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    Utilité
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Sur d’autres sites (6862)

  • Is it possible to encode one yuv file to 3 h.264 files with different bitrates with one command ?

    24 juillet 2012, par Richard Knop

    I have a YUV file. I need to encode it to H.264 but using three different bitrates. Is it possible to do it with one command so the yuv file does not need to be processed muttiple times ?

    Here's what I do right now :

    x264 -B 600 -o /path/to/output_first.264 /path/to/input.yuv
    
x264 -B 800 -o /path/to/output_second.264 /path/to/input.yuv
    
x264 -B 1000 -o /path/to/output_second.264 /path/to/input.yuv

    Is it possible to do it in one command to make it faster ? YUV file can be quite big so I don't want to extract it three times in a row. And all three encoding processes use the same input YUV file so I guess it should be possible.

  • ffmpeg bit rate

    13 juillet 2012, par user1522872

    I am transcoding a video using FFMPEG API in c code.
    I am trying to set the video bit rate using the ffmpeg API as shown below :

    ovCodecCtx->bit_rate = 100 * 1000;

    The Encoder I am using is libx264.

    But this parameter is not taken into effect and the resulting video quality is very bad.
    I have even tried setting related parameters like rc_min_rate, rc_max_rate, etc.. but the video quality is still very low as these related parameters are not taken into effect.

    Could any expert tell how one can set the bit rate correctly using the FFMPEG API ?
    Thanks

  • Program hangs while using ffprobe on file with teletext subtitles

    6 août 2012, par Jon

    Having a problem running ffprobe on an MKV file that contains teletext subtitles. Code is in a C# library and works fine for other MKV files.

    Running the latest :

    ffprobe -v
    

    
ffprobe version N-42347-g299387e Copyright (c) 2007-2012 the FFmpeg developers
    
  built on Jul  8 2012 15:44:54 with gcc 4.7.1

    Code :

    string args = string.Format("-show_format -show_streams \"{0}\"", FileName);
    

    
Process p = new Process();
    
p.StartInfo = new ProcessStartInfo(FFPROBE_PATH);
    
p.StartInfo.Arguments = args;
    
p.StartInfo.CreateNoWindow = true;
    
p.StartInfo.RedirectStandardOutput = true;
    
p.StartInfo.RedirectStandardError = true;
    
p.StartInfo.UseShellExecute = false;
    
p.StartInfo.WorkingDirectory = System.IO.Directory.GetCurrentDirectory();
    
p.Start();
    

    
while (!p.HasExited)
    
{
    
    System.Threading.Thread.Sleep(100);
    
}
    

    
string output = p.StandardOutput.ReadToEnd().Replace("\r\n", "\n");

    The filename has a UNC path - tried using the FileName parameter but got an error, hence passing the filename via the arguments.

    If I run the following commandline :

    ffprobe -show_format -show_streams "\192.168.10.1\content\Breakfast At Tiffany's sample preview.mkv"

    I get the following output (note the errors - "Unsupported codec with id ...") :

    ffprobe -show_format -show_streams "\\192.168.10.1\content\Breakfast At Tiffany's sample preview.mkv"
    

    
ffprobe version N-42347-g299387e Copyright (c) 2007-2012 the FFmpeg developers
    
  built on Jul  8 2012 15:44:54 with gcc 4.7.1
    
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-fr
    
ei0r --enable-libass --enable-libcelt --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-li
    
bmp3lame --enable-libnut --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libutv
    
ideo --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --e
    
nable-zlib
    
  libavutil      51. 64.100 / 51. 64.100
    
  libavcodec     54. 33.100 / 54. 33.100
    
  libavformat    54. 15.102 / 54. 15.102
    
  libavdevice    54.  1.100 / 54.  1.100
    
  libavfilter     3.  1.100 /  3.  1.100
    
  libswscale      2.  1.100 /  2.  1.100
    
  libswresample   0. 15.100 /  0. 15.100
    
  libpostproc    52.  0.100 / 52.  0.100
    
Input #0, matroska,webm, from 'c:\dev\content\Breakfast At Tiffany's sample preview.mkv':
    
  Metadata:
    
    creation_time   : 2011-12-14 21:27:01
    
  Duration: 00:01:02.77, start: 0.000000, bitrate: 4071 kb/s
    
    Stream #0:0: Video: h264 (High), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
    
    Metadata:
    
      title           : x264   1920x1080   Bitrate=4776 kbps   AvQuant=21.406   Rip by ShivaShanti
    
