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• Unable to write textclip with moviepy due to errors with Imagemagick

  5 février, par Sato

  I am trying to write TextClip into a video with moviepy. It has always been working, yet after I reinstalled ffmpeg, it doesn't work anymore (I am not sure whether it has caused it, but I mentioned it in case it does). Some of the TextClip objects are pure spaces.

  


  I got the following error message :

  


  Traceback (most recent call last):&#xA;  File "C:\Users\USER\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\LocalCache\local-packages\Python38\site-packages\moviepy\video\VideoClip.py", line 1137, in __init__&#xA;    subprocess_call(cmd, logger=None)&#xA;  File "C:\Users\USER\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\LocalCache\local-packages\Python38\site-packages\moviepy\tools.py", line 54, in subprocess_call&#xA;    raise IOError(err.decode(&#x27;utf8&#x27;))&#xA;OSError: magick.exe: no images for write &#x27;-write&#x27; &#x27;PNG32:C:\Users\USER\AppData\Local\Temp\tmpmnf0fkb5.png&#x27; at CLI arg 14 @ error/operation.c/CLINoImageOperator/4893.&#xA;&#xA;&#xA;During handling of the above exception, another exception occurred:&#xA;&#xA;Traceback (most recent call last):&#xA;  File "media_main_user.py", line 79, in <module>&#xA;    insert_audio_and_subtitles(input_clip,&#x27;output.mp4&#x27;,&#x27;text.mp3&#x27;,subtitles,fontsize=subtitles_font_size,&#xA;  File "D:\UserData\Desktop\Project\影片剪輯\關鍵字版本\make_media.py", line 318, in insert_audio_and_subtitles&#xA;    annotated_clips = [annotate(video.subclip(from_t, to_t), txt) for (from_t, to_t), txt in subtitles]&#xA;  File "D:\UserData\Desktop\Project\影片剪輯\關鍵字版本\make_media.py", line 318, in <listcomp>&#xA;    annotated_clips = [annotate(video.subclip(from_t, to_t), txt) for (from_t, to_t), txt in subtitles]&#xA;  File "D:\UserData\Desktop\Project\影片剪輯\關鍵字版本\make_media.py", line 311, in annotate&#xA;    txtclip = TextClip(txt, fontsize=fontsize, font=font, color=txt_color)&#xA;  File "C:\Users\USER\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\LocalCache\local-packages\Python38\site-packages\moviepy\video\VideoClip.py", line 1146, in __init__&#xA;    raise IOError(error)&#xA;OSError: MoviePy Error: creation of None failed because of the following error:&#xA;&#xA;magick.exe: no images for write &#x27;-write&#x27; &#x27;PNG32:C:\Users\USER\AppData\Local\Temp\tmpmnf0fkb5.png&#x27; at CLI arg 14 @ error/operation.c/CLINoImageOperator/4893.&#xA;.&#xA;&#xA;.This error can be due to the fact that ImageMagick is not installed on your computer, or (for Windows users) that you didn&#x27;t specify the path to the ImageMagick binary in file conf.py, or that the path you specified is incorrect&#xA;</listcomp></module>

  


  I have tried to solve the problems multiple ways, like checking the config-default.py file in moviepy installation directory, and the path for ImageMagick it's pointing to is not wrong. I tried to reinstall ImageMagick, it is also of no use. And I tried to edit the policy.xml file in ImageMagick directory from none to read|write, but it also doesn't work. Can anyone suggest other possible solutions ?

  


• FFMPEG Command in Android Failing to Execute

  15 janvier 2015, par Zoe

  I’m trying to execute ffmpeg commands through an android app I’m developing.

  I found this post which has been somewhat useful :
  Problems with ffmpeg command line on android

  and I downloaded a static build of ffmpeg from here : http://ffmpeg.gusari.org/static/

  The problem is, when this code runs

  public void merge_video(){
  
  
  
  
  
        String[] ffmpegCommand = new String[5];
  
        ffmpegCommand[0] = "/data/data/com.example.zovideo/ffmpeg";
  
        ffmpegCommand[1] = "-i";
  
        ffmpegCommand[2] = "concat:storage/emulated/0/DCIM/Camera/VID30141106_211509.mp4|storage/emulated/0/DCIM/Camera/VID30141106_211509.mp4";
  
        ffmpegCommand[3] = "copy";
  
        ffmpegCommand[4] = "storage/emulated/0/DCIM/ZoVideo/Output.mp4";  
  
  
  
        try {
  
            Process ffmpegProcess = new ProcessBuilder(ffmpegCommand).redirectErrorStream(true).start();
  
  
  
            String line;
  
            BufferedReader reader = new BufferedReader(new InputStreamReader(ffmpegProcess.getInputStream()));
  
            Log.d(null, "*******Starting FFMPEG");
  
  
  
            while((line = reader.readLine())!=null){
  
  
  
                Log.d(null, "***"+line+"***"); 
  
            }
  
            Log.d(null,"****ending FFMPEG****");
  
  
  
      } catch (IOException e) {
  
          e.printStackTrace();
  
