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Apr 18, 2013 5:35 pm
The great thing about getting the info in JSON format is that it is easily readable without having to resort to looking for any documentation.
If you uncomment the line
format "%
" l
You will get some output like this below. Without trying too hard, you can see that it contains two streams, one video, one audio. All the other data you would need is listed, so you can decide how to parse it based on the examples provided already.
{
"streams": [
{
"index": 0,
"codec_name": "h264",
"codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
"profile": "Main",
"codec_type": "video",
"codec_time_base": "1/50",
"codec_tag_string": "avc1",
"codec_tag": "0x31637661",
"width": 1280,
"height": 720,
"has_b_frames": 1,
"sample_aspect_ratio": "0:1",
"display_aspect_ratio": "0:1",
"pix_fmt": "yuv420p",
"level": 51,
"r_frame_rate": "25/1",
"avg_frame_rate": "25/1",
"time_base": "1/25",
"start_pts": 0,
"start_time": "0.000000",
"duration_ts": 31453,
"duration": "1258.120000",
"bit_rate": "441269",
"nb_frames": "31453",
"disposition": {
"default": 0,
"dub": 0,
"original": 0,
"comment": 0,
"lyrics": 0,
"karaoke": 0,
"forced": 0,
"hearing_impaired": 0,
"visual_impaired": 0,
"clean_effects": 0,
"attached_pic": 0
},
"tags": {
"creation_time": "2012-03-24 09:25:52",
"language": "eng",
"handler_name": "Apple Video Media Handler"
}
},
{
"index": 1,
"codec_name": "aac",
"codec_long_name": "AAC (Advanced Audio Coding)",
"codec_type": "audio",
"codec_time_base": "1/44100",
"codec_tag_string": "mp4a",
"codec_tag": "0x6134706d",
"sample_fmt": "fltp",
"sample_rate": "44100",
"channels": 2,
"bits_per_sample": 0,
"r_frame_rate": "0/0",
"avg_frame_rate": "0/0",
"time_base": "1/44100",
"start_pts": 0,
"start_time": "0.000000",
"duration_ts": 55483392,
"duration": "1258.126803",
"bit_rate": "127999",
"nb_frames": "54183",
"disposition": {
"default": 0,
"dub": 0,
"original": 0,
"comment": 0,
"lyrics": 0,
"karaoke": 0,
"forced": 0,
"hearing_impaired": 0,
"visual_impaired": 0,
"clean_effects": 0,
"attached_pic": 0
},
"tags": {
"creation_time": "2012-03-24 09:25:52",
"language": "eng",
"handler_name": "Apple Sound Media Handler"
}
}
],
"format": {
"filename": "C:\ emp\\TestFile.mp4",
"nb_streams": 2,
"format_name": "mov,mp4,m4a,3gp,3g2,mj2",
"format_long_name": "QuickTime / MOV",
"start_time": "0.000000",
"duration": "1258.120000",
"size": "90237437",
"bit_rate": "573792",
"tags": {
"major_brand": "mp42",
"minor_version": "1",
"compatible_brands": "mp42mp41",
"creation_time": "2012-03-24 09:25:52"
}
}
}
Apr 18, 2013 5:35 pm
Can’t seem to get frame rate to work:
struct vidOps (width,height,filename,duration,frame_rate,frames,sizeMB)
vidInfo = VidOps()
ffProbePath = "C:\ffprobe.exe"
theFile = "C:\Documents and Settings\Owner\Desktop\video-example.mp4"
if doesfileexist theFile then
(
args = " -v quiet -print_format json -show_format -show_streams " +"\"" + theFile +"\""
proc = dotnetobject "system.diagnostics.process"
proc.StartInfo.FileName = ffProbePath
proc.StartInfo.Arguments = args
proc.StartInfo.RedirectStandardOutput = true
-- needs UseShellExecute set to false in order to redirect IO streams
proc.StartInfo.UseShellExecute = false
proc.StartInfo.CreateNoWindow = true
proc.Start()
reader = proc.StandardOutput