    Stream #0:1(eng): Audio: ac3, 48000 Hz, 5.1(side), s16, 448 kb/s (default)
    
    Metadata:
    
      title           : English Ac3 5.1 chnls 448 kbps
    
    Stream #0:2(ita): Audio: ac3, 48000 Hz, stereo, s16, 224 kb/s
    
    Metadata:
    
      title           : Italian Ac3 2.0 chnls 224  kbps
    
    Stream #0:3(eng): Subtitle: text (default)
    
    Metadata:
    
      title           : english
    
    Stream #0:4(ita): Subtitle: text
    
    Metadata:
    
      title           : italian
    
    Stream #0:5(dan): Subtitle: text
    
    Metadata:
    
      title           : danish
    
    Stream #0:6(dut): Subtitle: text
    
    Metadata:
    
      title           : dutch
    
    Stream #0:7(fin): Subtitle: text
    
    Metadata:
    
      title           : finnish
    
    Stream #0:8(fre): Subtitle: text
    
    Metadata:
    
      title           : french
    
    Stream #0:9(ger): Subtitle: text
    
    Metadata:
    
      title           : german
    
    Stream #0:10(nor): Subtitle: text
    
    Metadata:
    
      title           : norwegian
    
    Stream #0:11(spa): Subtitle: text
    
    Metadata:
    
      title           : spanish
    
    Stream #0:12(swe): Subtitle: text
    
    Metadata:
    
      title           : swedish
    
    Stream #0:13(eng): Subtitle: text
    
    Metadata:
    
      title           : english hearig impaired
    
Unsupported codec with id 94210 for input stream 3
    
Unsupported codec with id 94210 for input stream 4
    
Unsupported codec with id 94210 for input stream 5
    
Unsupported codec with id 94210 for input stream 6
    
Unsupported codec with id 94210 for input stream 7
    
Unsupported codec with id 94210 for input stream 8
    
Unsupported codec with id 94210 for input stream 9
    
Unsupported codec with id 94210 for input stream 10
    
Unsupported codec with id 94210 for input stream 11
    
Unsupported codec with id 94210 for input stream 12
    
Unsupported codec with id 94210 for input stream 13
    
[STREAM]
    
index=0
    
codec_name=h264
    
codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
    
profile=High
    
codec_type=video
    
codec_time_base=1001/48000
    
codec_tag_string=[0][0][0][0]
    
codec_tag=0x0000
    
width=1920
    
height=1080
    
has_b_frames=2
    
sample_aspect_ratio=1:1
    
display_aspect_ratio=16:9
    
pix_fmt=yuv420p
    
level=41
    
timecode=N/A
    
is_avc=1
    
nal_length_size=4
    
id=N/A
    
r_frame_rate=24000/1001
    
avg_frame_rate=24000/1001
    
time_base=1/1000
    
start_time=0.000000
    
duration=N/A
    
bit_rate=N/A
    
nb_frames=N/A
    
nb_read_frames=N/A
    
nb_read_packets=N/A
    
TAG:title=x264   1920x1080   Bitrate=4776 kbps   AvQuant=21.406   Rip by ShivaShanti
    
[/STREAM]
    
[STREAM]
    
index=1
    
codec_name=ac3
    
codec_long_name=ATSC A/52A (AC-3)
    
profile=unknown
    
codec_type=audio
    
codec_time_base=1/48000
    
codec_tag_string=[0][0][0][0]
    
codec_tag=0x0000
    
sample_fmt=s16
    
sample_rate=48000
    
channels=6
    
bits_per_sample=0
    
dmix_mode=-1
    
ltrt_cmixlev=-1.000000
    
ltrt_surmixlev=-1.000000
    
loro_cmixlev=-1.000000
    
loro_surmixlev=-1.000000
    
id=N/A
    
r_frame_rate=0/0
    
avg_frame_rate=0/0
    
time_base=1/1000
    
start_time=0.000000
    
duration=N/A
    
bit_rate=448000
    
nb_frames=N/A
    
nb_read_frames=N/A
    
nb_read_packets=N/A
    
TAG:language=eng
    
TAG:title=English Ac3 5.1 chnls 448 kbps
    
[/STREAM]
    
