Failed to update header with correct duration & Failed to update header with correct filesize.

[gavin2812]

Hello all,

I'm running into an issue using a script (main part as follows):

enc = %ffmpeg(format = "flv",
       %audio(codec="libfdk_aac",
        samplerate=44100,
        channels=2,
        b="128k",
        profile="aac_he"),
       %video(codec = "libx264" , width = 1280, height = 720, b = "4000k", preset = "veryfast")
       )
output.url(fallible=true, url=url1, enc, main_source)

To simply play videos from a playlist (folder) and it will play the first video, then exit with the following:

[flv @ 0x7fe1b3c19280] Failed to update header with correct duration.
[flv @ 0x7fe1b3c19280] Failed to update header with correct filesize.

I've read up on this and it's suggested that I use the following flag
-flvflags no_duration_filesize

So I try with the following:

enc = %ffmpeg(format = "flv",
       %audio(codec="libfdk_aac",
        samplerate=44100,
        channels=2,
        b="128k",
        profile="aac_he"),
       %video(codec = "libx264" , width = 1280, height = 720, b = "4000k", preset = "veryfast", flvflags="no_duration_filesize")
       )
output.url(fallible=true, url=url1, enc, main_source)

But if I include this I get an error starting the script:

Any ideas on what may be causing the error and how to fix it?
Thanks!