning: Stream #1:0: Video: png, rgba(pc), 500x38, 25 tbr, 25 tbn, 25 tbc Codec AVOption b (set bitrate (in bits/s)) specified for output file #0 (360p.m3u 8) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of s ome encoder which was not actually used for any stream. The windows (...)
• 18:52
  convert video to audio - ffmpeg - shakti goyal Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to convert video to audio using ffmpeg in flutter based application but command is not working. Is there something wrong with the command? void convert(File pickedVideo) async Directory applicationDocDirectory = await getApplicationDocumentsDirectory(); final outputPath = '$applicationDocDirectory.path/output-audio-$const Uuid().v1().mp3'; final session = await FFmpegKit.execute('-i $pickedVideo.path -vn -acodec mp3 $outputPath'); final returnCode = await session.getReturnCode();  (...)