<p>Fixed by updating FFMpeg to newer version</p>

CC BY-SA 3.0
2012-05-16T13:03:45.723Z
2012-05-16T13:03:45.723Z
Artog
<p>My company transcodes videos sent in by users (recorder by our own screenrecording software)</p>

<p>I use FFMpeg to do the work using this command:</p>

<pre><code> /ffmpeg/ffmpeg -i in.mov -vcodec libx264 -fpre /ffmpeg/ffpresets/libx264-slower.ffpreset   -y out.flv
</code></pre>

<p>The purpose is to prepare the video for viewing in browser.</p>

<p><strong>The problem is that the first 10, or so, seconds the quality is really poor.</strong></p>

<h2>What can cause this? and how can i fix it?</h2>

<p>Preset settings:</p>

<pre><code>coder=1
flags=+loop
cmp=+chroma
partitions=+parti8x8+parti4x4+partp8x8+partb8x8
me_method=umh
subq=8
me_range=16
g=250
keyint_min=25
sc_threshold=40
i_qfactor=0.71
b_strategy=2
qcomp=0.6
qmin=0
qmax=69
qdiff=4
bf=3
refs=5
directpred=3
trellis=1
flags2=+bpyramid+mixed_refs+wpred+dct8x8+fastpskip
wpredp=2
rc_lookahead=50
</code></pre>

<p>Exampel of an input video</p>

<pre><code>Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '84f42bcb67ac616635ef6f99057bbbc46d418295.mov':
Metadata:
    major_brand     : qt
    minor_version   : 537199360
    compatible_brands: qt
    creation_time   : 2012-03-07 13:45:16
  Duration: 00:15:56.00, start: 0.000000, bitrate: 4108 kb/s
    Stream #0.0(eng): Video: qtrle, rgb24, 1680x945, 3401 kb/s, 13.61 fps, 1k tbr, 1k tbn, 1k tbc
    Metadata:
      creation_time   : 2012-03-07 13:45:16
    Stream #0.1(eng): Audio: pcm_s16be, 44100 Hz, 1 channels, s16, 705 kb/s
    Metadata:
      creation_time   : 2012-03-07 13:45:16
</code></pre>

CC BY-SA 3.0
2012-03-28T18:09:13.337Z
Any chance you could post an example, both of input and of the poor-quality output? Would help trying to tweak it (and reproduce the problem).
derobert
<codec><ffmpeg><video-quality><quality><transcoding>
How do I prevent Quality loss in the beginning of a video?
Artog
# How do I prevent Quality loss in the beginning of a video?

(Asked by: username_0 on 2012-03-23)

My company transcodes videos sent in by users (recorder by our own screenrecording software)
I use FFMpeg to do the work using this command:
 /ffmpeg/ffmpeg -i in.mov -vcodec libx264 -fpre /ffmpeg/ffpresets/libx264-slower.ffpreset   -y out.flv

The purpose is to prepare the video for viewing in browser.
The problem is that the first 10, or so, seconds the quality is really poor.
What can cause this? and how can i fix it?
Preset settings:
coder=1
flags=+loop
cmp=+chroma
partitions=+parti8x8+parti4x4+partp8x8+partb8x8
me_method=umh
subq=8
me_range=16
g=250
keyint_min=25
sc_threshold=40
i_qfactor=0.71
b_strategy=2
qcomp=0.6
qmin=0
qmax=69
qdiff=4
bf=3
refs=5
directpred=3
trellis=1
flags2=+bpyramid+mixed_refs+wpred+dct8x8+fastpskip
wpredp=2
rc_lookahead=50

Exampel of an input video
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '84f42bcb67ac616635ef6f99057bbbc46d418295.mov':
Metadata:
    major_brand     : qt
    minor_version   : 537199360
    compatible_brands: qt
    creation_time   : 2012-03-07 13:45:16
  Duration: 00:15:56.00, start: 0.000000, bitrate: 4108 kb/s
    Stream #0.0(eng): Video: qtrle, rgb24, 1680x945, 3401 kb/s, 13.61 fps, 1k tbr, 1k tbn, 1k tbc
    Metadata:
      creation_time   : 2012-03-07 13:45:16
    Stream #0.1(eng): Audio: pcm_s16be, 44100 Hz, 1 channels, s16, 705 kb/s
    Metadata:
      creation_time   : 2012-03-07 13:45:16

**Tags:** codec, ffmpeg, video-quality, quality, transcoding

> **Comments:**
> **username_1**: Any chance you could post an example, both of input and of the poor-quality output? Would help trying to tweak it (and reproduce the problem).  

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## 1 answers

### Answer by username_0 on 2012-05-16. Score: 2 | Accepted answer

Fixed by updating FFMpeg to newer version


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