[STREAM]
    
index=2
    
codec_name=ac3
    
codec_long_name=ATSC A/52A (AC-3)
    
profile=unknown
    
codec_type=audio
    
codec_time_base=1/48000
    
codec_tag_string=[0][0][0][0]
    
codec_tag=0x0000
    
sample_fmt=s16
    
sample_rate=48000
    
channels=2
    
bits_per_sample=0
    
dmix_mode=-1
    
ltrt_cmixlev=-1.000000
    
ltrt_surmixlev=-1.000000
    
loro_cmixlev=-1.000000
    
loro_surmixlev=-1.000000
    
id=N/A
    
r_frame_rate=0/0
    
avg_frame_rate=0/0
    
time_base=1/1000
    
start_time=0.000000
    
duration=N/A
    
bit_rate=224000
    
nb_frames=N/A
    
nb_read_frames=N/A
    
nb_read_packets=N/A
    
TAG:language=ita
    
TAG:title=Italian Ac3 2.0 chnls 224  kbps
    
[/STREAM]
    
[STREAM]
    
index=3
    
codec_name=unknown
    
codec_long_name=unknown
    
profile=unknown
    
codec_type=subtitle
    
codec_time_base=1/1000
    
codec_tag_string=[0][0][0][0]
    
codec_tag=0x0000
    
id=N/A
    
r_frame_rate=0/0
    
avg_frame_rate=0/0
    
time_base=1/1000
    
start_time=0.000000
    
duration=N/A
    
bit_rate=N/A
    
nb_frames=N/A
    
nb_read_frames=N/A
    
nb_read_packets=N/A
    
TAG:language=eng
    
TAG:title=english
    
[/STREAM]
    
[STREAM]
    
index=4
    
codec_name=unknown
    
codec_long_name=unknown
    
profile=unknown
    
codec_type=subtitle
    
codec_time_base=1/1000
    
codec_tag_string=[0][0][0][0]
    
codec_tag=0x0000
    
id=N/A
    
r_frame_rate=0/0
    
avg_frame_rate=0/0
    
time_base=1/1000
    
start_time=0.000000
    
duration=N/A
    
bit_rate=N/A
    
nb_frames=N/A
    
nb_read_frames=N/A
    
nb_read_packets=N/A
    
TAG:language=ita
    
TAG:title=italian
    
[/STREAM]
    
[STREAM]
    
index=5
    
codec_name=unknown
    
codec_long_name=unknown
    
profile=unknown
    
codec_type=subtitle
    
codec_time_base=1/1000
    
codec_tag_string=[0][0][0][0]
    
codec_tag=0x0000
    
id=N/A
    
r_frame_rate=0/0
    
avg_frame_rate=0/0
    
time_base=1/1000
    
start_time=0.000000
    
duration=N/A
    
bit_rate=N/A
    
nb_frames=N/A
    
nb_read_frames=N/A
    
nb_read_packets=N/A
    
TAG:language=dan
    
TAG:title=danish
    
[/STREAM]
    
[STREAM]
    
index=6
    
codec_name=unknown
    
codec_long_name=unknown
    
profile=unknown
    
codec_type=subtitle
    
codec_time_base=1/1000
    
codec_tag_string=[0][0][0][0]
    
codec_tag=0x0000
    
id=N/A
    
r_frame_rate=0/0
    
avg_frame_rate=0/0
    
time_base=1/1000
    
start_time=0.000000
    
duration=N/A
    
bit_rate=N/A
    
nb_frames=N/A
    
nb_read_frames=N/A
    
nb_read_packets=N/A
    
TAG:language=dut
    
TAG:title=dutch
    
[/STREAM]
    
[STREAM]
    
index=7
    
codec_name=unknown
    
codec_long_name=unknown
    
profile=unknown
    
codec_type=subtitle
    
codec_time_base=1/1000
    
codec_tag_string=[0][0][0][0]
    
codec_tag=0x0000
    
id=N/A
    
r_frame_rate=0/0
    
avg_frame_rate=0/0
    
time_base=1/1000
    
start_time=0.000000
    
duration=N/A
    
bit_rate=N/A
    
nb_frames=N/A
    
nb_read_frames=N/A
    
nb_read_packets=N/A
    
TAG:language=fin
    
TAG:title=finnish
    
[/STREAM]
    