while (l = reader.readline()) != undefined do
(
parseOutLine = trimright (trimleft l "\" ") "\""
case of
(
(matchpattern parseOutLine pattern:"*filename*"):(vidInfo.filename=(filterstring parseOutLine " ,\"")[3])
(matchpattern parseOutLine pattern:"*width*"):(vidInfo.width=((filterstring parseOutLine " ,")[2]) as integer)
(matchpattern parseOutLine pattern:"*height*"):(vidInfo.height=(filterstring parseOutLine " ,")[2] as integer)
(matchpattern parseOutLine pattern:"*duration\":*"):(vidInfo.duration=((filterstring parseOutLine " ,\"")[3] as float/60))
-- "width": 1280,
-- "duration": "1239.195267",
-- "r_frame_rate": "35029/1461",
(matchpattern parseOutLine pattern:"*r_frame_rate\":*"):(vidInfo.frame_rate=((filterstring parseOutLine " ,\"")[3] as float))
-- (matchpattern parseOutLine pattern:"*r_frame_rate*"):(vidInfo.frame_rate=((filterstring parseOutLine " ,")[2]) as float)
(matchpattern parseOutLine pattern:"*frames\":*"):(vidInfo.frames=((filterstring parseOutLine " ,\"")[3] as integer))
(matchpattern parseOutLine pattern:"*size\":*"):(vidInfo.sizeMB=((filterstring parseOutLine " ,\"")[3] as float/1024./1024.))
)
)
proc.Close()
vidInfo
)
Apr 18, 2013 5:35 pm
its because frame rate isnt stored as a float. Its a fraction. So you grab the string and execute it. you’ll have to make sure you don’t grab the audio frame rate as its stored under the same parameter name. The example I give here work on my file but im not sure how robust it is.
struct vidOps (width,height,filename,duration,frame_rate,frames,sizeMB)
vidInfo = VidOps()
ffProbePath = "C:\ffprobe.exe"
theFile = "C:\Documents and Settings\Owner\Desktop\video-example.mp4"
if doesfileexist theFile then
(
args = " -v quiet -print_format json -show_format -show_streams " +"\"" + theFile +"\""
proc = dotnetobject "system.diagnostics.process"
proc.StartInfo.FileName = ffProbePath
proc.StartInfo.Arguments = args
proc.StartInfo.RedirectStandardOutput = true
-- needs UseShellExecute set to false in order to redirect IO streams
proc.StartInfo.UseShellExecute = false
proc.StartInfo.CreateNoWindow = true
proc.Start()
reader = proc.StandardOutput
while (l = reader.readline()) != undefined do
(
parseOutLine = trimright (trimleft l "\" ") "\""
case of
(
(matchpattern parseOutLine pattern:"*filename*"):(vidInfo.filename=(filterstring parseOutLine " ,\"")[3])
(matchpattern parseOutLine pattern:"*width*"):(vidInfo.width=((filterstring parseOutLine " ,")[2]) as integer)
(matchpattern parseOutLine pattern:"*height*"):(vidInfo.height=(filterstring parseOutLine " ,")[2] as integer)
(matchpattern parseOutLine pattern:"*duration\":*"):(vidInfo.duration=((filterstring parseOutLine " ,\"")[3] as float/60))
(matchpattern parseOutLine pattern:"*r_frame_rate\":*"):
(
local rate = (filterstring parseOutLine " ,\"")[3]
if rate != "0/0" then vidInfo.frame_rate = (execute rate)
)
(matchpattern parseOutLine pattern:"*frames\":*"):(vidInfo.frames=((filterstring parseOutLine " ,\"")[3] as integer))
(matchpattern parseOutLine pattern:"*size\":*"):(vidInfo.sizeMB=((filterstring parseOutLine " ,\"")[3] as float/1024./1024.))
)
)
proc.Close()
vidInfo
)
Apr 18, 2013 5:35 pm
Hi Artur, I hope you are well. Thanks! Symlinks are useful!
Apr 18, 2013 5:35 pm
Everything works now. Thanks for help
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