      }
  
    }

  It fails when trying to start the process with

  Java.io.IOException: Error running exec(). Command: [/data/data/com.example.zovideo/ffmpeg, -i, concat:storage/emulated/0/DCIM/Camera/VID30141106_211509.mp4|storage/emulated/0/DCIM/Camera/VID30141106_211509.mp4, copy, storage/emulated/0/DCIM/ZoVideo/Output.mp4] Working Directory: null Environment: [ANDROID_ROOT=/system, EMULATED_STORAGE_SOURCE=/mnt/shell/emulated, LOOP_MOUNTPOINT=/mnt/obb, LD_PRELOAD=libsigchain.so, ANDROID_BOOTLOGO=1, EMULATED_STORAGE_TARGET=/storage/emulated, EXTERNAL_STORAGE=/storage/emulated/legacy, SYSTEMSERVERCLASSPATH=/system/framework/services.jar:/system/framework/ethernet-service.jar:/system/framework/wifi-service.jar, ANDROID_SOCKET_zygote=10, PATH=/sbin:/vendor/bin:/system/sbin:/system/bin:/system/xbin, ANDROID_DATA=/data, ANDROID_ASSETS=/system/app, ASEC_MOUNTPOINT=/mnt/asec, BOOTCLASSPATH=/system/framework/core-libart.jar:/system/framework/conscrypt.jar:/system/framework/okhttp.jar:/system/framework/core-junit.jar:/system/framework/bouncycastle.jar:/system/framework/ext.jar:/system/framework/framework.jar:/system/framework/telephony-common.jar:/system/framework/voip-common.jar:/system/framework/ims-common.jar:/system/framework/mms-common.jar:/system/framework/android.policy.jar:/system/framework/apache-xml.jar, ANDROID_PROPERTY_WORKSPACE=9,0, ANDROID_STORAGE=/storage]

  I understand from the stackoverflow post I mentioned above that the ffmpeg static build needs to be on my device otherwise my app cannot use it.

  However I’m unsure how to get it in the /data/data/com.example.zovideo folder as needed.

  I have done is download the latest static ffmpeg build from http://ffmpeg.gusari.org/static/ and copied it into my libs/armeabi and libs/armeabi-v7a folders but this obviously hasn’t succeeded in getting into the data/data folder when my app is installed onto my device.
  (I feel like I’m being an idiot by copy/pasting the files but I don’t know what else to do. I don’t know how to compile it myself - I have compiled ffmpeg using a Roman10 tutorial but this produces .so files which from which I understand is not what I need)

  So I’m a little stuck.
  Any advice is greatly appreciated. Thanks

• FFMPEG : RTSP to HLS restream stops with "No more output streams to write to, finishing."

  1er juin 2022, par Tim W

  I'm trying to do a live restream an RTSP feed from a webcam using ffmpeg, but the stream repeatedly stops with the error :

  



  "No more output streams to write to, finishing."

  



  The problem seems to get worse at higher bitrates (256kbps is mostly reliable) and is pretty random in its occurrence. At 1mbps, sometimes the stream will run for several hours without any trouble, on other occasions the stream will fail every few minutes. I've got a cron job running which restarts the stream automatically when it fails, but I would prefer to avoid the continued interruptions.

  



  I have seen this problem reported in a handful of other forums, so this is not a unique problem, but not one of those reports had a solution attached to it. My ffmpeg command looks like this :

  



  ffmpeg -loglevel verbose -r 25 -rtsp_transport tcp -i rtsp ://user:password@camera.url/live/ch0 -reset_timestamps 1 -movflags frag_keyframe+empty_moov -bufsize 7168k -stimeout 60000 -hls_flags temp_file -hls_time 5 -hls_wrap 180 -acodec copy -vcodec copy streaming.m3u8 > encode.log 2>&1

  



  What gets me is that the error makes no sense, this is a live stream so output is always wanted until I shut off the stream. So having it shut down because output isn't wanted is downright odd. If ffmpeg was complaining because of a problem with input it would make more sense.

  



  I'm running version 3.3.4, which I believe is the latest.

  



  Update 13 Oct 17 :

  



  After extensive testing I've established that "No more outputs" error message generated by FFMPEG is very misleading. The error seems to be generated if the data coming in from RTSP is delayed, eg by other activity on the router the camera is connected via. I've got a large buffer and timeout set which should be sufficient for 60 seconds, but I can still deliberately trigger this error with far shorter interruptions, so clearly the buffer and timeout aren't having the desired effect. This might be fixed by setting a QOS policy on the router and by checking that the TCP packets from the camera have a suitably high priority set, it's possible this isn't the case.

  



  However, I would still like to improve the robustness of the input stream if it is briefly interrupted. Is there any way to persuade FFMPEG to tolerate this or to actually make use of the buffer it seems to be ignoring ? Can FFMPEG be persuaded to simply stop writing output and wait for input to become available rather than bailing out ? Or could I get FFMPEG to duplicate the last complete frame until it's able to get more data ? I can live with the stream stuttering a bit, but I've got to significantly reduce the current behaviour where the stream drops at the slightest hint of a problem.

  



  Further update 13 Oct 2017 :

  



  After more tests, I've found that the problem actually seems to be that HLS is incapable of coping with a discontinuity in the incoming video stream. If I deliberately cut the network connection between the camera and FFMPEG, FFMPEG will wait for the connection to be re-established for quite a long time. If the interruption was long (>10 seconds) the stream will immediately drop with the "No More Outputs" error the instant that the connection is re-established. If the interruption is short, then RTSP will actually start pulling data from the camera again, but the stream will then drop with the same error a few seconds later. So it seems clear that the gap in the input data is causing the HLS encoder to have a fit and give up once the stream is resumed, but the size of the gap has an impact on whether the drop is instant or not.