[STREAM]
    
index=8
    
codec_name=unknown
    
codec_long_name=unknown
    
profile=unknown
    
codec_type=subtitle
    
codec_time_base=1/1000
    
codec_tag_string=[0][0][0][0]
    
codec_tag=0x0000
    
id=N/A
    
r_frame_rate=0/0
    
avg_frame_rate=0/0
    
time_base=1/1000
    
start_time=0.000000
    
duration=N/A
    
bit_rate=N/A
    
nb_frames=N/A
    
nb_read_frames=N/A
    
nb_read_packets=N/A
    
TAG:language=fre
    
TAG:title=french
    
[/STREAM]
    
[STREAM]
    
index=9
    
codec_name=unknown
    
codec_long_name=unknown
    
profile=unknown
    
codec_type=subtitle
    
codec_time_base=1/1000
    
codec_tag_string=[0][0][0][0]
    
codec_tag=0x0000
    
id=N/A
    
r_frame_rate=0/0
    
avg_frame_rate=0/0
    
time_base=1/1000
    
start_time=0.000000
    
duration=N/A
    
bit_rate=N/A
    
nb_frames=N/A
    
nb_read_frames=N/A
    
nb_read_packets=N/A
    
TAG:language=ger
    
TAG:title=german
    
[/STREAM]
    
[STREAM]
    
index=10
    
codec_name=unknown
    
codec_long_name=unknown
    
profile=unknown
    
codec_type=subtitle
    
codec_time_base=1/1000
    
codec_tag_string=[0][0][0][0]
    
codec_tag=0x0000
    
id=N/A
    
r_frame_rate=0/0
    
avg_frame_rate=0/0
    
time_base=1/1000
    
start_time=0.000000
    
duration=N/A
    
bit_rate=N/A
    
nb_frames=N/A
    
nb_read_frames=N/A
    
nb_read_packets=N/A
    
TAG:language=nor
    
TAG:title=norwegian
    
[/STREAM]
    
[STREAM]
    
index=11
    
codec_name=unknown
    
codec_long_name=unknown
    
profile=unknown
    
codec_type=subtitle
    
codec_time_base=1/1000
    
codec_tag_string=[0][0][0][0]
    
codec_tag=0x0000
    
id=N/A
    
r_frame_rate=0/0
    
avg_frame_rate=0/0
    
time_base=1/1000
    
start_time=0.000000
    
duration=N/A
    
bit_rate=N/A
    
nb_frames=N/A
    
nb_read_frames=N/A
    
nb_read_packets=N/A
    
TAG:language=spa
    
TAG:title=spanish
    
[/STREAM]
    
[STREAM]
    
index=12
    
codec_name=unknown
    
codec_long_name=unknown
    
profile=unknown
    
codec_type=subtitle
    
codec_time_base=1/1000
    
codec_tag_string=[0][0][0][0]
    
codec_tag=0x0000
    
id=N/A
    
r_frame_rate=0/0
    
avg_frame_rate=0/0
    
time_base=1/1000
    
start_time=0.000000
    
duration=N/A
    
bit_rate=N/A
    
nb_frames=N/A
    
nb_read_frames=N/A
    
nb_read_packets=N/A
    
TAG:language=swe
    
TAG:title=swedish
    
[/STREAM]
    
[STREAM]
    
index=13
    
codec_name=unknown
    
codec_long_name=unknown
    
profile=unknown
    
codec_type=subtitle
    
codec_time_base=1/1000
    
codec_tag_string=[0][0][0][0]
    
codec_tag=0x0000
    
id=N/A
    
r_frame_rate=0/0
    
avg_frame_rate=0/0
    
time_base=1/1000
    
start_time=0.000000
    
duration=N/A
    
bit_rate=N/A
    
nb_frames=N/A
    
nb_read_frames=N/A
    
nb_read_packets=N/A
    
TAG:language=eng
    
TAG:title=english hearig impaired
    
[/STREAM]
    
[FORMAT]
    
filename=c:\dev\content\Breakfast At Tiffany's sample preview.mkv
    
nb_streams=14
    
format_name=matroska,webm
    
format_long_name=Matroska/WebM file format
    
start_time=0.000000
    
duration=62.776000
    
size=31947628
    
bit_rate=4071317
    
TAG:creation_time=2011-12-14 21:27:01
    
[/FORMAT]

    My problem is, the process appears to hang. I took out the 'CreateNoWindow' option and, of course, I get a big blank window onscreen that normally just flashs by on a normal file. With the teletext subtitle file however, it persists. If I manually close it, the program continues and I seem to get the output I want.

    So my question is, how can I debug this further, to find out why this is hanging and how to handle the error (or simply ignore it) and continue ?

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