So I'm one step close. I get out a .mp4 file. It has the correct duration but
it is only black. The problem must be somewhere in the output format.
When I format dump i got the following for the input:
Input #0, mpegts, from 'input.ts':
Duration: 00:00:03.96, start: 576.290000, bitrate: 621 kb/s
Program 1
Stream #0.0[0x1002]: Video: h264, yuv420p, 720x576 [PAR 142:100 DAR 71:40],
50 fps, 25 tbr, 90k tbn, 50 tbc
and the following for the output:
Output #0, mp4, to
'/private/var/mobile/Applications/60B46933-02C2-4DA9-9AD7-F2F05A9574CB/tmp/-Tmp-/output.mp4':
Stream #0.0: Video: 0x001b, 720x576, q=2-31, 90k tbn, 50 tbc
Now when I compare this to the output of "./ffmpeg -i input.ts -acodec copy
-vcodec copy output.mp4" i see some strange diffs:
Output #0, mp4, to 'test_output.mp4':
Metadata:
encoder : Lavf52.64.2
Stream #0.0: Video: 0x0021, yuv420p, 720x576 [PAR 71:50 DAR 71:40], q=2-31,
50 tbn, 25 tbc
Stream mapping:
Stream #0.0 -> #0.0
-> Video: 0x0021 vs 0x001b ??? what does this mean? What am I doing wrong that
I'm getting a different output?
-> The metadata key encoder is not required right?
My AVStream setup:
for (NSValue *stream in streams) {
AVStream *avStream = [stream pointerValue];
AVStream *outputStream = av_new_stream(outputContext, avStream->id);
if (!outputStream) {
NSLog(@"Could not init new output stream");
}
memcpy(outputStream->language, avStream->language,
sizeof(avStream->language));
switch (avStream->codec->codec_type) {
case CODEC_TYPE_VIDEO:
{
avcodec_get_context_defaults2(outputStream->codec,
CODEC_TYPE_VIDEO);
outputStream->codec->codec_type = CODEC_TYPE_VIDEO;
outputStream->codec->width =
720;//avStream->codec->width;
outputStream->codec->height =
576;//avStream->codec->height;
break;
}
case CODEC_TYPE_AUDIO:
{
avcodec_get_context_defaults2(outputStream->codec,
CODEC_TYPE_AUDIO);
outputStream->codec->codec_type = CODEC_TYPE_AUDIO;
outputStream->codec->channels =
avStream->codec->channels;
outputStream->codec->sample_rate =
avStream->codec->sample_rate;
outputStream->codec->frame_size =
avStream->codec->frame_size;
outputStream->codec->block_align =
avStream->codec->block_align;
break;
}
default:
return;
}
outputStream->codec->codec_id = avStream->codec->codec_id;
outputStream->codec->codec_tag = avStream->codec->codec_tag;
outputStream->codec->bit_rate = avStream->codec->bit_rate;
outputStream->codec->extradata = avStream->codec->extradata;
outputStream->codec->extradata_size = avStream->codec->extradata_size;
if (av_q2d(avStream->codec->time_base) > av_q2d(avStream->time_base) &&
av_q2d(avStream->time_base) < 1.0/1000)
outputStream->codec->time_base = avStream->codec->time_base;
else
outputStream->codec->time_base = avStream->time_base;
}
On 14.07.2010, at 15:09, Thomas Post wrote:
> With some sample code I was able to come up with some code. But I still have
> some problems with it. When calling av_write_header I get the message: "Codec
> for stream 0 does not use global headers but container format requires global
> headers". And the file written is not playable.
> I'm using av_read_frame and av_write_frame. But as I understand it these
> methods will encode/decode my movie right? But I don't wan't that, I just
> wan't to copy the encoded data from the MPEG-TS to the mp4 container. Can
> someone please give me some advice what I'm doing wrong here ?
>
> On 14.07.2010, at 10:05, Thomas Post wrote:
>
>> Hi there,
>>
>> I'm totally new to the ffmpeg libs. So I'm a real newbie!
>> First I'd like to do soemthing like this: "ffmpeg -i input.ts -acodec copy
>> -vcodec copy output.mp4" but programmatically. So I tried to do this:
>> - open an input file with av_open_input_file
>> - read it's content with av_read_frame
>> - write the frame to the output with av_write_frame. But here the problem
>> starts. How can I get an AVFormatContext to a new .mp4 file?
>>
>> Second I'd like to do this with a series of .ts files. Multiple .ts files
>> into one .mp4 file. But I think that won't be such a problem when I got the
>> thing above working.
>>
>
> _______________________________________________
> libav-user mailing list
> [email protected]
> https://lists.mplayerhq.hu/mailman/listinfo/libav-user
>
Thomas Post
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