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    Modifier le thème graphique utilisé
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Sur d’autres sites (12793)

  • convert video to flv ffmpeg.exe

    6 octobre 2014, par George

    I’m trying to convert video to flv using ffmpeg. I have found an article here and did same but when i’m uploading video it’s 0kb in flv format. about mp4 everything is alright.

    I think problem is here

    string imgargs = " -i \"" + outputPath + "\\" + fileName.Remove(fileName.IndexOf(".")) + ".flv" + "\" -f image2 -ss 1 -vframes 1 -s 280x200 -an \"" + imgpath + "\\" + fileName.Remove(fileName.IndexOf(".")) + ".jpg" + "\"";
    
ConvertNow(imgargs);

    any idea how i can improve that ?

    EDIT

    if i’ll run
    ffmpeg -i C:Users\NewUser\Desktop\MOV_1013.mp4 -vcodec libx264 -preset medium -crf 23 -acodec libmp3lame -ar 44100 -q:a 5 C:Users\NewUser\Desktop\MOV_1013.flv

    in cmd it works.. but in visual studio

     string cmd = " -i " + inputPath + "\\" + fileName + " -vcodec libx264 -preset medium -crf 23 -acodec libmp3lame -ar 44100 -q:a 5 " + outputPath + "\\" + fileName.Remove(fileName.IndexOf(".")) + ".flv";
    
        ConvertNow(cmd);

    doesn’t works..

  • ffmpeg - converting webm videos generated by Chrome is slow

    2 juin 2024, par Nuthinking

    I generate webm files in two different ways. One using Chrome WebRTC MediaRecorder, the other one is using a js library which generates the webm video frame by frame (webm-writer-js). The file size of the videos generated is not that different, the fast one is 60% of the slow one but the difference in speed is 1000%

    



    Using the basic ffmpeg syntax -i input.webm output.mp4 the files created with Chrome's media recorder take in fact almost 10x time to be converted. The conversion logs differ slightly but overall look very similar to my novice eyes. On the left the fast conversion and on the right the slow one.

    



    enter image description here

    



    The fast one throws a little error but the conversion seems successful. In the slow conversion you can see many frames processed, in the fast one as if there was only one (very fast). Using -preset veryfast cuts the speed time by half to both but the loss of quality is visible.

    



    Any idea how I could speed up the conversion for the videos generated by Chrome without compromising much in quality ? Thanks a lot !

    


  • ffmpeg falls every 15 seconds

    23 avril 2020, par TiHan

    I have a problem with ffmpeg on virtual machine !

    



    here is my command

    



    ffmpeg -i rtsp://1.2.3.4/some_channel.sdp -f segment -strftime 1 -segment_time 60 ./%s.wav


    



    i have ffmpeg version 3.4.6

    



    everything work alright on simple PC. No stops. It works great !

    



    but on VM it falls every 15 seconds and the last message in the Terminal is

    



    


    size=N/A time=00:0014:97 bitrate=N/A speed = 1x
 video:0kB audio:468kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : unknown

    


    



    size=N/A time=00:00:14.54 bitrate=N/A speed= 1x
[mp2 @ 0x5597df2fb940] overread, skip -7 enddists: -6 -6
[mp2 @ 0x5597df2fb940] overread, skip -6 enddists: -4 -4
Last message repeated 1 times
[mp2 @ 0x5597df2fb940] overread, skip -5 enddists: -2 -2
size=N/A time=00:00:15.01 bitrate=N/A speed= 1x
size=N/A time=00:00:15.01 bitrate=N/A speed= 1x
video:0kB audio:469kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown


    


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