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• mobile-ffmpeg can't open gallery videos

  25 juillet 2020, par MoTahir

  I'm trying to practice video editing with ffmpeg, I made a sample app which allows the users to either record a video then edit it or choose a video from gallery to edit.

  


  When the user records videos with the application a temporary file is created then that file path is sent to ffmpeg to edit then save

  


  "-i $videoPath  -vf crop=ih/$screenR:ih $outPath"


  


  I'm just cropping the video then saving it as a test, The above command works as intended without any problems.

  


  When I try to edit videos from gallery it doesn't work, I understand that the storage system in new versions of android devices is different, the uri is just an address to the content not an actual path to the file

  


  the video path from gallery is something like this

  


  


  content ://media/external/file/38625

  


  


  ffmpeg can not access the video with that path so it can't edit it, what should I do ? thank you in advance.

  


• Combine videos using Ffmpeg in Lambda and S3

  6 mars 2021, par Stan van Weringh

  Goal

  


  Im making a video converting tool with AWS Lambda where videos can be uploaded using a webpage to a S3 bucket. When all videos (1 or more) are uploaded to the bucket a done.json file will be uploaded last. A Lambda function is called on every upload and only will do something when the final done.json is uploaded.

  


  Code walkthrough

  


  Once the done.json is uploaded it will get all the videos in the current folder and convert them using Ffmpeg like this :

  


   i = 0
 ts_video_paths = []
 for video in video_paths:
     video_ts = os.path.splitext(video)[0] + '.ts'
     s3_source_signed_url = s3_client.generate_presigned_url('get_object', Params={'Bucket': S3_SOURCE_BUCKET, 'Key': video},  ExpiresIn=SIGNED_URL_TIMEOUT)
                
     ts_video_paths.append(f'/tmp/{rnd}/ts_video{i}.ts')
     ffmpeg_ts_cmd = f'/opt/bin/ffmpeg -i {s3_source_signed_url} -c:v copy -copyts -bsf:v h264_mp4toannexb -f mpegts -flags -global_header -af aresample=async=1:first_pts=0 /tmp/{rnd}/ts_video{i}.ts'
     command = shlex.split(ffmpeg_ts_cmd)
     subprocess.run(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
                
     i += 1


  


  After all the .ts files are made they will be made into one file (saw somewhere that you can just add .ts files)

  


   data = b''
 for video in ts_video_paths:
   f = open(video, 'rb')
   data += f.read()
            
   f = open(f'/tmp/{rnd}/all.ts', 'wb')
   f.write(data)
   f.close()          


  


  The last step is to convert the all.ts to a .mp4 video. In this step I sometimes can't an error. It only happens with some videos and I cant find a solution.

  


  ffmpeg_combine_cmd = f'/opt/bin/ffmpeg -i /tmp/{rnd}/all.ts -acodec copy -vcodec copy -f mp4 /tmp/{rnd}/video.mp4'
command_final = shlex.split(ffmpeg_combine_cmd)
p2 = subprocess.run(command_final , check=True)  # Sometimes gives an error videos 


  


  Error that I get with some video converting :

  


  Command '['/opt/bin/ffmpeg', '-i', '/tmp/CLZHC/all.ts', '-acodec', 'copy', '-vcodec', 'copy', '-f', 'mp4', '/tmp/CLZHC/video.mp4']' returned non-zero exit status 1.


  


  My question to you

  


  

  • Is this the "right" way to tackle this problem ?

  


  • Does someone know what the erro is im getting ?

  


  • Or can anybody give me tips ?

  


  


• Special characters in ffmpeg cmd

  28 avril 2021, par user12221095

  Good day.

  


  I am trying to write a batch file to easily record an specific window running on the background while I can work on something else. The current code is :

  


  set Clase=Estacion Servicio 1
set Audio="@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{9B5F7B86-881D-490E-BA6F-1D4DFE78C334}"
ffmpeg -rtbufsize 2G -f gdigrab -framerate 20 -i title="Title" -f dshow -i audio=%Audio% -b:v 180K -maxrate 200K -bufsize 1M -ab 96k "C:\Users\Usuario\Documents\Clases\%Clase%.mp4"
pause 


  


  The code works great for the quality required, however the title of the window I need to capture sometimes has special characters which ffmpeg isn't recognising, for example, replacing "Title" with :

  


  Reproductor de grabaciones basadas en red - Curso Modelación y cálculo de una estación de servicio (1/6)

  


  (title copied from PowerShell to avoid spelling mistakes)

  


  fails with the following error :

  


  [gdigrab @ 0000018079ce37c0] Can't find window 'Reproductor de grabaciones basadas en red - Curso Modelación y cálculo de una estación de servicio (1/6)', aborting.
title=Reproductor de grabaciones basadas en red - Curso Modelación y cálculo de una estación de servicio (1/6): I/O error


  


  I imagine all I have to do is replace the "á" and "ó" with something, but I don't know what.

  


  Thanks.