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• ffmpeg does not produce smooth videos from mkv h265

  13 décembre 2018, par user3776738

  It’s kind of subjective, but I’m not able to produce 100% smooth videos with ffmpeg.
  As input I use https://www.libde265.org/hevc-bitstreams/tos-1720x720-cfg01.mkv as a example.This is a h264 mkv video which is running really badly with my vlc player on my win7 laptop.Converting it to a h264 video let it play much better, but it still appears not to be 100% smooth. Especialy in Vegas 9 it even hangs like once a second.

  Other h264 videos even with 1080p or bigger run perfect with vlc and much better with Vegas, so it is not my laptop.

  its seems that there can be a lot of differences between h264 and h264 ??
  what could i try to make them more smooth ?

  I’m using following command to convert the video :

  ffmpeg.exe -i INPUT_FILE -ac 2 -vf scale=trunc\\(oh*a/2\\)*2:480 -c:v libx264 -sn -dn -map_metadata -1 -map_chapters -1 -profile:v high -level:v 4.0 -pix_fmt yuv420p OUTPUT_FILE  

• 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 ?